Adding upstream version 3.0.0.upstream/3.0.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

213 files changed, 6723 insertions, 5306 deletions

diff --git a/.flake8 b/.flake8
deleted file mode 100644
index d571285..0000000
--- a/.flake8
+++ /dev/null
@@ -1,28 +0,0 @@
-[flake8]
-max-line-length = 88
-per-file-ignores =
-    # F401:	Module imported but unused
-    # TC001: Move import into type checking block
-    __init__.py:F401, TC001
-    # F811:	Redefinition of unused name from line n
-    pendulum/tz/timezone.py:F811
-min_python_version = 3.7.0
-ban-relative-imports = true
-# flake8-use-fstring: https://github.com/MichaelKim0407/flake8-use-fstring#--percent-greedy-and---format-greedy
-format-greedy = 1
-inline-quotes = double
-enable-extensions = TC, TC1
-type-checking-exempt-modules = typing, typing-extensions
-eradicate-whitelist-extend = ^-.*;
-extend-ignore =
-    # E501:	Line too long
-    E501,
-    # E203:	Whitespace before ':'
-    E203,
-    # SIM106: Handle error-cases first
-    SIM106,
-extend-exclude =
-    # External to the project's coding standards:
-    docs/*,
-    # Machine-generated, too many false-positives
-    pendulum/locales/*,
diff --git a/.github/workflows/codspeed.yml b/.github/workflows/codspeed.yml
new file mode 100644
index 0000000..fcc7ed3
--- /dev/null
+++ b/.github/workflows/codspeed.yml
@@ -0,0 +1,52 @@
+name: codspeed
+
+on:
+  push:
+    branches:
+      - "master"
+  pull_request:
+  # `workflow_dispatch` allows CodSpeed to trigger backtest
+  # performance analysis in order to generate initial data.
+  workflow_dispatch:
+
+jobs:
+  benchmarks:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v3
+        with:
+          python-version: "3.9"
+
+      - name: Get full Python version
+        id: full-python-version
+        run: |
+          echo ::set-output name=version::$(python -c "import sys; print('-'.join(str(v) for v in sys.version_info))")
+
+      - name: Install poetry
+        run: |
+          curl -fsS https://install.python-poetry.org | python - -y
+
+      - name: Update PATH
+        if: ${{ matrix.os != 'Windows' }}
+        run: echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+      - name: Configure poetry
+        run: poetry config virtualenvs.create false
+
+      - name: Install dependencies
+        run: poetry install --only test --only benchmark --only build -vvv --no-root
+
+      - name: Install project
+        run: poetry install --only test --only benchmark --only build -vvv --no-root
+
+      - name: Install pendulum and check extensions
+        run: |
+          poetry run pip install -e . -vvv
+          python -c 'import pendulum._pendulum'
+
+      - name: Run benchmarks
+        uses: CodSpeedHQ/action@v1
+        with:
+          token: ${{ secrets.CODSPEED_TOKEN }}
+          run: pytest tests/ --codspeed
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 59062ae..5821407 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -4,34 +4,103 @@ on:
   push:
     tags:
       - '*.*.*'
+  workflow_dispatch:
 
 jobs:
-
   build:
-    name: Build wheels on ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}-latest
+    name: Build on ${{ matrix.platform || matrix.os }} (${{ matrix.target }} - ${{ matrix.manylinux || 'auto' }})
     strategy:
+      fail-fast: false
       matrix:
-        os: [ ubuntu, windows, macos ]
+        os: [ubuntu, macos, windows]
+        target: [x86_64, aarch64]
+        manylinux: [auto]
+        include:
+          - os: ubuntu
+            platform: linux
+          - os: windows
+            ls: dir
+            interpreter: 3.7 3.8 3.9 3.10 3.11 3.12 pypy3.8 pypy3.9 pypy3.10
+          - os: windows
+            ls: dir
+            target: aarch64
+            interpreter: 3.11 3.12
+          - os: macos
+            target: aarch64
+            interpreter: 3.7 3.8 3.9 3.10 3.11 3.12 pypy3.8 pypy3.9 pypy3.10
+          - os: ubuntu
+            platform: linux
+            target: aarch64
+            # mimalloc not supported on manylinux2014 cross-compile container
+            extra-build-args: --no-default-features
+          # musllinux
+          - os: ubuntu
+            platform: linux
+            target: x86_64
+            manylinux: musllinux_1_1
+          - os: ubuntu
+            platform: linux
+            target: aarch64
+            manylinux: musllinux_1_1
+          - os: ubuntu
+            platform: linux
+            target: ppc64le
+            interpreter: 3.7 3.8 3.9 3.10 3.11 3.12
+            # mimalloc not supported on manylinux2014 cross-compile container
+            extra-build-args: --no-default-features
+          - os: ubuntu
+            platform: linux
+            target: s390x
+            interpreter: 3.7 3.8 3.9 3.10 3.11 3.12
+            # mimalloc not supported on manylinux2014 cross-compile container
+            extra-build-args: --no-default-features
 
+    runs-on: ${{ matrix.os }}-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
-      - name: Build wheels
-        uses: pypa/cibuildwheel@v2.10.1
-        env:
-          CIBW_PROJECT_REQUIRES_PYTHON: ">=3.7"
+      - name: set up python
+        uses: actions/setup-python@v4
         with:
-          package-dir: .
-          output-dir: dist
+          python-version: '3.11'
+          architecture: ${{ matrix.python-architecture || 'x64' }}
+
+      - name: build wheels
+        uses: PyO3/maturin-action@v1
+        with:
+          target: ${{ matrix.target }}
+          manylinux: ${{ matrix.manylinux || 'auto' }}
+          container: ${{ matrix.container }}
+          args: --release --out dist --interpreter ${{ matrix.interpreter || '3.7 3.8 3.9 3.10 3.11 3.12 pypy3.7 pypy3.8 pypy3.9 pypy3.10' }} ${{ matrix.extra-build-args }}
+          rust-toolchain: stable
+          docker-options: -e CI
+
+      - run: ${{ matrix.ls || 'ls -lh' }} dist/
 
       - uses: actions/upload-artifact@v3
         with:
           name: dist
-          path: ./dist/*
+          path: dist
+
+  build_sdist:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Build sdist
+        uses: PyO3/maturin-action@v1
+        with:
+          command: sdist
+          args: --out dist
+      - name: Upload sdist
+        uses: actions/upload-artifact@v3
+        with:
+          name: dist
+          path: dist
+
 
   Release:
-    needs: [ build ]
+    needs: [ build, build_sdist ]
+    if: success() && startsWith(github.ref, 'refs/tags/')
     runs-on: ubuntu-latest
 
     steps:
@@ -51,9 +120,6 @@ jobs:
       - name: Update PATH
         run: echo "$HOME/.local/bin" >> $GITHUB_PATH
 
-      - name: Build sdist
-        run: poetry build --format sdist
-
       - name: Check distributions
         run: |
           ls -la dist
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 341859e..077a9c7 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -13,13 +13,27 @@ on:
       - '**'
 
 jobs:
+  Linting:
+    name: Linting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+      - name: "Install pre-commit"
+        run: pip install pre-commit
+      - name: "Install Rust toolchain"
+        run: rustup component add rustfmt clippy
+      - run: pre-commit run --all-files
+
   Tests:
     name: ${{ matrix.os }} / ${{ matrix.python-version }}
     runs-on: ${{ matrix.os }}-latest
     strategy:
       matrix:
         os: [Ubuntu, MacOS, Windows]
-        python-version: [3.7, 3.8, 3.9, "3.10"]
+        python-version: [3.8, 3.9, "3.10", "3.11", "3.12"]
     defaults:
       run:
         shell: bash
@@ -31,6 +45,7 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
 
       - name: Get full Python version
         id: full-python-version
@@ -64,8 +79,18 @@ jobs:
         if: steps.cache.outputs.cache-hit == 'true' && matrix.os != 'MacOS'
         run: timeout 10s poetry run pip --version || rm -rf .venv
 
-      - name: Install dependencies
-        run: poetry install --only main --only test -vvv
+      - name: Install runtime, testing, and typing dependencies
+        run: poetry install --only main --only test --only typing --only build --no-root -vvv
+
+      - name: Install project
+        run: poetry run maturin develop
+
+      - name: Run type checking
+        run: poetry run mypy
+
+      - name: Uninstall typing dependencies
+        # This ensures pendulum runs without typing_extensions installed
+        run: poetry install --only main --only test --only build --sync --no-root -vvv
 
       - name: Test Pure Python
         run: |
diff --git a/.gitignore b/.gitignore
index bb25f8b..dd3696f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,3 +35,5 @@ setup.py
 # editor
 
 .vscode
+/target
+/rust/target
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 0e8d094..3ec3be2 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -3,7 +3,7 @@ ci:
 
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.3.0
+    rev: v4.4.0
     hooks:
       - id: trailing-whitespace
         exclude: ^tests/.*/fixtures/.*
@@ -11,61 +11,21 @@ repos:
         exclude: ^tests/.*/fixtures/.*
       - id: debug-statements
 
-  - repo: https://github.com/hadialqattan/pycln
-    rev: v2.1.1
-    hooks:
-      - id: pycln
-        args: [ --all ]
-
   - repo: https://github.com/psf/black
-    rev: 22.10.0
+    rev: 23.7.0
     hooks:
       - id: black
 
-  - repo: https://github.com/pycqa/isort
-    rev: 5.10.1
-    hooks:
-      - id: isort
-        args: [ --add-import, from __future__ import annotations, --lines-after-imports, "-1" ]
-
-  - repo: https://github.com/pycqa/flake8
-    rev: 5.0.4
-    hooks:
-      - id: flake8
-        additional_dependencies: &flake8_deps
-          - flake8-broken-line==0.5.0
-          - flake8-bugbear==22.7.1
-          - flake8-comprehensions==3.10.0
-          - flake8-eradicate==1.3.0
-          - flake8-quotes==3.3.1
-          - flake8-simplify==0.19.2
-          - flake8-tidy-imports==4.8.0
-          - flake8-type-checking==2.1.2
-          - flake8-typing-imports==1.12.0
-          - flake8-use-fstring==1.3
-          - pep8-naming==0.13.1
-
-  - repo: https://github.com/asottile/yesqa
-    rev: v1.4.0
-    hooks:
-      - id: yesqa
-        additional_dependencies: *flake8_deps
-
-  - repo: https://github.com/asottile/pyupgrade
-    rev: v3.2.0
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.0.291
     hooks:
-      - id: pyupgrade
-        exclude: ^build\.py$
-        args:
-          - --py37-plus
+    -   id: ruff
 
-  - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.982
+  - repo: local
     hooks:
-      - id: mypy
+      - id: lint-rust
+        name: Lint Rust
+        entry: make lint-rust
+        types: [rust]
+        language: rust
         pass_filenames: false
-        exclude: ^build\.py$
-        additional_dependencies:
-          - pytest>=7.1.2
-          - types-backports
-          - types-python-dateutil
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ae71991..4c90eff 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,40 @@
 # Change Log
 
+## [3.0.0] - 2023-12-16
+
+### Changed
+
+- Relaxed dependency constraints. [#760](https://github.com/sdispater/pendulum/pull/760)
+- The testing helpers are now  optional and must be opted-in via the `test` extra. [#778](https://github.com/sdispater/pendulum/pull/778)
+
+### Fixed
+
+- Removed remaining mentions of periods instead of intervals. [#757](https://github.com/sdispater/pendulum/pull/757)
+- Fixed the behavior of the `week_of_month` property for edge cases in January and December. [#774](https://github.com/sdispater/pendulum/pull/774)
+- Fixed the handling of the `fold` attribute when deep-copying a `DateTime` instance. [#776](https://github.com/sdispater/pendulum/pull/776)
+- Fixed errors where hours and days were not handled properly when adding durations. [#775](https://github.com/sdispater/pendulum/pull/775)
+- Fixed errors where hours and days were not handled properly when adding durations. [#775](https://github.com/sdispater/pendulum/pull/775)
+
+
+## [3.0.0b1] - 2023-10-01
+
+### Added
+
+- Made `instance()` support all native types (date, time, datetime). [#732](https://github.com/sdispater/pendulum/pull/732)
+
+### Changed
+
+- Dropped support for Python 3.7. [#734](https://github.com/sdispater/pendulum/pull/734)
+- Rewrote extensions in Rust. [#721](https://github.com/sdispater/pendulum/pull/721)
+- Made day of week convention more consistent across the codebase. [#731](https://github.com/sdispater/pendulum/pull/731)
+
+### Fixed
+
+- Fixed datetime string representation to match the native library. [#733](https://github.com/sdispater/pendulum/pull/733)
+- Fixed issues on some system when retrieving the local timezone. [#733](https://github.com/sdispater/pendulum/pull/733)
+- Fixed DST handling in `start_of()/end_of()` methods. [#713](https://github.com/sdispater/pendulum/pull/713)
+
+
 ## [3.0.0a1] - 2022-11-23
 
 ### Added
@@ -165,7 +200,9 @@
 
 
 
-[Unreleased]: https://github.com/sdispater/pendulum/compare/3.0.0a1...master
+[Unreleased]: https://github.com/sdispater/pendulum/compare/3.0.0...master
+[3.0.0]: https://github.com/sdispater/pendulum/releases/tag/3.0.0
+[3.0.0b1]: https://github.com/sdispater/pendulum/releases/tag/3.0.0b1
 [3.0.0a1]: https://github.com/sdispater/pendulum/releases/tag/3.0.0a1
 [2.1.1]: https://github.com/sdispater/pendulum/releases/tag/2.1.1
 [2.1.0]: https://github.com/sdispater/pendulum/releases/tag/2.1.0
diff --git a/Makefile b/Makefile
index e68b94c..d6626b5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,3 @@
-# This file is part of orator
-# https://github.com/sdispater/orator
-
-# Licensed under the MIT license:
-# http://www.opensource.org/licenses/MIT-license
-# Copyright (c) 2015 Sébastien Eustace
-
-PENDULUM_RELEASE := $$(sed -n -E "s/VERSION = \"(.+)\"/\1/p" pendulum/version.py)
 
 # lists all available targets
 list:
@@ -16,38 +8,11 @@ list:
 # required for list
 no_targets__:
 
-# install all dependencies
-setup: setup-python
-
-# test your application (tests in the tests/ directory)
-test:
-	@py.test --cov=pendulum --cov-config .coveragerc tests/ -sq
-
-linux_release: wheels_x64 wheels_i686
-
-release: wheels_x64 wheels_i686 wheel
-
-publish:
-	@poetry publish --no-build
-
-tar:
-	python setup.py sdist --formats=gztar
-
-wheel:
-	@poetry build -v
-
-wheels_x64: build_wheels_x64
-
-wheels_i686: build_wheels_i686
-
-build_wheels_x64:
-	docker pull quay.io/pypa/manylinux1_x86_64
-	docker run --rm -v `pwd`:/io quay.io/pypa/manylinux1_x86_64 /io/build-wheels.sh
+lint-rust:
+	cd rust && cargo fmt --all -- --check
+	cd rust && cargo clippy --tests -- -D warnings
 
-build_wheels_i686:
-	docker pull quay.io/pypa/manylinux1_i686
-	docker run --rm -v `pwd`:/io quay.io/pypa/manylinux1_i686 /io/build-wheels.sh
 
-# run tests against all supported python versions
-tox:
-	@tox
+format-rust:
+	cd rust && cargo fmt --all
+	cd rust && cargo clippy --tests --fix --allow-dirty -- -D warnings
diff --git a/README.rst b/README.rst
index 78437e2..65a0ad6 100644
--- a/README.rst
+++ b/README.rst
@@ -7,9 +7,6 @@ Pendulum
 .. image:: https://img.shields.io/pypi/l/pendulum.svg
     :target: https://pypi.python.org/pypi/pendulum
 
-.. image:: https://img.shields.io/codecov/c/github/sdispater/pendulum/master.svg
-    :target: https://codecov.io/gh/sdispater/pendulum/branch/master
-
 .. image:: https://github.com/sdispater/pendulum/actions/workflows/tests.yml/badge.svg
     :alt: Pendulum Build status
     :target: https://github.com/sdispater/pendulum/actions
@@ -17,7 +14,7 @@ Pendulum
 
 Python datetimes made easy.
 
-Supports Python **2.7** and **3.4+**.
+Supports Python **3.8 and newer**.
 
 
 .. code-block:: python
@@ -56,6 +53,13 @@ Supports Python **2.7** and **3.4+**.
    '2013-03-31T03:00:00+02:00'
 
 
+Resources
+=========
+
+* `Official Website <https://pendulum.eustace.io>`_
+* `Documentation <https://pendulum.eustace.io/docs/>`_
+* `Issue Tracker <https://github.com/sdispater/pendulum/issues>`_
+
 Why Pendulum?
 =============
 
@@ -66,7 +70,7 @@ So it's still ``datetime`` but better.
 
 Unlike other datetime libraries for Python, Pendulum is a drop-in replacement
 for the standard ``datetime`` class (it inherits from it), so, basically, you can replace all your ``datetime``
-instances by ``DateTime`` instances in you code (exceptions exist for libraries that check
+instances by ``DateTime`` instances in your code (exceptions exist for libraries that check
 the type of the objects by using the ``type`` function like ``sqlite3`` or ``PyMySQL`` for instance).
 
 It also removes the notion of naive datetimes: each ``Pendulum`` instance is timezone-aware
@@ -121,14 +125,6 @@ a possible solution, if any:
             return '' if val is None else val.isoformat()
 
 
-Resources
-=========
-
-* `Official Website <https://pendulum.eustace.io>`_
-* `Documentation <https://pendulum.eustace.io/docs/>`_
-* `Issue Tracker <https://github.com/sdispater/pendulum/issues>`_
-
-
 Contributing
 ============
 
diff --git a/build-wheels.sh b/build-wheels.sh
deleted file mode 100755
index 1c8f1cb..0000000
--- a/build-wheels.sh
+++ /dev/null
@@ -1,27 +0,0 @@
-#!/bin/bash
-set -e -x
-
-cd $(dirname $0)
-
-export PATH=/opt/python/cp38-cp38/bin/:$PATH
-
-curl -fsS -o get-poetry.py https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py
-/opt/python/cp38-cp38/bin/python get-poetry.py --preview -y
-rm get-poetry.py
-
-for PYBIN in /opt/python/cp3*/bin; do
-  if [ "$PYBIN" == "/opt/python/cp34-cp34m/bin" ]; then
-    continue
-  fi
-  if [ "$PYBIN" == "/opt/python/cp35-cp35m/bin" ]; then
-    continue
-  fi
-  rm -rf build
-  "${PYBIN}/python" $HOME/.poetry/bin/poetry build -vvv
-done
-
-cd dist
-for whl in *.whl; do
-    auditwheel repair "$whl"
-    rm "$whl"
-done
diff --git a/build.py b/build.py
deleted file mode 100644
index 95e63e1..0000000
--- a/build.py
+++ /dev/null
@@ -1,33 +0,0 @@
-import subprocess
-
-from pathlib import Path
-
-
-def meson(*args):
-    subprocess.call(["meson"] + list(args))
-
-
-def _build():
-    build_dir = Path(__file__).parent.joinpath("build")
-    build_dir.mkdir(parents=True, exist_ok=True)
-
-    meson("setup", build_dir.as_posix())
-    meson("compile", "-C", build_dir.as_posix())
-    meson("install", "-C", build_dir.as_posix())
-
-
-def build(setup_kwargs):
-    """
-    This function is mandatory in order to build the extensions.
-    """
-    try:
-        _build()
-    except Exception:
-        print(
-            "  Unable to build C extensions, "
-            "Pendulum will use the pure python version of the extensions."
-        )
-
-
-if __name__ == "__main__":
-    build({})
diff --git a/clock b/clock
index 17f35a3..acd8c55 100755
--- a/clock
+++ b/clock
@@ -47,7 +47,6 @@ class _LambdaCompiler(_GettextCompiler):
 
 
 class LocaleCreate(Command):
-
     name = "locale create"
     description = "Creates locale translations."
 
@@ -113,8 +112,8 @@ translations = {{}}
             data["days"] = {}
             for fmt, names in days.items():
                 data["days"][fmt] = {}
-                for value, name in names.items():
-                    data["days"][fmt][(value + 1) % 7] = name
+                for value, name in sorted(names.items()):
+                    data["days"][fmt][value] = name
 
             # Getting months names
             months = content["months"]["format"]
@@ -159,6 +158,9 @@ translations = {{}}
             # Day periods
             data["day_periods"] = content["day_periods"]["format"]["wide"]
 
+            # Week data
+            data["week_data"] = content["week_data"]
+
             result = self.TEMPLATE.format(
                 locale=locale,
                 plural=plural,
@@ -229,7 +231,6 @@ translations = {{}}
 
 
 class LocaleRecreate(Command):
-
     name = "locale recreate"
     description = "Recreate existing locales."
 
@@ -240,11 +241,10 @@ class LocaleRecreate(Command):
         locales = glob.glob(os.path.join(locales_dir, "*", "locale.py"))
         locales = [os.path.basename(os.path.dirname(locale)) for locale in locales]
 
-        self.call("locale:create", [("locales", locales)])
+        self.call("locale create", "locales " + " ".join(locales))
 
 
 class WindowsTzDump(Command):
-
     name = "windows dump-timezones"
     description = "Dumps the mapping of Windows timezones to IANA timezones."
 
diff --git a/codecov.yml b/codecov.yml
deleted file mode 100644
index 3cbba28..0000000
--- a/codecov.yml
+++ /dev/null
@@ -1,7 +0,0 @@
-comment: false
-
-coverage:
-  status:
-    patch:
-      default:
-        enabled: false
diff --git a/docs/docs/difference.md b/docs/docs/difference.md
index 3a7f063..2653f01 100644
--- a/docs/docs/difference.md
+++ b/docs/docs/difference.md
@@ -1,6 +1,6 @@
 # Difference
 
-The `diff()` method returns a [Period](#period) instance that represents the total duration
+The `diff()` method returns an [Interval](#interval) instance that represents the total duration
 between two `DateTime` instances. This interval can be then expressed in various units.
 These interval methods always return *the total difference expressed* in the specified time requested.
 All values are truncated and not rounded.
diff --git a/docs/docs/index.md b/docs/docs/index.md
index daca205..107e043 100644
--- a/docs/docs/index.md
+++ b/docs/docs/index.md
@@ -12,6 +12,6 @@
 {!docs/modifiers.md!}
 {!docs/timezones.md!}
 {!docs/duration.md!}
-{!docs/period.md!}
+{!docs/interval.md!}
 {!docs/testing.md!}
 {!docs/limitations.md!}
diff --git a/docs/docs/installation.md b/docs/docs/installation.md
index bfa9641..9f80e87 100644
--- a/docs/docs/installation.md
+++ b/docs/docs/installation.md
@@ -11,3 +11,23 @@ or, if you are using [poetry](https://python-poetry.org):
 ```bash
 $ poetry add pendulum
 ```
+
+## Optional features
+
+Pendulum provides optional features that you must explicitly require in order to use them.
+
+These optional features are:
+
+- `test`: Provides a set of helpers to make testing easier by allowing you to control the flow of time.
+
+You can install them by specifying them when installing Pendulum
+
+```bash
+$ pip install pendulum[test]
+```
+
+or, if you are using [poetry](https://python-poetry.org):
+
+```bash
+$ poetry add pendulum[test]
+```
diff --git a/docs/docs/period.md b/docs/docs/interval.md
index a4dde16..fc70fb3 100644
--- a/docs/docs/period.md
+++ b/docs/docs/interval.md
@@ -1,6 +1,6 @@
-# Period
+# Interval
 
-When you subtract a `DateTime` instance from another, or use the `diff()` method, it will return a `Period` instance.
+When you subtract a `DateTime` instance from another, or use the `diff()` method, it will return an `Interval` instance.
 It inherits from the [Duration](#duration) class with the added benefit that it is aware of the
 instances that generated it, so that it can give access to more methods and properties:
 
@@ -10,29 +10,29 @@ instances that generated it, so that it can give access to more methods and prop
 >>> start = pendulum.datetime(2000, 11, 20)
 >>> end = pendulum.datetime(2016, 11, 5)
 
->>> period = end - start
+>>> interval = end - start
 
->>> period.years
+>>> interval.years
 15
->>> period.months
+>>> interval.months
 11
->>> period.in_years()
+>>> interval.in_years()
 15
->>> period.in_months()
+>>> interval.in_months()
 191
 
 # Note that the weeks property
 # will change compared to the Duration class
->>> period.weeks
+>>> interval.weeks
 2 # 832 for the duration
 
 # However the days property will still remain the same
 # to keep the compatibility with the timedelta class
->>> period.days
+>>> interval.days
 5829
 ```
 
-Be aware that a period, just like an interval, is compatible with the `timedelta` class regarding
+Be aware that an interval, just like an duration, is compatible with the `timedelta` class regarding
 its attributes. However, its custom attributes (like `remaining_days`) will be aware of any DST
 transitions that might have occurred and adjust accordingly. Let's take an example:
 
@@ -42,42 +42,42 @@ transitions that might have occurred and adjust accordingly. Let's take an examp
 >>> start = pendulum.datetime(2017, 3, 7, tz='America/Toronto')
 >>> end = start.add(days=6)
 
->>> period = end - start
+>>> interval = end - start
 
 # timedelta properties
->>> period.days
+>>> interval.days
 5
->>> period.seconds
+>>> interval.seconds
 82800
 
-# period properties
->>> period.remaining_days
+# interval properties
+>>> interval.remaining_days
 6
->>> period.hours
+>>> interval.hours
 0
->>> period.remaining_seconds
+>>> interval.remaining_seconds
 0
 ```
 
 !!!warning
 
     Due to their nature (fixed duration between two datetimes), most arithmetic operations will
-    return a `Duration` instead of a `Period`.
+    return a `Duration` instead of an `Interval`.
 
     ```python
     >>> import pendulum
 
     >>> dt1 = pendulum.datetime(2016, 8, 7, 12, 34, 56)
     >>> dt2 = dt1.add(days=6, seconds=34)
-    >>> period = pendulum.period(dt1, dt2)
-    >>> period * 2
+    >>> interval = pendulum.interval(dt1, dt2)
+    >>> interval * 2
     Duration(weeks=1, days=5, minutes=1, seconds=8)
     ```
 
 
 ## Instantiation
 
-You can create an instance by using the `period()` helper:
+You can create an instance by using the `interval()` helper:
 
 ```python
 
@@ -86,29 +86,29 @@ You can create an instance by using the `period()` helper:
 >>> start = pendulum.datetime(2000, 1, 1)
 >>> end = pendulum.datetime(2000, 1, 31)
 
->>> period = pendulum.period(start, end)
+>>> interval = pendulum.interval(start, end)
 ```
 
-You can also make an inverted period:
+You can also make an inverted interval:
 
 ```python
->>> period = pendulum.period(end, start)
->>> period.remaining_days
+>>> interval = pendulum.interval(end, start)
+>>> interval.remaining_days
 -2
 ```
 
-If you have inverted dates but want to make sure that the period is positive,
+If you have inverted dates but want to make sure that the interval is positive,
 you should set the `absolute` keyword argument to `True`:
 
 ```python
->>> period = pendulum.period(end, start, absolute=True)
->>> period.remaining_days
+>>> interval = pendulum.interval(end, start, absolute=True)
+>>> interval.remaining_days
 2
 ```
 
 ## Range
 
-If you want to iterate over a period, you can use the `range()` method:
+If you want to iterate over a interval, you can use the `range()` method:
 
 ```python
 >>> import pendulum
@@ -116,9 +116,9 @@ If you want to iterate over a period, you can use the `range()` method:
 >>> start = pendulum.datetime(2000, 1, 1)
 >>> end = pendulum.datetime(2000, 1, 10)
 
->>> period = pendulum.period(start, end)
+>>> interval = pendulum.interval(start, end)
 
->>> for dt in period.range('days'):
+>>> for dt in interval.range('days'):
 >>>     print(dt)
 
 '2000-01-01T00:00:00+00:00'
@@ -141,7 +141,7 @@ If you want to iterate over a period, you can use the `range()` method:
 You can pass an amount for the passed unit to control the length of the gap:
 
 ```python
->>> for dt in period.range('days', 2):
+>>> for dt in interval.range('days', 2):
 >>>     print(dt)
 
 '2000-01-01T00:00:00+00:00'
@@ -151,18 +151,18 @@ You can pass an amount for the passed unit to control the length of the gap:
 '2000-01-09T00:00:00+00:00'
 ```
 
-You can also directly iterate over the `Period` instance,
+You can also directly iterate over the `Interval` instance,
 the unit will be `days` in this case:
 
 ```python
->>> for dt in period:
+>>> for dt in interval:
 >>>     print(dt)
 ```
 
-You can check if a `DateTime` instance is inside a period using the `in` keyword:
+You can check if a `DateTime` instance is inside a interval using the `in` keyword:
 
 ```python
 >>> dt = pendulum.datetime(2000, 1, 4)
->>> dt in period
+>>> dt in interval
 True
 ```
diff --git a/docs/docs/introduction.md b/docs/docs/introduction.md
index fbbab97..0078b48 100644
--- a/docs/docs/introduction.md
+++ b/docs/docs/introduction.md
@@ -18,4 +18,4 @@ For example, all comparisons are done in `UTC` or in the timezone of the datetim
 3
 ```
 
-The default timezone, except when using the `now()`, method will always be `UTC`.
+The default timezone, except when using the `now()` method, will always be `UTC`.
diff --git a/docs/docs/limitations.md b/docs/docs/limitations.md
index 7deff23..913aca1 100644
--- a/docs/docs/limitations.md
+++ b/docs/docs/limitations.md
@@ -4,7 +4,7 @@ Even though the `DateTime` class is a subclass of `datetime`,
 there are some rare cases where it can't replace the native class directly.
 Here is a list (non-exhaustive) of the reported cases with a possible solution, if any:
 
-* `sqlite3` will use the the `type()` function to determine the type of the object by default. To work around it you can register a new adapter:
+* `sqlite3` will use the `type()` function to determine the type of the object by default. To work around it you can register a new adapter:
 
     ```python
     import pendulum
@@ -13,7 +13,7 @@ Here is a list (non-exhaustive) of the reported cases with a possible solution,
     register_adapter(pendulum.DateTime, lambda val: val.isoformat(' '))
     ```
 
-* `mysqlclient` (former `MySQLdb`) and `PyMySQL` will use the the `type()` function to determine the type of the object by default. To work around it you can register a new adapter:
+* `mysqlclient` (former `MySQLdb`) and `PyMySQL` will use the `type()` function to determine the type of the object by default. To work around it you can register a new adapter:
 
     ```python
     import pendulum
diff --git a/docs/docs/testing.md b/docs/docs/testing.md
index dfca054..25aad8d 100644
--- a/docs/docs/testing.md
+++ b/docs/docs/testing.md
@@ -1,59 +1,87 @@
 # Testing
 
-The testing methods allow you to set a `DateTime` instance (real or mock) to be returned
-when a "now" instance is created.
-The provided instance will be returned specifically under the following conditions:
+Pendulum provides a few helpers to help you control the flow of time in your tests. Note that
+these helpers are only available if you opted in the `test` extra during [installation](#installation).
 
-* A call to the `now()` method, ex. `pendulum.now()`.
-* When the string "now" is passed to the `parse()` method, ex. `pendulum.parse('now')`
+!!!warning
+    If you are migrating from Pendulum 2, note that the `set_test_now()` and `test()`
+    helpers have been removed.
+
+
+## Relative time travel
+
+You can travel in time relatively to the current time
 
 ```python
 >>> import pendulum
 
-# Create testing datetime
->>> known = pendulum.datetime(2001, 5, 21, 12)
+>>> now = pendulum.now()
+>>> pendulum.travel(minutes=5)
+>>> pendulum.now().diff_for_humans(now)
+"5 minutes after"
+```
 
-# Set the mock
->>> pendulum.set_test_now(known)
+Note that once you've travelled in time the clock **keeps ticking**. If you prefer to stop the time completely
+you can use the `freeze` parameter:
 
->>> print(pendulum.now())
-'2001-05-21T12:00:00+00:00'
+```python
+>>> import pendulum
 
->>> print(pendulum.parse('now'))
-'2001-05-21T12:00:00+00:00'
+>>> now = pendulum.now()
+>>> pendulum.travel(minutes=5, freeze=True)
+>>> pendulum.now().diff_for_humans(now)
+"5 minutes after"  # This will stay like this indefinitely
+```
 
-# Clear the mock
->>> pendulum.set_test_now()
 
->>> print(pendulum.now())
-'2016-07-10T22:10:33.954851-05:00'
-```
+## Absolute time travel
 
-Related methods will also return values mocked according to the **now** instance.
+Sometimes, you may want to place yourself at a specific point in time.
+This is possible by using the `travel_to()` helper. This helper accepts a `DateTime` instance
+that represents the point in time where you want to travel to.
 
 ```python
->>> print(pendulum.today())
-'2001-05-21T00:00:00+00:00'
+>>> import pendulum
 
->>> print(pendulum.tomorrow())
-'2001-05-22T00:00:00+00:00'
+>>> pendulum.travel_to(pendulum.yesterday())
+```
 
->>> print(pendulum.yesterday())
-'2001-05-20T00:00:00+00:00'
+Similarly to `travel`, it's important to remember that, by default, the time keeps ticking so, if you prefer
+stopping the time, use the `freeze` parameter:
+
+```python
+>>> import pendulum
+
+>>> pendulum.travel_to(pendulum.yesterday(), freeze=True)
 ```
 
-If you don't want to manually clear the mock (or you are afraid of forgetting),
-you can use the provided `test()` contextmanager.
+## Travelling back to the present
+
+Using any of the travel helpers will keep you in the past, or future, until you decide
+to travel back to the present time. To do so, you may use the `travel_back()` helper.
 
 ```python
 >>> import pendulum
 
->>> known = pendulum.datetime(2001, 5, 21, 12)
+>>> now = pendulum.now()
+>>> pendulum.travel(minutes=5, freeze=True)
+>>> pendulum.now().diff_for_humans(now)
+"5 minutes after"
+>>> pendulum.travel_back()
+>>> pendulum.now().diff_for_humans(now)
+"a few seconds after"
+```
+
+However, it might be cumbersome to remember to travel back so, instead, you can use any of the helpers as a context
+manager:
 
->>> with pendulum.test(known):
->>>     print(pendulum.now())
-'2001-05-21T12:00:00+00:00'
+```python
+>>> import pendulum
 
->>> print(pendulum.now())
-'2016-07-10T22:10:33.954851-05:00'
+>>> now = pendulum.now()
+>>> with pendulum.travel(minutes=5, freeze=True):
+>>>     pendulum.now().diff_for_humans(now)
+"5 minutes after"
+>>> pendulum.now().diff_for_humans(now)
+"a few seconds after"
 ```
diff --git a/docs/docs/timezones.md b/docs/docs/timezones.md
index 85ff147..e70034e 100644
--- a/docs/docs/timezones.md
+++ b/docs/docs/timezones.md
@@ -67,7 +67,7 @@ adopt the proper behavior and apply the transition accordingly.
 >>> dt = dt.add(microseconds=1)
 '2013-03-31T03:00:00+02:00'
 >>> dt.subtract(microseconds=1)
-'2013-03-31T01:59:59.999998+01:00'
+'2013-03-31T01:59:59.999999+01:00'
 
 >>> dt = pendulum.datetime(2013, 10, 27, 2, 59, 59, 999999,
                            tz='Europe/Paris',
diff --git a/meson.build b/meson.build
deleted file mode 100644
index 666c281..0000000
--- a/meson.build
+++ /dev/null
@@ -1,20 +0,0 @@
-project('pendulum C extensions', 'c')
-
-py_mod = import('python')
-py = py_mod.find_installation()
-py_dep = py.dependency()
-
-extensions = [
-  ['_helpers', 'pendulum/_extensions/_helpers.c', meson.source_root() / 'pendulum/_extensions/'],
-  ['_iso8601', 'pendulum/parsing/_iso8601.c', meson.source_root() / 'pendulum/parsing/'],
-]
-
-foreach extension : extensions
-  py.extension_module(
-    extension[0],
-    extension[1],
-    dependencies : py_dep,
-    install : true,
-    install_dir: extension[2]
-  )
-endforeach
diff --git a/pendulum/__version__.py b/pendulum/__version__.py
deleted file mode 100644
index 29e86a8..0000000
--- a/pendulum/__version__.py
+++ /dev/null
@@ -1 +0,0 @@
-__version__ = "3.0.0a"
diff --git a/pendulum/_extensions/_helpers.c b/pendulum/_extensions/_helpers.c
deleted file mode 100644
index a3114d9..0000000
--- a/pendulum/_extensions/_helpers.c
+++ /dev/null
@@ -1,931 +0,0 @@
-/* ------------------------------------------------------------------------- */
-
-#include <Python.h>
-#include <datetime.h>
-#include <structmember.h>
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-
-/* ------------------------------------------------------------------------- */
-
-#define EPOCH_YEAR 1970
-
-#define DAYS_PER_N_YEAR 365
-#define DAYS_PER_L_YEAR 366
-
-#define USECS_PER_SEC 1000000
-
-#define SECS_PER_MIN 60
-#define SECS_PER_HOUR (60 * SECS_PER_MIN)
-#define SECS_PER_DAY (SECS_PER_HOUR * 24)
-
-// 400-year chunks always have 146097 days (20871 weeks).
-#define DAYS_PER_400_YEARS 146097L
-#define SECS_PER_400_YEARS ((int64_t)DAYS_PER_400_YEARS * (int64_t)SECS_PER_DAY)
-
-// The number of seconds in an aligned 100-year chunk, for those that
-// do not begin with a leap year and those that do respectively.
-const int64_t SECS_PER_100_YEARS[2] = {
-    (uint64_t)(76L * DAYS_PER_N_YEAR + 24L * DAYS_PER_L_YEAR) * SECS_PER_DAY,
-    (uint64_t)(75L * DAYS_PER_N_YEAR + 25L * DAYS_PER_L_YEAR) * SECS_PER_DAY};
-
-// The number of seconds in an aligned 4-year chunk, for those that
-// do not begin with a leap year and those that do respectively.
-const int32_t SECS_PER_4_YEARS[2] = {
-    (4 * DAYS_PER_N_YEAR + 0 * DAYS_PER_L_YEAR) * SECS_PER_DAY,
-    (3 * DAYS_PER_N_YEAR + 1 * DAYS_PER_L_YEAR) * SECS_PER_DAY};
-
-// The number of seconds in non-leap and leap years respectively.
-const int32_t SECS_PER_YEAR[2] = {
-    DAYS_PER_N_YEAR * SECS_PER_DAY,
-    DAYS_PER_L_YEAR *SECS_PER_DAY};
-
-#define MONTHS_PER_YEAR 12
-
-// The month lengths in non-leap and leap years respectively.
-const int32_t DAYS_PER_MONTHS[2][13] = {
-    {-1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
-    {-1, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}};
-
-// The day offsets of the beginning of each (1-based) month in non-leap
-// and leap years respectively.
-// For example, in a leap year there are 335 days before December.
-const int32_t MONTHS_OFFSETS[2][14] = {
-    {-1, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
-    {-1, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}};
-
-const int DAY_OF_WEEK_TABLE[12] = {
-    0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4};
-
-#define TM_SUNDAY 0
-#define TM_MONDAY 1
-#define TM_TUESDAY 2
-#define TM_WEDNESDAY 3
-#define TM_THURSDAY 4
-#define TM_FRIDAY 5
-#define TM_SATURDAY 6
-
-#define TM_JANUARY 0
-#define TM_FEBRUARY 1
-#define TM_MARCH 2
-#define TM_APRIL 3
-#define TM_MAY 4
-#define TM_JUNE 5
-#define TM_JULY 6
-#define TM_AUGUST 7
-#define TM_SEPTEMBER 8
-#define TM_OCTOBER 9
-#define TM_NOVEMBER 10
-#define TM_DECEMBER 11
-
-/* ------------------------------------------------------------------------- */
-
-int _p(int y)
-{
-    return y + y / 4 - y / 100 + y / 400;
-}
-
-int _is_leap(int year)
-{
-    return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
-}
-
-int _is_long_year(int year)
-{
-    return (_p(year) % 7 == 4) || (_p(year - 1) % 7 == 3);
-}
-
-int _week_day(int year, int month, int day)
-{
-    int y;
-    int w;
-
-    y = year - (month < 3);
-
-    w = (_p(y) + DAY_OF_WEEK_TABLE[month - 1] + day) % 7;
-
-    if (!w)
-    {
-        w = 7;
-    }
-
-    return w;
-}
-
-int _days_in_year(int year)
-{
-    if (_is_leap(year))
-    {
-        return DAYS_PER_L_YEAR;
-    }
-
-    return DAYS_PER_N_YEAR;
-}
-
-int _day_number(int year, int month, int day)
-{
-    month = (month + 9) % 12;
-    year = year - month / 10;
-
-    return (
-        365 * year + year / 4 - year / 100 + year / 400 + (month * 306 + 5) / 10 + (day - 1));
-}
-
-int _get_offset(PyObject *dt)
-{
-    PyObject *tzinfo;
-    PyObject *offset;
-
-    tzinfo = ((PyDateTime_DateTime *)(dt))->tzinfo;
-
-    if (tzinfo != Py_None)
-    {
-        offset = PyObject_CallMethod(tzinfo, "utcoffset", "O", dt);
-
-        return PyDateTime_DELTA_GET_DAYS(offset) * SECS_PER_DAY + PyDateTime_DELTA_GET_SECONDS(offset);
-    }
-
-    return 0;
-}
-
-int _has_tzinfo(PyObject *dt)
-{
-    return ((_PyDateTime_BaseTZInfo *)(dt))->hastzinfo;
-}
-
-char *_get_tz_name(PyObject *dt)
-{
-    PyObject *tzinfo;
-    char *tz = "";
-
-    tzinfo = ((PyDateTime_DateTime *)(dt))->tzinfo;
-
-    if (tzinfo != Py_None)
-    {
-        if (PyObject_HasAttrString(tzinfo, "key"))
-        {
-            // zoneinfo timezone
-            tz = (char *)PyUnicode_AsUTF8(
-                PyObject_GetAttrString(tzinfo, "name"));
-        }
-        else if (PyObject_HasAttrString(tzinfo, "name"))
-        {
-            // Pendulum timezone
-            tz = (char *)PyUnicode_AsUTF8(
-                PyObject_GetAttrString(tzinfo, "name"));
-        }
-        else if (PyObject_HasAttrString(tzinfo, "zone"))
-        {
-            // pytz timezone
-            tz = (char *)PyUnicode_AsUTF8(
-                PyObject_GetAttrString(tzinfo, "zone"));
-        }
-    }
-
-    return tz;
-}
-
-/* ------------------------ Custom Types ------------------------------- */
-
-/*
- * class Diff():
- */
-typedef struct
-{
-    PyObject_HEAD int years;
-    int months;
-    int days;
-    int hours;
-    int minutes;
-    int seconds;
-    int microseconds;
-    int total_days;
-} Diff;
-
-/*
- * def __init__(self, years, months, days, hours, minutes, seconds, microseconds, total_days):
- *     self.years = years
- *     # ...
-*/
-static int Diff_init(Diff *self, PyObject *args, PyObject *kwargs)
-{
-    int years;
-    int months;
-    int days;
-    int hours;
-    int minutes;
-    int seconds;
-    int microseconds;
-    int total_days;
-
-    if (!PyArg_ParseTuple(args, "iiiiiii", &years, &months, &days, &hours, &minutes, &seconds, &microseconds, &total_days))
-        return -1;
-
-    self->years = years;
-    self->months = months;
-    self->days = days;
-    self->hours = hours;
-    self->minutes = minutes;
-    self->seconds = seconds;
-    self->microseconds = microseconds;
-    self->total_days = total_days;
-
-    return 0;
-}
-
-/*
- * def __repr__(self):
- *     return '{} years {} months {} days {} hours {} minutes {} seconds {} microseconds'.format(
- *         self.years, self.months, self.days, self.minutes, self.hours, self.seconds, self.microseconds
- *     )
- */
-static PyObject *Diff_repr(Diff *self)
-{
-    return PyUnicode_FromFormat(
-        "%d years %d months %d days %d hours %d minutes %d seconds %d microseconds",
-        self->years,
-        self->months,
-        self->days,
-        self->hours,
-        self->minutes,
-        self->seconds,
-        self->microseconds);
-}
-
-/*
- * Instantiate new Diff_type object
- * Skip overhead of calling PyObject_New and PyObject_Init.
- * Directly allocate object.
- */
-static PyObject *new_diff_ex(int years, int months, int days, int hours, int minutes, int seconds, int microseconds, int total_days, PyTypeObject *type)
-{
-    Diff *self = (Diff *)(type->tp_alloc(type, 0));
-
-    if (self != NULL)
-    {
-        self->years = years;
-        self->months = months;
-        self->days = days;
-        self->hours = hours;
-        self->minutes = minutes;
-        self->seconds = seconds;
-        self->microseconds = microseconds;
-        self->total_days = total_days;
-    }
-
-    return (PyObject *)self;
-}
-
-/*
- * Class member / class attributes
- */
-static PyMemberDef Diff_members[] = {
-    {"years", T_INT, offsetof(Diff, years), 0, "years in diff"},
-    {"months", T_INT, offsetof(Diff, months), 0, "months in diff"},
-    {"days", T_INT, offsetof(Diff, days), 0, "days in diff"},
-    {"hours", T_INT, offsetof(Diff, hours), 0, "hours in diff"},
-    {"minutes", T_INT, offsetof(Diff, minutes), 0, "minutes in diff"},
-    {"seconds", T_INT, offsetof(Diff, seconds), 0, "seconds in diff"},
-    {"microseconds", T_INT, offsetof(Diff, microseconds), 0, "microseconds in diff"},
-    {"total_days", T_INT, offsetof(Diff, total_days), 0, "total days in diff"},
-    {NULL}};
-
-static PyTypeObject Diff_type = {
-    PyVarObject_HEAD_INIT(NULL, 0) "PreciseDiff",      /* tp_name */
-    sizeof(Diff),                                      /* tp_basicsize */
-    0,                                                 /* tp_itemsize */
-    0,                                                 /* tp_dealloc */
-    0,                                                 /* tp_print */
-    0,                                                 /* tp_getattr */
-    0,                                                 /* tp_setattr */
-    0,                                                 /* tp_as_async */
-    (reprfunc)Diff_repr,                               /* tp_repr */
-    0,                                                 /* tp_as_number */
-    0,                                                 /* tp_as_sequence */
-    0,                                                 /* tp_as_mapping */
-    0,                                                 /* tp_hash  */
-    0,                                                 /* tp_call */
-    (reprfunc)Diff_repr,                               /* tp_str */
-    0,                                                 /* tp_getattro */
-    0,                                                 /* tp_setattro */
-    0,                                                 /* tp_as_buffer */
-    Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,          /* tp_flags */
-    "Precise difference between two datetime objects", /* tp_doc */
-};
-
-#define new_diff(years, months, days, hours, minutes, seconds, microseconds, total_days) new_diff_ex(years, months, days, hours, minutes, seconds, microseconds, total_days, &Diff_type)
-
-/* -------------------------- Functions --------------------------*/
-
-PyObject *is_leap(PyObject *self, PyObject *args)
-{
-    PyObject *leap;
-    int year;
-
-    if (!PyArg_ParseTuple(args, "i", &year))
-    {
-        PyErr_SetString(
-            PyExc_ValueError, "Invalid parameters");
-        return NULL;
-    }
-
-    leap = PyBool_FromLong(_is_leap(year));
-
-    return leap;
-}
-
-PyObject *is_long_year(PyObject *self, PyObject *args)
-{
-    PyObject *is_long;
-    int year;
-
-    if (!PyArg_ParseTuple(args, "i", &year))
-    {
-        PyErr_SetString(
-            PyExc_ValueError, "Invalid parameters");
-        return NULL;
-    }
-
-    is_long = PyBool_FromLong(_is_long_year(year));
-
-    return is_long;
-}
-
-PyObject *week_day(PyObject *self, PyObject *args)
-{
-    PyObject *wd;
-    int year;
-    int month;
-    int day;
-
-    if (!PyArg_ParseTuple(args, "iii", &year, &month, &day))
-    {
-        PyErr_SetString(
-            PyExc_ValueError, "Invalid parameters");
-        return NULL;
-    }
-
-    wd = PyLong_FromLong(_week_day(year, month, day));
-
-    return wd;
-}
-
-PyObject *days_in_year(PyObject *self, PyObject *args)
-{
-    PyObject *ndays;
-    int year;
-
-    if (!PyArg_ParseTuple(args, "i", &year))
-    {
-        PyErr_SetString(
-            PyExc_ValueError, "Invalid parameters");
-        return NULL;
-    }
-
-    ndays = PyLong_FromLong(_days_in_year(year));
-
-    return ndays;
-}
-
-PyObject *timestamp(PyObject *self, PyObject *args)
-{
-    int64_t result;
-    PyObject *dt;
-
-    if (!PyArg_ParseTuple(args, "O", &dt))
-    {
-        PyErr_SetString(
-            PyExc_ValueError, "Invalid parameters");
-        return NULL;
-    }
-
-    int year = (double)PyDateTime_GET_YEAR(dt);
-    int month = PyDateTime_GET_MONTH(dt);
-    int day = PyDateTime_GET_DAY(dt);
-    int hour = PyDateTime_DATE_GET_HOUR(dt);
-    int minute = PyDateTime_DATE_GET_MINUTE(dt);
-    int second = PyDateTime_DATE_GET_SECOND(dt);
-
-    result = (year - 1970) * 365 + MONTHS_OFFSETS[0][month];
-    result += (int)floor((double)(year - 1968) / 4);
-    result -= (year - 1900) / 100;
-    result += (year - 1600) / 400;
-
-    if (_is_leap(year) && month < 3)
-    {
-        result -= 1;
-    }
-
-    result += day - 1;
-    result *= 24;
-    result += hour;
-    result *= 60;
-    result += minute;
-    result *= 60;
-    result += second;
-
-    return PyLong_FromSsize_t(result);
-}
-
-PyObject *local_time(PyObject *self, PyObject *args)
-{
-    double unix_time;
-    int32_t utc_offset;
-    int32_t year;
-    int32_t microsecond;
-    int64_t seconds;
-    int32_t leap_year;
-    int64_t sec_per_100years;
-    int64_t sec_per_4years;
-    int32_t sec_per_year;
-    int32_t month;
-    int32_t day;
-    int32_t month_offset;
-    int32_t hour;
-    int32_t minute;
-    int32_t second;
-
-    if (!PyArg_ParseTuple(args, "dii", &unix_time, &utc_offset, &microsecond))
-    {
-        PyErr_SetString(
-            PyExc_ValueError, "Invalid parameters");
-        return NULL;
-    }
-
-    year = EPOCH_YEAR;
-    seconds = (int64_t)floor(unix_time);
-
-    // Shift to a base year that is 400-year aligned.
-    if (seconds >= 0)
-    {
-        seconds -= 10957L * SECS_PER_DAY;
-        year += 30; // == 2000;
-    }
-    else
-    {
-        seconds += (int64_t)(146097L - 10957L) * SECS_PER_DAY;
-        year -= 370; // == 1600;
-    }
-
-    seconds += utc_offset;
-
-    // Handle years in chunks of 400/100/4/1
-    year += 400 * (seconds / SECS_PER_400_YEARS);
-    seconds %= SECS_PER_400_YEARS;
-    if (seconds < 0)
-    {
-        seconds += SECS_PER_400_YEARS;
-        year -= 400;
-    }
-
-    leap_year = 1; // 4-century aligned
-
-    sec_per_100years = SECS_PER_100_YEARS[leap_year];
-
-    while (seconds >= sec_per_100years)
-    {
-        seconds -= sec_per_100years;
-        year += 100;
-        leap_year = 0; // 1-century, non 4-century aligned
-        sec_per_100years = SECS_PER_100_YEARS[leap_year];
-    }
-
-    sec_per_4years = SECS_PER_4_YEARS[leap_year];
-    while (seconds >= sec_per_4years)
-    {
-        seconds -= sec_per_4years;
-        year += 4;
-        leap_year = 1; // 4-year, non century aligned
-        sec_per_4years = SECS_PER_4_YEARS[leap_year];
-    }
-
-    sec_per_year = SECS_PER_YEAR[leap_year];
-    while (seconds >= sec_per_year)
-    {
-        seconds -= sec_per_year;
-        year += 1;
-        leap_year = 0; // non 4-year aligned
-        sec_per_year = SECS_PER_YEAR[leap_year];
-    }
-
-    // Handle months and days
-    month = TM_DECEMBER + 1;
-    day = seconds / SECS_PER_DAY + 1;
-    seconds %= SECS_PER_DAY;
-    while (month != TM_JANUARY + 1)
-    {
-        month_offset = MONTHS_OFFSETS[leap_year][month];
-        if (day > month_offset)
-        {
-            day -= month_offset;
-            break;
-        }
-
-        month -= 1;
-    }
-
-    // Handle hours, minutes and seconds
-    hour = seconds / SECS_PER_HOUR;
-    seconds %= SECS_PER_HOUR;
-    minute = seconds / SECS_PER_MIN;
-    second = seconds % SECS_PER_MIN;
-
-    return Py_BuildValue("NNNNNNN",
-                         PyLong_FromLong(year),
-                         PyLong_FromLong(month),
-                         PyLong_FromLong(day),
-                         PyLong_FromLong(hour),
-                         PyLong_FromLong(minute),
-                         PyLong_FromLong(second),
-                         PyLong_FromLong(microsecond));
-}
-
-// Calculate a precise difference between two datetimes.
-PyObject *precise_diff(PyObject *self, PyObject *args)
-{
-    PyObject *dt1;
-    PyObject *dt2;
-
-    if (!PyArg_ParseTuple(args, "OO", &dt1, &dt2))
-    {
-        PyErr_SetString(
-            PyExc_ValueError, "Invalid parameters");
-        return NULL;
-    }
-
-    int year_diff = 0;
-    int month_diff = 0;
-    int day_diff = 0;
-    int hour_diff = 0;
-    int minute_diff = 0;
-    int second_diff = 0;
-    int microsecond_diff = 0;
-    int sign = 1;
-    int year;
-    int month;
-    int leap;
-    int days_in_last_month;
-    int days_in_month;
-    int dt1_year = PyDateTime_GET_YEAR(dt1);
-    int dt2_year = PyDateTime_GET_YEAR(dt2);
-    int dt1_month = PyDateTime_GET_MONTH(dt1);
-    int dt2_month = PyDateTime_GET_MONTH(dt2);
-    int dt1_day = PyDateTime_GET_DAY(dt1);
-    int dt2_day = PyDateTime_GET_DAY(dt2);
-    int dt1_hour = 0;
-    int dt2_hour = 0;
-    int dt1_minute = 0;
-    int dt2_minute = 0;
-    int dt1_second = 0;
-    int dt2_second = 0;
-    int dt1_microsecond = 0;
-    int dt2_microsecond = 0;
-    int dt1_total_seconds = 0;
-    int dt2_total_seconds = 0;
-    int dt1_offset = 0;
-    int dt2_offset = 0;
-    int dt1_is_datetime = PyDateTime_Check(dt1);
-    int dt2_is_datetime = PyDateTime_Check(dt2);
-    char *tz1 = "";
-    char *tz2 = "";
-    int in_same_tz = 0;
-    int total_days = (_day_number(dt2_year, dt2_month, dt2_day) - _day_number(dt1_year, dt1_month, dt1_day));
-
-    // If both dates are datetimes, we check
-    // If we are in the same timezone
-    if (dt1_is_datetime && dt2_is_datetime)
-    {
-        if (_has_tzinfo(dt1))
-        {
-            tz1 = _get_tz_name(dt1);
-            dt1_offset = _get_offset(dt1);
-        }
-
-        if (_has_tzinfo(dt2))
-        {
-            tz2 = _get_tz_name(dt2);
-            dt2_offset = _get_offset(dt2);
-        }
-
-        in_same_tz = tz1 == tz2 && strncmp(tz1, "", 1);
-    }
-
-    // If we have datetimes (and not only dates)
-    // we get the information we need
-    if (dt1_is_datetime)
-    {
-        dt1_hour = PyDateTime_DATE_GET_HOUR(dt1);
-        dt1_minute = PyDateTime_DATE_GET_MINUTE(dt1);
-        dt1_second = PyDateTime_DATE_GET_SECOND(dt1);
-        dt1_microsecond = PyDateTime_DATE_GET_MICROSECOND(dt1);
-
-        if ((!in_same_tz && dt1_offset != 0) || total_days == 0)
-        {
-            dt1_hour -= dt1_offset / SECS_PER_HOUR;
-            dt1_offset %= SECS_PER_HOUR;
-            dt1_minute -= dt1_offset / SECS_PER_MIN;
-            dt1_offset %= SECS_PER_MIN;
-            dt1_second -= dt1_offset;
-
-            if (dt1_second < 0)
-            {
-                dt1_second += 60;
-                dt1_minute -= 1;
-            }
-            else if (dt1_second > 60)
-            {
-                dt1_second -= 60;
-                dt1_minute += 1;
-            }
-
-            if (dt1_minute < 0)
-            {
-                dt1_minute += 60;
-                dt1_hour -= 1;
-            }
-            else if (dt1_minute > 60)
-            {
-                dt1_minute -= 60;
-                dt1_hour += 1;
-            }
-
-            if (dt1_hour < 0)
-            {
-                dt1_hour += 24;
-                dt1_day -= 1;
-            }
-            else if (dt1_hour > 24)
-            {
-                dt1_hour -= 24;
-                dt1_day += 1;
-            }
-        }
-
-        dt1_total_seconds = (dt1_hour * SECS_PER_HOUR + dt1_minute * SECS_PER_MIN + dt1_second);
-    }
-
-    if (dt2_is_datetime)
-    {
-        dt2_hour = PyDateTime_DATE_GET_HOUR(dt2);
-        dt2_minute = PyDateTime_DATE_GET_MINUTE(dt2);
-        dt2_second = PyDateTime_DATE_GET_SECOND(dt2);
-        dt2_microsecond = PyDateTime_DATE_GET_MICROSECOND(dt2);
-
-        if ((!in_same_tz && dt2_offset != 0) || total_days == 0)
-        {
-            dt2_hour -= dt2_offset / SECS_PER_HOUR;
-            dt2_offset %= SECS_PER_HOUR;
-            dt2_minute -= dt2_offset / SECS_PER_MIN;
-            dt2_offset %= SECS_PER_MIN;
-            dt2_second -= dt2_offset;
-
-            if (dt2_second < 0)
-            {
-                dt2_second += 60;
-                dt2_minute -= 1;
-            }
-            else if (dt2_second > 60)
-            {
-                dt2_second -= 60;
-                dt2_minute += 1;
-            }
-
-            if (dt2_minute < 0)
-            {
-                dt2_minute += 60;
-                dt2_hour -= 1;
-            }
-            else if (dt2_minute > 60)
-            {
-                dt2_minute -= 60;
-                dt2_hour += 1;
-            }
-
-            if (dt2_hour < 0)
-            {
-                dt2_hour += 24;
-                dt2_day -= 1;
-            }
-            else if (dt2_hour > 24)
-            {
-                dt2_hour -= 24;
-                dt2_day += 1;
-            }
-        }
-
-        dt2_total_seconds = (dt2_hour * SECS_PER_HOUR + dt2_minute * SECS_PER_MIN + dt2_second);
-    }
-
-    // Direct comparison between two datetimes does not work
-    // so we need to check by properties
-    int dt1_gt_dt2 = (dt1_year > dt2_year || (dt1_year == dt2_year && dt1_month > dt2_month) || (dt1_year == dt2_year && dt1_month == dt2_month && dt1_day > dt2_day) || (dt1_year == dt2_year && dt1_month == dt2_month && dt1_day == dt2_day && dt1_total_seconds > dt2_total_seconds) || (dt1_year == dt2_year && dt1_month == dt2_month && dt1_day == dt2_day && dt1_total_seconds == dt2_total_seconds && dt1_microsecond > dt2_microsecond));
-
-    if (dt1_gt_dt2)
-    {
-        PyObject *temp;
-        temp = dt1;
-        dt1 = dt2;
-        dt2 = temp;
-        sign = -1;
-
-        // Retrieving properties
-        dt1_year = PyDateTime_GET_YEAR(dt1);
-        dt2_year = PyDateTime_GET_YEAR(dt2);
-        dt1_month = PyDateTime_GET_MONTH(dt1);
-        dt2_month = PyDateTime_GET_MONTH(dt2);
-        dt1_day = PyDateTime_GET_DAY(dt1);
-        dt2_day = PyDateTime_GET_DAY(dt2);
-
-        if (dt2_is_datetime)
-        {
-            dt1_hour = PyDateTime_DATE_GET_HOUR(dt1);
-            dt1_minute = PyDateTime_DATE_GET_MINUTE(dt1);
-            dt1_second = PyDateTime_DATE_GET_SECOND(dt1);
-            dt1_microsecond = PyDateTime_DATE_GET_MICROSECOND(dt1);
-        }
-
-        if (dt1_is_datetime)
-        {
-            dt2_hour = PyDateTime_DATE_GET_HOUR(dt2);
-            dt2_minute = PyDateTime_DATE_GET_MINUTE(dt2);
-            dt2_second = PyDateTime_DATE_GET_SECOND(dt2);
-            dt2_microsecond = PyDateTime_DATE_GET_MICROSECOND(dt2);
-        }
-
-        total_days = (_day_number(dt2_year, dt2_month, dt2_day) - _day_number(dt1_year, dt1_month, dt1_day));
-    }
-
-    year_diff = dt2_year - dt1_year;
-    month_diff = dt2_month - dt1_month;
-    day_diff = dt2_day - dt1_day;
-    hour_diff = dt2_hour - dt1_hour;
-    minute_diff = dt2_minute - dt1_minute;
-    second_diff = dt2_second - dt1_second;
-    microsecond_diff = dt2_microsecond - dt1_microsecond;
-
-    if (microsecond_diff < 0)
-    {
-        microsecond_diff += 1e6;
-        second_diff -= 1;
-    }
-
-    if (second_diff < 0)
-    {
-        second_diff += 60;
-        minute_diff -= 1;
-    }
-
-    if (minute_diff < 0)
-    {
-        minute_diff += 60;
-        hour_diff -= 1;
-    }
-
-    if (hour_diff < 0)
-    {
-        hour_diff += 24;
-        day_diff -= 1;
-    }
-
-    if (day_diff < 0)
-    {
-        // If we have a difference in days,
-        // we have to check if they represent months
-        year = dt2_year;
-        month = dt2_month;
-
-        if (month == 1)
-        {
-            month = 12;
-            year -= 1;
-        }
-        else
-        {
-            month -= 1;
-        }
-
-        leap = _is_leap(year);
-
-        days_in_last_month = DAYS_PER_MONTHS[leap][month];
-        days_in_month = DAYS_PER_MONTHS[_is_leap(dt2_year)][dt2_month];
-
-        if (day_diff < days_in_month - days_in_last_month)
-        {
-            // We don't have a full month, we calculate days
-            if (days_in_last_month < dt1_day)
-            {
-                day_diff += dt1_day;
-            }
-            else
-            {
-                day_diff += days_in_last_month;
-            }
-        }
-        else if (day_diff == days_in_month - days_in_last_month)
-        {
-            // We have exactly a full month
-            // We remove the days difference
-            // and add one to the months difference
-            day_diff = 0;
-            month_diff += 1;
-        }
-        else
-        {
-            // We have a full month
-            day_diff += days_in_last_month;
-        }
-
-        month_diff -= 1;
-    }
-
-    if (month_diff < 0)
-    {
-        month_diff += 12;
-        year_diff -= 1;
-    }
-
-    return new_diff(
-        year_diff * sign,
-        month_diff * sign,
-        day_diff * sign,
-        hour_diff * sign,
-        minute_diff * sign,
-        second_diff * sign,
-        microsecond_diff * sign,
-        total_days * sign);
-}
-
-/* ------------------------------------------------------------------------- */
-
-static PyMethodDef helpers_methods[] = {
-    {"is_leap",
-     (PyCFunction)is_leap,
-     METH_VARARGS,
-     PyDoc_STR("Checks if a year is a leap year.")},
-    {"is_long_year",
-     (PyCFunction)is_long_year,
-     METH_VARARGS,
-     PyDoc_STR("Checks if a year is a long year.")},
-    {"week_day",
-     (PyCFunction)week_day,
-     METH_VARARGS,
-     PyDoc_STR("Returns the weekday number.")},
-    {"days_in_year",
-     (PyCFunction)days_in_year,
-     METH_VARARGS,
-     PyDoc_STR("Returns the number of days in the given year.")},
-    {"timestamp",
-     (PyCFunction)timestamp,
-     METH_VARARGS,
-     PyDoc_STR("Returns the timestamp of the given datetime.")},
-    {"local_time",
-     (PyCFunction)local_time,
-     METH_VARARGS,
-     PyDoc_STR("Returns a UNIX time as a broken down time for a particular transition type.")},
-    {"precise_diff",
-     (PyCFunction)precise_diff,
-     METH_VARARGS,
-     PyDoc_STR("Calculate a precise difference between two datetimes.")},
-    {NULL}};
-
-/* ------------------------------------------------------------------------- */
-
-static struct PyModuleDef moduledef = {
-    PyModuleDef_HEAD_INIT,
-    "_helpers",
-    NULL,
-    -1,
-    helpers_methods,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-};
-
-PyMODINIT_FUNC
-PyInit__helpers(void)
-{
-    PyObject *module;
-
-    PyDateTime_IMPORT;
-
-    module = PyModule_Create(&moduledef);
-
-    if (module == NULL)
-        return NULL;
-
-    // Diff declaration
-    Diff_type.tp_new = PyType_GenericNew;
-    Diff_type.tp_members = Diff_members;
-    Diff_type.tp_init = (initproc)Diff_init;
-
-    if (PyType_Ready(&Diff_type) < 0)
-        return NULL;
-
-    PyModule_AddObject(module, "PreciseDiff", (PyObject *)&Diff_type);
-
-    return module;
-}
diff --git a/pendulum/exceptions.py b/pendulum/exceptions.py
deleted file mode 100644
index 3ab4db9..0000000
--- a/pendulum/exceptions.py
+++ /dev/null
@@ -1,8 +0,0 @@
-from __future__ import annotations
-
-from .parsing.exceptions import ParserError  # noqa
-
-
-class PendulumException(Exception):
-
-    pass
diff --git a/pendulum/parsing/_iso8601.c b/pendulum/parsing/_iso8601.c
deleted file mode 100644
index 1322423..0000000
--- a/pendulum/parsing/_iso8601.c
+++ /dev/null
@@ -1,1361 +0,0 @@
-/* ------------------------------------------------------------------------- */
-
-#include <Python.h>
-#include <datetime.h>
-#include <structmember.h>
-#include <math.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-
-#ifndef PyVarObject_HEAD_INIT
-#define PyVarObject_HEAD_INIT(type, size) PyObject_HEAD_INIT(type) size,
-#endif
-
-
-/* ------------------------------------------------------------------------- */
-
-#define EPOCH_YEAR 1970
-
-#define DAYS_PER_N_YEAR 365
-#define DAYS_PER_L_YEAR 366
-
-#define USECS_PER_SEC 1000000
-
-#define SECS_PER_MIN 60
-#define SECS_PER_HOUR (60 * SECS_PER_MIN)
-#define SECS_PER_DAY (SECS_PER_HOUR * 24)
-
-// 400-year chunks always have 146097 days (20871 weeks).
-#define DAYS_PER_400_YEARS 146097L
-#define SECS_PER_400_YEARS ((int64_t)DAYS_PER_400_YEARS * (int64_t)SECS_PER_DAY)
-
-// The number of seconds in an aligned 100-year chunk, for those that
-// do not begin with a leap year and those that do respectively.
-const int64_t SECS_PER_100_YEARS[2] = {
-    (uint64_t)(76L * DAYS_PER_N_YEAR + 24L * DAYS_PER_L_YEAR) * SECS_PER_DAY,
-    (uint64_t)(75L * DAYS_PER_N_YEAR + 25L * DAYS_PER_L_YEAR) * SECS_PER_DAY
-};
-
-// The number of seconds in an aligned 4-year chunk, for those that
-// do not begin with a leap year and those that do respectively.
-const int32_t SECS_PER_4_YEARS[2] = {
-    (4 * DAYS_PER_N_YEAR + 0 * DAYS_PER_L_YEAR) * SECS_PER_DAY,
-    (3 * DAYS_PER_N_YEAR + 1 * DAYS_PER_L_YEAR) * SECS_PER_DAY
-};
-
-// The number of seconds in non-leap and leap years respectively.
-const int32_t SECS_PER_YEAR[2] = {
-    DAYS_PER_N_YEAR * SECS_PER_DAY,
-    DAYS_PER_L_YEAR * SECS_PER_DAY
-};
-
-#define MONTHS_PER_YEAR 12
-
-// The month lengths in non-leap and leap years respectively.
-const int32_t DAYS_PER_MONTHS[2][13] = {
-    {-1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
-    {-1, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
-};
-
-// The day offsets of the beginning of each (1-based) month in non-leap
-// and leap years respectively.
-// For example, in a leap year there are 335 days before December.
-const int32_t MONTHS_OFFSETS[2][14] = {
-    {-1, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
-    {-1, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
-};
-
-const int DAY_OF_WEEK_TABLE[12] = {
-    0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4
-};
-
-#define TM_SUNDAY 0
-#define TM_MONDAY 1
-#define TM_TUESDAY 2
-#define TM_WEDNESDAY 3
-#define TM_THURSDAY 4
-#define TM_FRIDAY 5
-#define TM_SATURDAY 6
-
-#define TM_JANUARY 0
-#define TM_FEBRUARY 1
-#define TM_MARCH 2
-#define TM_APRIL 3
-#define TM_MAY 4
-#define TM_JUNE 5
-#define TM_JULY 6
-#define TM_AUGUST 7
-#define TM_SEPTEMBER 8
-#define TM_OCTOBER 9
-#define TM_NOVEMBER 10
-#define TM_DECEMBER 11
-
-// Parsing errors
-const int PARSER_INVALID_ISO8601 = 0;
-const int PARSER_INVALID_DATE = 1;
-const int PARSER_INVALID_TIME = 2;
-const int PARSER_INVALID_WEEK_DATE = 3;
-const int PARSER_INVALID_WEEK_NUMBER = 4;
-const int PARSER_INVALID_WEEKDAY_NUMBER = 5;
-const int PARSER_INVALID_ORDINAL_DAY_FOR_YEAR = 6;
-const int PARSER_INVALID_MONTH_OR_DAY = 7;
-const int PARSER_INVALID_MONTH = 8;
-const int PARSER_INVALID_DAY_FOR_MONTH = 9;
-const int PARSER_INVALID_HOUR = 10;
-const int PARSER_INVALID_MINUTE = 11;
-const int PARSER_INVALID_SECOND = 12;
-const int PARSER_INVALID_SUBSECOND = 13;
-const int PARSER_INVALID_TZ_OFFSET = 14;
-const int PARSER_INVALID_DURATION = 15;
-const int PARSER_INVALID_DURATION_FLOAT_YEAR_MONTH_NOT_SUPPORTED = 16;
-
-const char PARSER_ERRORS[17][80] = {
-    "Invalid ISO 8601 string",
-    "Invalid date",
-    "Invalid time",
-    "Invalid week date",
-    "Invalid week number",
-    "Invalid weekday number",
-    "Invalid ordinal day for year",
-    "Invalid month and/or day",
-    "Invalid month",
-    "Invalid day for month",
-    "Invalid hour",
-    "Invalid minute",
-    "Invalid second",
-    "Invalid subsecond",
-    "Invalid timezone offset",
-    "Invalid duration",
-    "Float years and months are not supported"
-};
-
-/* ------------------------------------------------------------------------- */
-
-
-int p(int y) {
-    return y + y/4 - y/100 + y/400;
-}
-
-int is_leap(int year) {
-    return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
-}
-
-int week_day(int year, int month, int day) {
-    int y;
-    int w;
-
-    y = year - (month < 3);
-
-    w = (p(y) + DAY_OF_WEEK_TABLE[month - 1] + day) % 7;
-
-    if (!w) {
-        w = 7;
-    }
-
-    return w;
-}
-
-int days_in_year(int year) {
-    if (is_leap(year)) {
-        return DAYS_PER_L_YEAR;
-    }
-
-    return DAYS_PER_N_YEAR;
-}
-
-int is_long_year(int year) {
-    return (p(year) % 7 == 4) || (p(year - 1) % 7 == 3);
-}
-
-
-/* ------------------------ Custom Types ------------------------------- */
-
-
-/*
- * class FixedOffset(tzinfo):
- */
-typedef struct {
-    PyObject_HEAD
-    int offset;
-    char *tzname;
-} FixedOffset;
-
-/*
- * def __init__(self, offset):
- *     self.offset = offset
-*/
-static int FixedOffset_init(FixedOffset *self, PyObject *args, PyObject *kwargs) {
-    int offset;
-    char *tzname = NULL;
-
-    static char *kwlist[] = {"offset", "tzname", NULL};
-
-    if (!PyArg_ParseTupleAndKeywords(args, kwargs, "i|s", kwlist, &offset, &tzname))
-        return -1;
-
-    self->offset = offset;
-    self->tzname = tzname;
-
-    return 0;
-}
-
-/*
- * def utcoffset(self, dt):
- *     return timedelta(seconds=self.offset * 60)
- */
-static PyObject *FixedOffset_utcoffset(FixedOffset *self, PyObject *args) {
-    return PyDelta_FromDSU(0, self->offset, 0);
-}
-
-/*
- * def dst(self, dt):
- *     return timedelta(seconds=self.offset * 60)
- */
-static PyObject *FixedOffset_dst(FixedOffset *self, PyObject *args) {
-    return PyDelta_FromDSU(0, self->offset, 0);
-}
-
-/*
- * def tzname(self, dt):
- *     sign = '+'
- *     if self.offset < 0:
- *         sign = '-'
- *     return f"{sign}{self.offset / 60}:{self.offset % 60}"
- */
-static PyObject *FixedOffset_tzname(FixedOffset *self, PyObject *args) {
-    if (self->tzname != NULL) {
-        return PyUnicode_FromString(self->tzname);
-    }
-
-    char sign = '+';
-    int offset = self->offset;
-
-    if (offset < 0) {
-        sign = '-';
-        offset *= -1;
-    }
-
-    return PyUnicode_FromFormat(
-        "%c%02d:%02d",
-        sign,
-        offset / SECS_PER_HOUR,
-        offset / SECS_PER_MIN % SECS_PER_MIN
-    );
-}
-
-/*
- * def __repr__(self):
- *     return self.tzname()
- */
-static PyObject *FixedOffset_repr(FixedOffset *self) {
-    return FixedOffset_tzname(self, NULL);
-}
-
-/*
- * Class member / class attributes
- */
-static PyMemberDef FixedOffset_members[] = {
-    {"offset", T_INT, offsetof(FixedOffset, offset), 0, "UTC offset"},
-    {NULL}
-};
-
-/*
- * Class methods
- */
-static PyMethodDef FixedOffset_methods[] = {
-    {"utcoffset", (PyCFunction)FixedOffset_utcoffset, METH_VARARGS, ""},
-    {"dst",       (PyCFunction)FixedOffset_dst,       METH_VARARGS, ""},
-    {"tzname",    (PyCFunction)FixedOffset_tzname,    METH_VARARGS, ""},
-    {NULL}
-};
-
-static PyTypeObject FixedOffset_type = {
-    PyVarObject_HEAD_INIT(NULL, 0)
-    "FixedOffset_type",             /* tp_name */
-    sizeof(FixedOffset),                    /* tp_basicsize */
-    0,                                      /* tp_itemsize */
-    0,                                      /* tp_dealloc */
-    0,                                      /* tp_print */
-    0,                                      /* tp_getattr */
-    0,                                      /* tp_setattr */
-    0,                                      /* tp_as_async */
-    (reprfunc)FixedOffset_repr,             /* tp_repr */
-    0,                                      /* tp_as_number */
-    0,                                      /* tp_as_sequence */
-    0,                                      /* tp_as_mapping */
-    0,                                      /* tp_hash  */
-    0,                                      /* tp_call */
-    (reprfunc)FixedOffset_repr,             /* tp_str */
-    0,                                      /* tp_getattro */
-    0,                                      /* tp_setattro */
-    0,                                      /* tp_as_buffer */
-    Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, /* tp_flags */
-    "TZInfo with fixed offset",             /* tp_doc */
-};
-
-/*
- * Instantiate new FixedOffset_type object
- * Skip overhead of calling PyObject_New and PyObject_Init.
- * Directly allocate object.
- */
-static PyObject *new_fixed_offset_ex(int offset, char *name, PyTypeObject *type) {
-    FixedOffset *self = (FixedOffset *) (type->tp_alloc(type, 0));
-
-    if (self != NULL) {
-        self->offset = offset;
-        self->tzname = name;
-    }
-
-    return (PyObject *) self;
-}
-
-#define new_fixed_offset(offset, name) new_fixed_offset_ex(offset, name, &FixedOffset_type)
-
-
-/*
- * class Duration():
- */
-typedef struct {
-    PyObject_HEAD
-    int years;
-    int months;
-    int weeks;
-    int days;
-    int hours;
-    int minutes;
-    int seconds;
-    int microseconds;
-} Duration;
-
-/*
- * def __init__(self, years, months, days, hours, minutes, seconds, microseconds):
- *     self.years = years
- *     # ...
-*/
-static int Duration_init(Duration *self, PyObject *args, PyObject *kwargs) {
-    int years;
-    int months;
-    int weeks;
-    int days;
-    int hours;
-    int minutes;
-    int seconds;
-    int microseconds;
-
-    if (!PyArg_ParseTuple(args, "iiiiiiii", &years, &months, &weeks, &days, &hours, &minutes, &seconds, &microseconds))
-        return -1;
-
-    self->years = years;
-    self->months = months;
-    self->weeks = weeks;
-    self->days = days;
-    self->hours = hours;
-    self->minutes = minutes;
-    self->seconds = seconds;
-    self->microseconds = microseconds;
-
-    return 0;
-}
-
-/*
- * def __repr__(self):
- *     return '{} years {} months {} days {} hours {} minutes {} seconds {} microseconds'.format(
- *         self.years, self.months, self.days, self.minutes, self.hours, self.seconds, self.microseconds
- *     )
- */
-static PyObject *Duration_repr(Duration *self) {
-    return PyUnicode_FromFormat(
-        "%d years %d months %d weeks %d days %d hours %d minutes %d seconds %d microseconds",
-        self->years,
-        self->months,
-        self->weeks,
-        self->days,
-        self->hours,
-        self->minutes,
-        self->seconds,
-        self->microseconds
-    );
-}
-
-/*
- * Instantiate new Duration_type object
- * Skip overhead of calling PyObject_New and PyObject_Init.
- * Directly allocate object.
- */
-static PyObject *new_duration_ex(int years, int months, int weeks, int days, int hours, int minutes, int seconds, int microseconds, PyTypeObject *type) {
-    Duration *self = (Duration *) (type->tp_alloc(type, 0));
-
-    if (self != NULL) {
-        self->years = years;
-        self->months = months;
-        self->weeks = weeks;
-        self->days = days;
-        self->hours = hours;
-        self->minutes = minutes;
-        self->seconds = seconds;
-        self->microseconds = microseconds;
-    }
-
-    return (PyObject *) self;
-}
-
-/*
- * Class member / class attributes
- */
-static PyMemberDef Duration_members[] = {
-    {"years", T_INT, offsetof(Duration, years), 0, "years in duration"},
-    {"months", T_INT, offsetof(Duration, months), 0, "months in duration"},
-    {"weeks", T_INT, offsetof(Duration, weeks), 0, "weeks in duration"},
-    {"days", T_INT, offsetof(Duration, days), 0, "days in duration"},
-    {"remaining_days", T_INT, offsetof(Duration, days), 0, "days in duration"},
-    {"hours", T_INT, offsetof(Duration, hours), 0, "hours in duration"},
-    {"minutes", T_INT, offsetof(Duration, minutes), 0, "minutes in duration"},
-    {"seconds", T_INT, offsetof(Duration, seconds), 0, "seconds in duration"},
-    {"remaining_seconds", T_INT, offsetof(Duration, seconds), 0, "seconds in duration"},
-    {"microseconds", T_INT, offsetof(Duration, microseconds), 0, "microseconds in duration"},
-    {NULL}
-};
-
-static PyTypeObject Duration_type = {
-    PyVarObject_HEAD_INIT(NULL, 0)
-    "Duration",                             /* tp_name */
-    sizeof(Duration),                       /* tp_basicsize */
-    0,                                      /* tp_itemsize */
-    0,                                      /* tp_dealloc */
-    0,                                      /* tp_print */
-    0,                                      /* tp_getattr */
-    0,                                      /* tp_setattr */
-    0,                                      /* tp_as_async */
-    (reprfunc)Duration_repr,                /* tp_repr */
-    0,                                      /* tp_as_number */
-    0,                                      /* tp_as_sequence */
-    0,                                      /* tp_as_mapping */
-    0,                                      /* tp_hash  */
-    0,                                      /* tp_call */
-    (reprfunc)Duration_repr,                /* tp_str */
-    0,                                      /* tp_getattro */
-    0,                                      /* tp_setattro */
-    0,                                      /* tp_as_buffer */
-    Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, /* tp_flags */
-    "Duration",                             /* tp_doc */
-};
-
-#define new_duration(years, months, weeks, days, hours, minutes, seconds, microseconds) new_duration_ex(years, months, weeks, days, hours, minutes, seconds, microseconds, &Duration_type)
-
-typedef struct {
-    int is_date;
-    int is_time;
-    int is_datetime;
-    int is_duration;
-    int is_period;
-    int ambiguous;
-    int year;
-    int month;
-    int day;
-    int hour;
-    int minute;
-    int second;
-    int microsecond;
-    int offset;
-    int has_offset;
-    char *tzname;
-    int years;
-    int months;
-    int weeks;
-    int days;
-    int hours;
-    int minutes;
-    int seconds;
-    int microseconds;
-    int error;
-} Parsed;
-
-
-Parsed* new_parsed() {
-    Parsed *parsed;
-
-    if((parsed = malloc(sizeof *parsed)) != NULL) {
-        parsed->is_date = 0;
-        parsed->is_time = 0;
-        parsed->is_datetime = 0;
-        parsed->is_duration = 0;
-        parsed->is_period = 0;
-
-        parsed->ambiguous = 0;
-        parsed->year = 0;
-        parsed->month = 1;
-        parsed->day = 1;
-        parsed->hour = 0;
-        parsed->minute = 0;
-        parsed->second = 0;
-        parsed->microsecond = 0;
-        parsed->offset = 0;
-        parsed->has_offset = 0;
-        parsed->tzname = NULL;
-
-        parsed->years = 0;
-        parsed->months = 0;
-        parsed->weeks = 0;
-        parsed->days = 0;
-        parsed->hours = 0;
-        parsed->minutes = 0;
-        parsed->seconds = 0;
-        parsed->microseconds = 0;
-
-        parsed->error = -1;
-    }
-
-    return parsed;
-}
-
-
-/* -------------------------- Functions --------------------------*/
-
-Parsed* _parse_iso8601_datetime(char *str, Parsed *parsed) {
-    char* c;
-    int monthday = 0;
-    int week = 0;
-    int weekday = 1;
-    int ordinal;
-    int tz_sign = 0;
-    int leap = 0;
-    int separators = 0;
-    int time = 0;
-    int i;
-    int j;
-
-    // Assuming date only for now
-    parsed->is_date = 1;
-
-    c = str;
-
-    for (i = 0; i < 4; i++) {
-        if (*c >= '0' && *c <= '9') {
-            parsed->year = 10 * parsed->year + *c++ - '0';
-        } else {
-            parsed->error = PARSER_INVALID_ISO8601;
-
-            return NULL;
-        }
-    }
-
-    leap = is_leap(parsed->year);
-
-    // Optional separator
-    if (*c == '-') {
-        separators++;
-        c++;
-    }
-
-    // Checking for week dates
-    if (*c == 'W') {
-        c++;
-
-        i = 0;
-        while (*c != '\0' && *c != ' ' && *c != 'T') {
-            if (*c == '-') {
-                separators++;
-                c++;
-                continue;
-            }
-
-            week = 10 * week + *c++ - '0';
-
-            i++;
-        }
-
-        switch (i) {
-            case 2:
-                // Only week number
-                break;
-            case 3:
-                // Week with weekday
-                if (!(separators == 0 || separators == 2)) {
-                    // We should have 2 or no separator
-                    parsed->error = PARSER_INVALID_WEEK_DATE;
-
-                    return NULL;
-                }
-
-                weekday = week % 10;
-                week /= 10;
-
-                break;
-            default:
-                // Any other case is wrong
-                parsed->error = PARSER_INVALID_WEEK_DATE;
-
-                return NULL;
-        }
-
-        // Checks
-        if (week > 53 || (week > 52 && !is_long_year(parsed->year))) {
-            parsed->error = PARSER_INVALID_WEEK_NUMBER;
-
-            return NULL;
-        }
-
-        if (weekday > 7) {
-            parsed->error = PARSER_INVALID_WEEKDAY_NUMBER;
-
-            return NULL;
-        }
-
-        // Calculating ordinal day
-        ordinal = week * 7 + weekday - (week_day(parsed->year, 1, 4) + 3);
-
-        if (ordinal < 1) {
-            // Previous year
-            ordinal += days_in_year(parsed->year - 1);
-            parsed->year -= 1;
-            leap = is_leap(parsed->year);
-        }
-
-        if (ordinal > days_in_year(parsed->year)) {
-            // Next year
-            ordinal -= days_in_year(parsed->year);
-            parsed->year += 1;
-            leap = is_leap(parsed->year);
-        }
-
-        for (j = 1; j < 14; j++) {
-            if (ordinal <= MONTHS_OFFSETS[leap][j]) {
-                parsed->day = ordinal - MONTHS_OFFSETS[leap][j - 1];
-                parsed->month = j - 1;
-
-                break;
-            }
-        }
-    } else {
-        // At this point we need to check the number
-        // of characters until the end of the date part
-        // (or the end of the string).
-        //
-        // If two, we have only a month if there is a separator, it may be a time otherwise.
-        // If three, we have an ordinal date.
-        // If four, we have a complete date
-        i = 0;
-        while (*c != '\0' && *c != ' ' && *c != 'T') {
-            if (*c == '-') {
-                separators++;
-                c++;
-                continue;
-            }
-
-            if (!(*c >= '0' && *c <='9')) {
-                parsed->error = PARSER_INVALID_DATE;
-
-                return NULL;
-            }
-
-            monthday = 10 * monthday + *c++ - '0';
-
-            i++;
-        }
-
-        switch (i) {
-            case 0:
-                // No month/day specified (only a year)
-                break;
-            case 2:
-                if (!separators) {
-                    // The date looks like 201207
-                    // which is invalid for a date
-                    // But it might be a time in the form hhmmss
-                    parsed->ambiguous = 1;
-                } else if (separators > 1) {
-                    parsed->error = PARSER_INVALID_DATE;
-
-                    return NULL;
-                }
-
-                parsed->month = monthday;
-                break;
-            case 3:
-                // Ordinal day
-                if (separators > 1) {
-                    parsed->error = PARSER_INVALID_DATE;
-
-                    return NULL;
-                }
-
-                if (monthday < 1 || monthday > MONTHS_OFFSETS[leap][13]) {
-                    parsed->error = PARSER_INVALID_ORDINAL_DAY_FOR_YEAR;
-
-                    return NULL;
-                }
-
-                for (j = 1; j < 14; j++) {
-                    if (monthday <= MONTHS_OFFSETS[leap][j]) {
-                        parsed->day = monthday - MONTHS_OFFSETS[leap][j - 1];
-                        parsed->month = j - 1;
-
-                        break;
-                    }
-                }
-
-                break;
-            case 4:
-                // Month and day
-                parsed->month = monthday / 100;
-                parsed->day = monthday % 100;
-
-                break;
-            default:
-                parsed->error = PARSER_INVALID_MONTH_OR_DAY;
-
-                return NULL;
-        }
-    }
-
-    // Checks
-    if (separators && !monthday && !week) {
-        parsed->error = PARSER_INVALID_DATE;
-
-        return NULL;
-    }
-
-    if (parsed->month > 12) {
-        parsed->error = PARSER_INVALID_MONTH;
-
-        return NULL;
-    }
-
-    if (parsed->day > DAYS_PER_MONTHS[leap][parsed->month]) {
-        parsed->error = PARSER_INVALID_DAY_FOR_MONTH;
-
-        return NULL;
-    }
-
-    separators = 0;
-    if (*c == 'T' || *c == ' ') {
-        if (parsed->ambiguous) {
-            parsed->error = PARSER_INVALID_DATE;
-
-            return NULL;
-        }
-
-        // We have time so we have a datetime
-        parsed->is_datetime = 1;
-        parsed->is_date = 0;
-
-        c++;
-
-        // Grabbing time information
-        i = 0;
-        while (*c != '\0' && *c != '.' && *c != ',' && *c != 'Z' && *c != '+' && *c != '-') {
-            if (*c == ':') {
-                separators++;
-                c++;
-                continue;
-            }
-
-            if (!(*c >= '0' && *c <='9')) {
-                parsed->error = PARSER_INVALID_TIME;
-
-                return NULL;
-            }
-
-            time = 10 * time + *c++ - '0';
-            i++;
-        }
-
-        switch (i) {
-            case 2:
-                // Hours only
-                if (separators > 0) {
-                    // Extraneous separators
-                    parsed->error = PARSER_INVALID_TIME;
-
-                    return NULL;
-                }
-
-                parsed->hour = time;
-                break;
-            case 4:
-                // Hours and minutes
-                if (separators > 1) {
-                    // Extraneous separators
-                    parsed->error = PARSER_INVALID_TIME;
-
-                    return NULL;
-                }
-
-                parsed->hour = time / 100;
-                parsed->minute = time % 100;
-                break;
-            case 6:
-                // Hours, minutes and seconds
-                if (!(separators == 0 || separators == 2)) {
-                    // We should have either two separators or none
-                    parsed->error = PARSER_INVALID_TIME;
-
-                    return NULL;
-                }
-
-                parsed->hour = time / 10000;
-                parsed->minute = time / 100 % 100;
-                parsed->second = time % 100;
-                break;
-            default:
-                // Any other case is wrong
-                parsed->error = PARSER_INVALID_TIME;
-
-                return NULL;
-        }
-
-        // Checks
-        if (parsed->hour > 23) {
-            parsed->error = PARSER_INVALID_HOUR;
-
-            return NULL;
-        }
-
-        if (parsed->minute > 59) {
-            parsed->error = PARSER_INVALID_MINUTE;
-
-            return NULL;
-        }
-
-        if (parsed->second > 59) {
-            parsed->error = PARSER_INVALID_SECOND;
-
-            return NULL;
-        }
-
-        // Subsecond
-        if (*c == '.' || *c == ',') {
-            c++;
-
-            time = 0;
-            i = 0;
-            while (*c != '\0' && *c != 'Z' && *c != '+' && *c != '-') {
-                if (!(*c >= '0' && *c <='9')) {
-                    parsed->error = PARSER_INVALID_SUBSECOND;
-
-                    return NULL;
-                }
-
-                time = 10 * time + *c++ - '0';
-                i++;
-            }
-
-            // adjust to microseconds
-            if (i > 6) {
-                parsed->microsecond = time / pow(10, i - 6);
-            } else if (i <= 6) {
-                parsed->microsecond = time * pow(10, 6 - i);
-            }
-        }
-
-        // Timezone
-        if (*c == 'Z') {
-            parsed->has_offset = 1;
-            parsed->tzname = "UTC";
-            c++;
-        } else if (*c == '+' || *c == '-') {
-            tz_sign = 1;
-            if (*c == '-') {
-                tz_sign = -1;
-            }
-
-            parsed->has_offset = 1;
-            c++;
-
-            i = 0;
-            time = 0;
-            separators = 0;
-            while (*c != '\0') {
-                if (*c == ':') {
-                    separators++;
-                    c++;
-                    continue;
-                }
-
-                if (!(*c >= '0' && *c <= '9')) {
-                    parsed->error = PARSER_INVALID_TZ_OFFSET;
-
-                    return NULL;
-                }
-
-                time = 10 * time + *c++ - '0';
-                i++;
-            }
-
-            switch (i) {
-                case 2:
-                    // hh Format
-                    if (separators) {
-                        // Extraneous separators
-                        parsed->error = PARSER_INVALID_TZ_OFFSET;
-
-                        return NULL;
-                    }
-
-                    parsed->offset = tz_sign * (time * 3600);
-                    break;
-                case 4:
-                    // hhmm Format
-                    if (separators > 1) {
-                        // Extraneous separators
-                        parsed->error = PARSER_INVALID_TZ_OFFSET;
-
-                        return NULL;
-                    }
-
-                    parsed->offset = tz_sign * ((time / 100 * 3600) + (time % 100 * 60));
-                    break;
-                default:
-                    // Wrong format
-                    parsed->error = PARSER_INVALID_TZ_OFFSET;
-
-                    return NULL;
-            }
-        }
-    }
-
-    // At this point we should be at the end of the string
-    // If not, the string is invalid
-    if (*c != '\0') {
-        parsed->error = PARSER_INVALID_ISO8601;
-
-        return NULL;
-    }
-
-    return parsed;
-}
-
-
-Parsed* _parse_iso8601_duration(char *str, Parsed *parsed) {
-    char* c;
-    int value = 0;
-    int grabbed = 0;
-    int in_time = 0;
-    int in_fraction = 0;
-    int fraction_length = 0;
-    int has_fractional = 0;
-    int fraction = 0;
-    int has_ymd = 0;
-    int has_week = 0;
-    int has_month = 0;
-    int has_day = 0;
-    int has_hour = 0;
-    int has_minute = 0;
-    int has_second = 0;
-
-    c = str;
-
-    // Removing P operator
-    c++;
-
-    parsed->is_duration = 1;
-
-    for (; *c != '\0'; c++) {
-        switch (*c) {
-            case 'Y':
-                if (!grabbed || in_time || has_week || has_ymd) {
-                    // No value grabbed
-                    parsed->error = PARSER_INVALID_DURATION;
-
-                    return NULL;
-                }
-
-                if (fraction) {
-                    parsed->error = PARSER_INVALID_DURATION_FLOAT_YEAR_MONTH_NOT_SUPPORTED;
-
-                    return NULL;
-                }
-
-                parsed->years = value;
-
-                grabbed = 0;
-                value = 0;
-                fraction = 0;
-                in_fraction = 0;
-                has_ymd = 1;
-
-                break;
-            case 'M':
-                if (!grabbed || has_week) {
-                    // No value grabbed
-                    parsed->error = PARSER_INVALID_DURATION;
-
-                    return NULL;
-                }
-
-                if (in_time) {
-                    if (has_second) {
-                        parsed->error = PARSER_INVALID_DURATION;
-
-                        return NULL;
-                    }
-
-                    if (has_fractional) {
-                        parsed->error = PARSER_INVALID_DURATION;
-
-                        return NULL;
-                    }
-
-                    parsed->minutes = value;
-                    if (fraction) {
-                        parsed->seconds = fraction * 6;
-                        has_fractional = 1;
-                    }
-
-                    has_minute = 1;
-                } else {
-                    if (fraction) {
-                        parsed->error = PARSER_INVALID_DURATION_FLOAT_YEAR_MONTH_NOT_SUPPORTED;
-
-                        return NULL;
-                    }
-
-                    if (has_month || has_day) {
-                        parsed->error = PARSER_INVALID_DURATION;
-
-                        return NULL;
-                    }
-
-                    parsed->months = value;
-                    has_ymd = 1;
-                    has_month = 1;
-                }
-
-                grabbed = 0;
-                value = 0;
-                fraction = 0;
-                in_fraction = 0;
-
-                break;
-            case 'D':
-                if (!grabbed || in_time || has_week) {
-                    // No value grabbed
-                    parsed->error = PARSER_INVALID_DURATION;
-
-                    return NULL;
-                }
-
-                if (has_day) {
-                    parsed->error = PARSER_INVALID_DURATION;
-
-                    return NULL;
-                }
-
-                parsed->days = value;
-                if (fraction) {
-                    parsed->hours = fraction * 2.4;
-                    has_fractional = 1;
-                }
-
-                grabbed = 0;
-                value = 0;
-                fraction = 0;
-                in_fraction = 0;
-                has_ymd = 1;
-                has_day = 1;
-
-                break;
-            case 'T':
-                if (grabbed) {
-                    parsed->error = PARSER_INVALID_DURATION;
-
-                    return NULL;
-                }
-
-                in_time = 1;
-
-                break;
-            case 'H':
-                if (!grabbed || !in_time || has_week) {
-                    // No value grabbed
-                    parsed->error = PARSER_INVALID_DURATION;
-
-                    return NULL;
-                }
-
-                if (has_hour || has_second || has_minute) {
-                    parsed->error = PARSER_INVALID_DURATION;
-
-                    return NULL;
-                }
-
-                if (has_fractional) {
-                    parsed->error = PARSER_INVALID_DURATION;
-
-                    return NULL;
-                }
-
-                parsed->hours = value;
-                if (fraction) {
-                    parsed->minutes = fraction * 6;
-                    has_fractional = 1;
-                }
-
-                grabbed = 0;
-                value = 0;
-                fraction = 0;
-                in_fraction = 0;
-                has_hour = 1;
-
-                break;
-            case 'S':
-                if (!grabbed || !in_time || has_week) {
-                    // No value grabbed
-                    parsed->error = PARSER_INVALID_DURATION;
-
-                    return NULL;
-                }
-
-                if (has_second) {
-                    parsed->error = PARSER_INVALID_DURATION;
-
-                    return NULL;
-                }
-
-                if (has_fractional) {
-                    parsed->error = PARSER_INVALID_DURATION;
-
-                    return NULL;
-                }
-
-                if (fraction) {
-                    parsed->seconds = value;
-                    if (fraction_length > 6) {
-                        parsed->microseconds = fraction / pow(10, fraction_length - 6);
-                    } else {
-                        parsed->microseconds = fraction * pow(10, 6 - fraction_length);
-                    }
-                    has_fractional = 1;
-                } else {
-                    parsed->seconds = value;
-                }
-
-                grabbed = 0;
-                value = 0;
-                fraction = 0;
-                in_fraction = 0;
-                has_second = 1;
-
-                break;
-            case 'W':
-                if (!grabbed || in_time || has_ymd) {
-                    // No value grabbed
-                    parsed->error = PARSER_INVALID_DURATION;
-
-                    return NULL;
-                }
-
-                parsed->weeks = value;
-                if (fraction) {
-                    float days;
-                    days = fraction * 0.7;
-                    parsed->hours = (int) ((days - (int) days) * 24);
-                    parsed->days = (int) days;
-                }
-
-                grabbed = 0;
-                value = 0;
-                fraction = 0;
-                in_fraction = 0;
-                has_week = 1;
-
-                break;
-            case '.':
-                if (!grabbed || has_fractional) {
-                    // No value grabbed
-                    parsed->error = PARSER_INVALID_DURATION;
-
-                    return NULL;
-                }
-
-                in_fraction = 1;
-
-                break;
-            case ',':
-                if (!grabbed || has_fractional) {
-                    // No value grabbed
-                    parsed->error = PARSER_INVALID_DURATION;
-
-                    return NULL;
-                }
-
-                in_fraction = 1;
-
-                break;
-            default:
-                if (*c >= '0' && *c <='9') {
-                    if (in_fraction) {
-                        fraction = 10 * fraction + *c - '0';
-                        fraction_length++;
-                    } else {
-                        value = 10 * value + *c - '0';
-                        grabbed = 1;
-                    }
-                    break;
-                }
-
-                parsed->error = PARSER_INVALID_DURATION;
-
-                return NULL;
-        }
-    }
-
-    return parsed;
-}
-
-
-PyObject* parse_iso8601(PyObject *self, PyObject *args) {
-    char* str;
-    PyObject *obj;
-    PyObject *tzinfo;
-    Parsed *parsed = new_parsed();
-
-    if (!PyArg_ParseTuple(args, "s", &str)) {
-        PyErr_SetString(
-            PyExc_ValueError, "Invalid parameters"
-        );
-        free(parsed);
-        return NULL;
-    }
-
-    if (*str == 'P') {
-        // Duration (or interval)
-        if (_parse_iso8601_duration(str, parsed) == NULL) {
-            PyErr_SetString(
-                PyExc_ValueError, PARSER_ERRORS[parsed->error]
-            );
-
-            free(parsed);
-            return NULL;
-        }
-    } else if (_parse_iso8601_datetime(str, parsed) == NULL) {
-        PyErr_SetString(
-            PyExc_ValueError, PARSER_ERRORS[parsed->error]
-        );
-
-        free(parsed);
-        return NULL;
-    }
-
-    if (parsed->is_date) {
-        // Date only
-        if (parsed->ambiguous) {
-            // We can "safely" assume that the ambiguous
-            // date was actually a time in the form hhmmss
-            parsed->hour = parsed->year / 100;
-            parsed->minute = parsed->year % 100;
-            parsed->second = parsed->month;
-
-            obj = PyDateTimeAPI->Time_FromTime(
-                parsed->hour, parsed->minute, parsed->second, parsed->microsecond,
-                Py_BuildValue(""),
-                PyDateTimeAPI->TimeType
-            );
-        } else {
-            obj = PyDateTimeAPI->Date_FromDate(
-                parsed->year, parsed->month, parsed->day,
-                PyDateTimeAPI->DateType
-            );
-        }
-    } else if (parsed->is_datetime) {
-        if (!parsed->has_offset) {
-            tzinfo = Py_BuildValue("");
-        } else {
-            tzinfo = new_fixed_offset(parsed->offset, parsed->tzname);
-        }
-
-        obj = PyDateTimeAPI->DateTime_FromDateAndTime(
-            parsed->year,
-            parsed->month,
-            parsed->day,
-            parsed->hour,
-            parsed->minute,
-            parsed->second,
-            parsed->microsecond,
-            tzinfo,
-            PyDateTimeAPI->DateTimeType
-        );
-
-        Py_DECREF(tzinfo);
-    } else if (parsed->is_duration) {
-        obj = new_duration(
-            parsed->years, parsed->months, parsed->weeks, parsed->days,
-            parsed->hours, parsed->minutes, parsed->seconds, parsed->microseconds
-        );
-    } else {
-        free(parsed);
-        return NULL;
-    }
-
-    free(parsed);
-
-    return obj;
-}
-
-
-/* ------------------------------------------------------------------------- */
-
-static PyMethodDef helpers_methods[] = {
-    {
-        "parse_iso8601",
-        (PyCFunction) parse_iso8601,
-        METH_VARARGS,
-        PyDoc_STR("Parses a ISO8601 string into a tuple.")
-    },
-    {NULL}
-};
-
-
-/* ------------------------------------------------------------------------- */
-
-static struct PyModuleDef moduledef = {
-    PyModuleDef_HEAD_INIT,
-    "_iso8601",
-    NULL,
-    -1,
-    helpers_methods,
-    NULL,
-    NULL,
-    NULL,
-    NULL,
-};
-
-PyMODINIT_FUNC
-PyInit__iso8601(void)
-{
-    PyObject *module;
-
-    PyDateTime_IMPORT;
-
-    module = PyModule_Create(&moduledef);
-
-    if (module == NULL)
-        return NULL;
-
-    // FixedOffset declaration
-    FixedOffset_type.tp_new = PyType_GenericNew;
-    FixedOffset_type.tp_base = PyDateTimeAPI->TZInfoType;
-    FixedOffset_type.tp_methods = FixedOffset_methods;
-    FixedOffset_type.tp_members = FixedOffset_members;
-    FixedOffset_type.tp_init = (initproc)FixedOffset_init;
-
-    if (PyType_Ready(&FixedOffset_type) < 0)
-        return NULL;
-
-    // Duration declaration
-    Duration_type.tp_new = PyType_GenericNew;
-    Duration_type.tp_members = Duration_members;
-    Duration_type.tp_init = (initproc)Duration_init;
-
-    if (PyType_Ready(&Duration_type) < 0)
-        return NULL;
-
-    Py_INCREF(&FixedOffset_type);
-    Py_INCREF(&Duration_type);
-
-    PyModule_AddObject(module, "TZFixedOffset", (PyObject *)&FixedOffset_type);
-    PyModule_AddObject(module, "Duration", (PyObject *)&Duration_type);
-
-    return module;
-}
diff --git a/pendulum/parsing/_iso8601.pyi b/pendulum/parsing/_iso8601.pyi
deleted file mode 100644
index b9ce5d4..0000000
--- a/pendulum/parsing/_iso8601.pyi
+++ /dev/null
@@ -1,22 +0,0 @@
-from __future__ import annotations
-
-from datetime import date
-from datetime import datetime
-from datetime import time
-
-class Duration:
-
-    years: int = 0
-    months: int = 0
-    weeks: int = 0
-    days: int = 0
-    remaining_days: int = 0
-    hours: int = 0
-    minutes: int = 0
-    seconds: int = 0
-    remaining_seconds: int = 0
-    microseconds: int = 0
-
-def parse_iso8601(
-    text: str,
-) -> datetime | date | time | Duration: ...
diff --git a/pendulum/testing/traveller.py b/pendulum/testing/traveller.py
deleted file mode 100644
index 3c1d885..0000000
--- a/pendulum/testing/traveller.py
+++ /dev/null
@@ -1,139 +0,0 @@
-from __future__ import annotations
-
-from typing import TYPE_CHECKING
-from typing import cast
-
-from pendulum.datetime import DateTime
-from pendulum.utils._compat import PYPY
-
-if TYPE_CHECKING:
-    from types import TracebackType
-
-
-class BaseTraveller:
-    def __init__(self, datetime_class: type[DateTime] = DateTime) -> None:
-        self._datetime_class: type[DateTime] = datetime_class
-
-    def freeze(self: BaseTraveller) -> BaseTraveller:
-        raise NotImplementedError()
-
-    def travel_back(self: BaseTraveller) -> BaseTraveller:
-        raise NotImplementedError()
-
-    def travel(
-        self,
-        years: int = 0,
-        months: int = 0,
-        weeks: int = 0,
-        days: int = 0,
-        hours: int = 0,
-        minutes: int = 0,
-        seconds: int = 0,
-        microseconds: int = 0,
-    ) -> BaseTraveller:
-        raise NotImplementedError()
-
-    def travel_to(self, dt: DateTime) -> BaseTraveller:
-        raise NotImplementedError()
-
-
-if not PYPY:
-    import time_machine
-
-    class Traveller(BaseTraveller):
-        def __init__(self, datetime_class: type[DateTime] = DateTime) -> None:
-            super().__init__(datetime_class)
-
-            self._started: bool = False
-            self._traveller: time_machine.travel | None = None
-            self._coordinates: time_machine.Coordinates | None = None
-
-        def freeze(self) -> Traveller:
-            if self._started:
-                cast(time_machine.Coordinates, self._coordinates).move_to(
-                    self._datetime_class.now(), tick=False
-                )
-            else:
-                self._start(freeze=True)
-
-            return self
-
-        def travel_back(self) -> Traveller:
-            if not self._started:
-                return self
-
-            cast(time_machine.travel, self._traveller).stop()
-            self._coordinates = None
-            self._traveller = None
-            self._started = False
-
-            return self
-
-        def travel(
-            self,
-            years: int = 0,
-            months: int = 0,
-            weeks: int = 0,
-            days: int = 0,
-            hours: int = 0,
-            minutes: int = 0,
-            seconds: int = 0,
-            microseconds: int = 0,
-            *,
-            freeze: bool = False,
-        ) -> Traveller:
-            self._start(freeze=freeze)
-
-            cast(time_machine.Coordinates, self._coordinates).move_to(
-                self._datetime_class.now().add(
-                    years=years,
-                    months=months,
-                    weeks=weeks,
-                    days=days,
-                    hours=hours,
-                    minutes=minutes,
-                    seconds=seconds,
-                    microseconds=microseconds,
-                )
-            )
-
-            return self
-
-        def travel_to(self, dt: DateTime, *, freeze: bool = False) -> Traveller:
-            self._start(freeze=freeze)
-
-            cast(time_machine.Coordinates, self._coordinates).move_to(dt)
-
-            return self
-
-        def _start(self, freeze: bool = False) -> None:
-            if self._started:
-                return
-
-            if not self._traveller:
-                self._traveller = time_machine.travel(
-                    self._datetime_class.now(), tick=not freeze
-                )
-
-            self._coordinates = self._traveller.start()
-
-            self._started = True
-
-        def __enter__(self) -> Traveller:
-            self._start()
-
-            return self
-
-        def __exit__(
-            self,
-            exc_type: type[BaseException] | None,
-            exc_val: BaseException | None,
-            exc_tb: TracebackType,
-        ) -> None:
-            self.travel_back()
-
-else:
-
-    class Traveller(BaseTraveller):  # type: ignore[no-redef]
-
-        ...
diff --git a/pendulum/utils/_compat.py b/pendulum/utils/_compat.py
deleted file mode 100644
index 8f32f9e..0000000
--- a/pendulum/utils/_compat.py
+++ /dev/null
@@ -1,13 +0,0 @@
-from __future__ import annotations
-
-import sys
-
-PYPY = hasattr(sys, "pypy_version_info")
-PY38 = sys.version_info[:2] >= (3, 8)
-
-try:
-    from backports import zoneinfo
-except ImportError:
-    import zoneinfo  # type: ignore[no-redef]
-
-__all__ = ["zoneinfo"]
diff --git a/poetry.lock b/poetry.lock
index 03a2975..b792b1d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,161 +1,261 @@
-# This file is automatically @generated by Poetry and should not be changed by hand.
-
-[[package]]
-name = "atomicwrites"
-version = "1.4.1"
-description = "Atomic file writes."
-category = "dev"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-
-[[package]]
-name = "attrs"
-version = "22.1.0"
-description = "Classes Without Boilerplate"
-category = "dev"
-optional = false
-python-versions = ">=3.5"
-
-[package.extras]
-dev = ["cloudpickle", "coverage[toml] (>=5.0.2)", "furo", "hypothesis", "mypy (>=0.900,!=0.940)", "pre-commit", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "sphinx", "sphinx-notfound-page", "zope.interface"]
-docs = ["furo", "sphinx", "sphinx-notfound-page", "zope.interface"]
-tests = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy (>=0.900,!=0.940)", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "zope.interface"]
-tests_no_zope = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy (>=0.900,!=0.940)", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins"]
+# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
 
 [[package]]
 name = "babel"
-version = "2.10.3"
+version = "2.14.0"
 description = "Internationalization utilities"
-category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.7"
+files = [
+    {file = "Babel-2.14.0-py3-none-any.whl", hash = "sha256:efb1a25b7118e67ce3a259bed20545c29cb68be8ad2c784c83689981b7a57287"},
+    {file = "Babel-2.14.0.tar.gz", hash = "sha256:6919867db036398ba21eb5c7a0f6b28ab8cbc3ae7a73a44ebe34ae74a4e7d363"},
+]
 
 [package.dependencies]
-pytz = ">=2015.7"
+pytz = {version = ">=2015.7", markers = "python_version < \"3.9\""}
+
+[package.extras]
+dev = ["freezegun (>=1.0,<2.0)", "pytest (>=6.0)", "pytest-cov"]
 
 [[package]]
 name = "backports-zoneinfo"
 version = "0.2.1"
 description = "Backport of the standard library zoneinfo module"
-category = "main"
 optional = false
 python-versions = ">=3.6"
+files = [
+    {file = "backports.zoneinfo-0.2.1-cp36-cp36m-macosx_10_14_x86_64.whl", hash = "sha256:da6013fd84a690242c310d77ddb8441a559e9cb3d3d59ebac9aca1a57b2e18bc"},
+    {file = "backports.zoneinfo-0.2.1-cp36-cp36m-manylinux1_i686.whl", hash = "sha256:89a48c0d158a3cc3f654da4c2de1ceba85263fafb861b98b59040a5086259722"},
+    {file = "backports.zoneinfo-0.2.1-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:1c5742112073a563c81f786e77514969acb58649bcdf6cdf0b4ed31a348d4546"},
+    {file = "backports.zoneinfo-0.2.1-cp36-cp36m-win32.whl", hash = "sha256:e8236383a20872c0cdf5a62b554b27538db7fa1bbec52429d8d106effbaeca08"},
+    {file = "backports.zoneinfo-0.2.1-cp36-cp36m-win_amd64.whl", hash = "sha256:8439c030a11780786a2002261569bdf362264f605dfa4d65090b64b05c9f79a7"},
+    {file = "backports.zoneinfo-0.2.1-cp37-cp37m-macosx_10_14_x86_64.whl", hash = "sha256:f04e857b59d9d1ccc39ce2da1021d196e47234873820cbeaad210724b1ee28ac"},
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 [package.dependencies]
 colorama = {version = "*", markers = "platform_system == \"Windows\""}
-importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 
 [[package]]
 name = "colorama"
-version = "0.4.5"
+version = "0.4.6"
 description = "Cross-platform colored terminal text."
-category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-
-[[package]]
-name = "coverage"
-version = "6.4.2"
-description = "Code coverage measurement for Python"
-category = "dev"
-optional = false
-python-versions = ">=3.7"
-
-[package.dependencies]
-tomli = {version = "*", optional = true, markers = "python_full_version <= \"3.11.0a6\" and extra == \"toml\""}
-
-[package.extras]
-toml = ["tomli"]
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
+files = [
+    {file = "colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6"},
+    {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
+]
 
 [[package]]
 name = "crashtest"
-version = "0.3.1"
+version = "0.4.1"
 description = "Manage Python errors with ease"
-category = "dev"
 optional = false
-python-versions = ">=3.6,<4.0"
+python-versions = ">=3.7,<4.0"
+files = [
+    {file = "crashtest-0.4.1-py3-none-any.whl", hash = "sha256:8d23eac5fa660409f57472e3851dab7ac18aba459a8d19cbbba86d3d5aecd2a5"},
+    {file = "crashtest-0.4.1.tar.gz", hash = "sha256:80d7b1f316ebfbd429f648076d6275c877ba30ba48979de4191714a75266f0ce"},
+]
 
 [[package]]
 name = "distlib"
-version = "0.3.5"
+version = "0.3.8"
 description = "Distribution utilities"
-category = "dev"
 optional = false
 python-versions = "*"
+files = [
+    {file = "distlib-0.3.8-py2.py3-none-any.whl", hash = "sha256:034db59a0b96f8ca18035f36290806a9a6e6bd9d1ff91e45a7f172eb17e51784"},
+    {file = "distlib-0.3.8.tar.gz", hash = "sha256:1530ea13e350031b6312d8580ddb6b27a104275a31106523b8f123787f494f64"},
+]
+
+[[package]]
+name = "exceptiongroup"
+version = "1.2.0"
+description = "Backport of PEP 654 (exception groups)"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "exceptiongroup-1.2.0-py3-none-any.whl", hash = "sha256:4bfd3996ac73b41e9b9628b04e079f193850720ea5945fc96a08633c66912f14"},
+    {file = "exceptiongroup-1.2.0.tar.gz", hash = "sha256:91f5c769735f051a4290d52edd0858999b57e5876e9f85937691bd4c9fa3ed68"},
+]
+
+[package.extras]
+test = ["pytest (>=6)"]
 
 [[package]]
 name = "filelock"
-version = "3.7.1"
+version = "3.13.1"
 description = "A platform independent file lock."
-category = "dev"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
+files = [
+    {file = "filelock-3.13.1-py3-none-any.whl", hash = "sha256:57dbda9b35157b05fb3e58ee91448612eb674172fab98ee235ccb0b5bee19a1c"},
+    {file = "filelock-3.13.1.tar.gz", hash = "sha256:521f5f56c50f8426f5e03ad3b281b490a87ef15bc6c526f168290f0c7148d44e"},
+]
 
 [package.extras]
-docs = ["furo (>=2021.8.17b43)", "sphinx (>=4.1)", "sphinx-autodoc-typehints (>=1.12)"]
-testing = ["covdefaults (>=1.2.0)", "coverage (>=4)", "pytest (>=4)", "pytest-cov", "pytest-timeout (>=1.4.2)"]
+docs = ["furo (>=2023.9.10)", "sphinx (>=7.2.6)", "sphinx-autodoc-typehints (>=1.24)"]
+testing = ["covdefaults (>=2.3)", "coverage (>=7.3.2)", "diff-cover (>=8)", "pytest (>=7.4.3)", "pytest-cov (>=4.1)", "pytest-mock (>=3.12)", "pytest-timeout (>=2.2)"]
+typing = ["typing-extensions (>=4.8)"]
 
 [[package]]
 name = "ghp-import"
 version = "2.1.0"
 description = "Copy your docs directly to the gh-pages branch."
-category = "dev"
 optional = false
 python-versions = "*"
+files = [
+    {file = "ghp-import-2.1.0.tar.gz", hash = "sha256:9c535c4c61193c2df8871222567d7fd7e5014d835f97dc7b7439069e2413d343"},
+    {file = "ghp_import-2.1.0-py3-none-any.whl", hash = "sha256:8337dd7b50877f163d4c0289bc1f1c7f127550241988d568c1db512c4324a619"},
+]
 
 [package.dependencies]
 python-dateutil = ">=2.8.1"
@@ -165,76 +265,76 @@ dev = ["flake8", "markdown", "twine", "wheel"]
 
 [[package]]
 name = "identify"
-version = "2.5.3"
+version = "2.5.33"
 description = "File identification library for Python"
-category = "dev"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
+files = [
+    {file = "identify-2.5.33-py2.py3-none-any.whl", hash = "sha256:d40ce5fcd762817627670da8a7d8d8e65f24342d14539c59488dc603bf662e34"},
+    {file = "identify-2.5.33.tar.gz", hash = "sha256:161558f9fe4559e1557e1bff323e8631f6a0e4837f7497767c1782832f16b62d"},
+]
 
 [package.extras]
 license = ["ukkonen"]
 
 [[package]]
 name = "importlib-metadata"
-version = "4.12.0"
+version = "7.0.0"
 description = "Read metadata from Python packages"
-category = "dev"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
+files = [
+    {file = "importlib_metadata-7.0.0-py3-none-any.whl", hash = "sha256:d97503976bb81f40a193d41ee6570868479c69d5068651eb039c40d850c59d67"},
+    {file = "importlib_metadata-7.0.0.tar.gz", hash = "sha256:7fc841f8b8332803464e5dc1c63a2e59121f46ca186c0e2e182e80bf8c1319f7"},
+]
 
 [package.dependencies]
-typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
 zipp = ">=0.5"
 
 [package.extras]
-docs = ["jaraco.packaging (>=9)", "rst.linker (>=1.9)", "sphinx"]
+docs = ["furo", "jaraco.packaging (>=9.3)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (<7.2.5)", "sphinx (>=3.5)", "sphinx-lint"]
 perf = ["ipython"]
-testing = ["flufl.flake8", "importlib-resources (>=1.3)", "packaging", "pyfakefs", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)", "pytest-perf (>=0.9.2)"]
+testing = ["flufl.flake8", "importlib-resources (>=1.3)", "packaging", "pyfakefs", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=2.2)", "pytest-mypy (>=0.9.1)", "pytest-perf (>=0.9.2)", "pytest-ruff"]
 
 [[package]]
 name = "importlib-resources"
-version = "5.9.0"
+version = "6.1.1"
 description = "Read resources from Python packages"
-category = "main"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
+files = [
+    {file = "importlib_resources-6.1.1-py3-none-any.whl", hash = "sha256:e8bf90d8213b486f428c9c39714b920041cb02c184686a3dee24905aaa8105d6"},
+    {file = "importlib_resources-6.1.1.tar.gz", hash = "sha256:3893a00122eafde6894c59914446a512f728a0c1a45f9bb9b63721b6bacf0b4a"},
+]
 
 [package.dependencies]
 zipp = {version = ">=3.1.0", markers = "python_version < \"3.10\""}
 
 [package.extras]
-docs = ["jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx"]
-testing = ["pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)"]
+docs = ["furo", "jaraco.packaging (>=9.3)", "jaraco.tidelift (>=1.4)", "rst.linker (>=1.9)", "sphinx (<7.2.5)", "sphinx (>=3.5)", "sphinx-lint"]
+testing = ["pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=2.2)", "pytest-mypy (>=0.9.1)", "pytest-ruff", "zipp (>=3.17)"]
 
 [[package]]
 name = "iniconfig"
-version = "1.1.1"
-description = "iniconfig: brain-dead simple config-ini parsing"
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "isort"
-version = "5.10.1"
-description = "A Python utility / library to sort Python imports."
-category = "dev"
+version = "2.0.0"
+description = "brain-dead simple config-ini parsing"
 optional = false
-python-versions = ">=3.6.1,<4.0"
-
-[package.extras]
-colors = ["colorama (>=0.4.3,<0.5.0)"]
-pipfile_deprecated_finder = ["pipreqs", "requirementslib"]
-plugins = ["setuptools"]
-requirements_deprecated_finder = ["pip-api", "pipreqs"]
+python-versions = ">=3.7"
+files = [
+    {file = "iniconfig-2.0.0-py3-none-any.whl", hash = "sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374"},
+    {file = "iniconfig-2.0.0.tar.gz", hash = "sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3"},
+]
 
 [[package]]
 name = "jinja2"
 version = "3.1.2"
 description = "A very fast and expressive template engine."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
+files = [
+    {file = "Jinja2-3.1.2-py3-none-any.whl", hash = "sha256:6088930bfe239f0e6710546ab9c19c9ef35e29792895fed6e6e31a023a182a61"},
+    {file = "Jinja2-3.1.2.tar.gz", hash = "sha256:31351a702a408a9e7595a8fc6150fc3f43bb6bf7e319770cbc0db9df9437e852"},
+]
 
 [package.dependencies]
 MarkupSafe = ">=2.0"
@@ -244,152 +344,288 @@ i18n = ["Babel (>=2.7)"]
 
 [[package]]
 name = "markdown"
-version = "3.4.1"
-description = "Python implementation of Markdown."
-category = "dev"
+version = "3.5.1"
+description = "Python implementation of John Gruber's Markdown."
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
+files = [
+    {file = "Markdown-3.5.1-py3-none-any.whl", hash = "sha256:5874b47d4ee3f0b14d764324d2c94c03ea66bee56f2d929da9f2508d65e722dc"},
+    {file = "Markdown-3.5.1.tar.gz", hash = "sha256:b65d7beb248dc22f2e8a31fb706d93798093c308dc1aba295aedeb9d41a813bd"},
+]
 
 [package.dependencies]
 importlib-metadata = {version = ">=4.4", markers = "python_version < \"3.10\""}
 
 [package.extras]
+docs = ["mdx-gh-links (>=0.2)", "mkdocs (>=1.5)", "mkdocs-gen-files", "mkdocs-literate-nav", "mkdocs-nature (>=0.6)", "mkdocs-section-index", "mkdocstrings[python]"]
 testing = ["coverage", "pyyaml"]
 
 [[package]]
 name = "markdown-include"
-version = "0.5.1"
-description = "This is an extension to Python-Markdown which provides an \"include\" function, similar to that found in LaTeX (and also the C pre-processor and Fortran). I originally wrote it for my FORD Fortran auto-documentation generator."
-category = "dev"
+version = "0.8.1"
+description = "A Python-Markdown extension which provides an 'include' function"
 optional = false
-python-versions = "*"
+python-versions = ">=3.7"
+files = [
+    {file = "markdown-include-0.8.1.tar.gz", hash = "sha256:1d0623e0fc2757c38d35df53752768356162284259d259c486b4ab6285cdbbe3"},
+    {file = "markdown_include-0.8.1-py3-none-any.whl", hash = "sha256:32f0635b9cfef46997b307e2430022852529f7a5b87c0075c504283e7cc7db53"},
+]
 
 [package.dependencies]
-markdown = "*"
+markdown = ">=3.0"
+
+[package.extras]
+tests = ["pytest"]
 
 [[package]]
 name = "markupsafe"
-version = "2.1.1"
+version = "2.1.3"
 description = "Safely add untrusted strings to HTML/XML markup."
-category = "dev"
 optional = false
 python-versions = ">=3.7"
+files = [
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+    {file = "pluggy-1.3.0-py3-none-any.whl", hash = "sha256:d89c696a773f8bd377d18e5ecda92b7a3793cbe66c87060a6fb58c7b6e1061f7"},
+    {file = "pluggy-1.3.0.tar.gz", hash = "sha256:cf61ae8f126ac6f7c451172cf30e3e43d3ca77615509771b3a984a0730651e12"},
+]
 
 [package.extras]
 dev = ["pre-commit", "tox"]
@@ -397,776 +633,612 @@ testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
 name = "pre-commit"
-version = "2.20.0"
+version = "3.5.0"
 description = "A framework for managing and maintaining multi-language pre-commit hooks."
-category = "dev"
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.8"
+files = [
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+    {file = "pre_commit-3.5.0.tar.gz", hash = "sha256:5804465c675b659b0862f07907f96295d490822a450c4c40e747d0b1c6ebcb32"},
+]
 
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 cfgv = ">=2.0.0"
 identify = ">=1.0.0"
-importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 nodeenv = ">=0.11.1"
 pyyaml = ">=5.1"
-toml = "*"
-virtualenv = ">=20.0.8"
+virtualenv = ">=20.10.0"
 
 [[package]]
-name = "py"
-version = "1.11.0"
-description = "library with cross-python path, ini-parsing, io, code, log facilities"
-category = "dev"
+name = "py-cpuinfo"
+version = "9.0.0"
+description = "Get CPU info with pure Python"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = "*"
+files = [
+    {file = "py-cpuinfo-9.0.0.tar.gz", hash = "sha256:3cdbbf3fac90dc6f118bfd64384f309edeadd902d7c8fb17f02ffa1fc3f49690"},
+    {file = "py_cpuinfo-9.0.0-py3-none-any.whl", hash = "sha256:859625bc251f64e21f077d099d4162689c762b5d6a4c3c97553d56241c9674d5"},
+]
 
 [[package]]
-name = "pygments"
-version = "2.12.0"
-description = "Pygments is a syntax highlighting package written in Python."
-category = "dev"
+name = "pycparser"
+version = "2.21"
+description = "C parser in Python"
 optional = false
-python-versions = ">=3.6"
+python-versions = "*"
+files = [
+    {file = "pycparser-2.21-py2.py3-none-any.whl", hash = "sha256:8ee45429555515e1f6b185e78100aea234072576aa43ab53aefcae078162fca9"},
+    {file = "pycparser-2.21.tar.gz", hash = "sha256:e644fdec12f7872f86c58ff790da456218b10f863970249516d60a5eaca77206"},
+]
 
 [[package]]
-name = "pylev"
-version = "1.4.0"
-description = "A pure Python Levenshtein implementation that's not freaking GPL'd."
-category = "dev"
+name = "pygments"
+version = "2.17.2"
+description = "Pygments is a syntax highlighting package written in Python."
 optional = false
-python-versions = "*"
+python-versions = ">=3.7"
+files = [
+    {file = "pygments-2.17.2-py3-none-any.whl", hash = "sha256:b27c2826c47d0f3219f29554824c30c5e8945175d888647acd804ddd04af846c"},
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+]
+
+[package.extras]
+plugins = ["importlib-metadata"]
+windows-terminal = ["colorama (>=0.4.6)"]
 
 [[package]]
 name = "pymdown-extensions"
-version = "6.3"
+version = "10.5"
 description = "Extension pack for Python Markdown."
-category = "dev"
 optional = false
-python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
+python-versions = ">=3.8"
+files = [
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+    {file = "pymdown_extensions-10.5.tar.gz", hash = "sha256:1b60f1e462adbec5a1ed79dac91f666c9c0d241fa294de1989f29d20096cfd0b"},
+]
 
 [package.dependencies]
-Markdown = ">=3.2"
+markdown = ">=3.5"
+pyyaml = "*"
+
+[package.extras]
+extra = ["pygments (>=2.12)"]
 
 [[package]]
-name = "pyparsing"
-version = "3.0.9"
-description = "pyparsing module - Classes and methods to define and execute parsing grammars"
-category = "dev"
+name = "pyproject-api"
+version = "1.6.1"
+description = "API to interact with the python pyproject.toml based projects"
 optional = false
-python-versions = ">=3.6.8"
+python-versions = ">=3.8"
+files = [
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+]
+
+[package.dependencies]
+packaging = ">=23.1"
+tomli = {version = ">=2.0.1", markers = "python_version < \"3.11\""}
 
 [package.extras]
-diagrams = ["jinja2", "railroad-diagrams"]
+docs = ["furo (>=2023.8.19)", "sphinx (<7.2)", "sphinx-autodoc-typehints (>=1.24)"]
+testing = ["covdefaults (>=2.3)", "pytest (>=7.4)", "pytest-cov (>=4.1)", "pytest-mock (>=3.11.1)", "setuptools (>=68.1.2)", "wheel (>=0.41.2)"]
 
 [[package]]
 name = "pytest"
-version = "7.1.2"
+version = "7.4.3"
 description = "pytest: simple powerful testing with Python"
-category = "dev"
 optional = false
 python-versions = ">=3.7"
+files = [
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+]
 
 [package.dependencies]
-atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
-attrs = ">=19.2.0"
 colorama = {version = "*", markers = "sys_platform == \"win32\""}
-importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+exceptiongroup = {version = ">=1.0.0rc8", markers = "python_version < \"3.11\""}
 iniconfig = "*"
 packaging = "*"
 pluggy = ">=0.12,<2.0"
-py = ">=1.8.2"
-tomli = ">=1.0.0"
+tomli = {version = ">=1.0.0", markers = "python_version < \"3.11\""}
 
 [package.extras]
-testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "xmlschema"]
+testing = ["argcomplete", "attrs (>=19.2.0)", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "setuptools", "xmlschema"]
 
 [[package]]
-name = "pytest-cov"
-version = "3.0.0"
-description = "Pytest plugin for measuring coverage."
-category = "dev"
+name = "pytest-benchmark"
+version = "4.0.0"
+description = "A ``pytest`` fixture for benchmarking code. It will group the tests into rounds that are calibrated to the chosen timer."
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.7"
+files = [
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+]
+
+[package.dependencies]
+py-cpuinfo = "*"
+pytest = ">=3.8"
+
+[package.extras]
+aspect = ["aspectlib"]
+elasticsearch = ["elasticsearch"]
+histogram = ["pygal", "pygaljs"]
+
+[[package]]
+name = "pytest-codspeed"
+version = "1.2.2"
+description = "Pytest plugin to create CodSpeed benchmarks"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "pytest_codspeed-1.2.2-py3-none-any.whl", hash = "sha256:b8971152556e90900ae9bb8135b268592c9f3c9450974a2468a5e17f21d59ec1"},
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+]
 
 [package.dependencies]
-coverage = {version = ">=5.2.1", extras = ["toml"]}
-pytest = ">=4.6"
+cffi = ">=1.15.1,<1.16.0"
+pytest = ">=3.8"
 
 [package.extras]
-testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtualenv"]
+compatibility = ["pytest-benchmarks (>=3.4.1,<3.5.0)"]
+dev = ["black (>=22.3.0,<22.4.0)", "flake8 (>=5.0.4,<5.1.0)", "hatchling (>=1.11.1,<1.12.0)", "isort (>=5.8.0,<5.9.0)", "mypy (>=0.961,<1.0)", "pytest (>=7.0,<8.0)", "pytest-cov (>=4.0.0,<4.1.0)", "ruff (>=0.0.100,<0.1.0)"]
 
 [[package]]
 name = "python-dateutil"
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 description = "Extensions to the standard Python datetime module"
-category = "main"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
+files = [
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 [package.dependencies]
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 [[package]]
 name = "pytz"
-version = "2022.1"
+version = "2023.3.post1"
 description = "World timezone definitions, modern and historical"
-category = "dev"
 optional = false
 python-versions = "*"
+files = [
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+]
 
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-    {file = "typed_ast-1.5.4.tar.gz", hash = "sha256:39e21ceb7388e4bb37f4c679d72707ed46c2fbf2a5609b8b8ebc4b067d977df2"},
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-    {file = "types_backports-0.1.3-py2.py3-none-any.whl", hash = "sha256:dafcd61848081503e738a7768872d1dd6c018401b4d2a1cfb608ea87ec9864b9"},
-]
-types-python-dateutil = [
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-]
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-    {file = "typing_extensions-4.3.0.tar.gz", hash = "sha256:e6d2677a32f47fc7eb2795db1dd15c1f34eff616bcaf2cfb5e997f854fa1c4a6"},
-]
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-    {file = "tzdata-2022.1-py2.py3-none-any.whl", hash = "sha256:238e70234214138ed7b4e8a0fab0e5e13872edab3be586ab8198c407620e2ab9"},
-    {file = "tzdata-2022.1.tar.gz", hash = "sha256:8b536a8ec63dc0751342b3984193a3118f8fca2afe25752bb9b7fffd398552d3"},
-]
-virtualenv = [
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-    {file = "virtualenv-20.16.3.tar.gz", hash = "sha256:d86ea0bb50e06252d79e6c241507cb904fcd66090c3271381372d6221a3970f9"},
-]
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-    {file = "watchdog-2.1.9.tar.gz", hash = "sha256:43ce20ebb36a51f21fa376f76d1d4692452b2527ccd601950d69ed36b9e21609"},
-]
-zipp = [
-    {file = "zipp-3.8.1-py3-none-any.whl", hash = "sha256:47c40d7fe183a6f21403a199b3e4192cca5774656965b0a4988ad2f8feb5f009"},
-    {file = "zipp-3.8.1.tar.gz", hash = "sha256:05b45f1ee8f807d0cc928485ca40a07cb491cf092ff587c0df9cb1fd154848d2"},
-]
+[metadata]
+lock-version = "2.0"
+python-versions = ">=3.8"
+content-hash = "8df704933b8ad4ffb92d760c1215dfe15be3227a5d65d93f3a5cac8a2035565d"
diff --git a/pyproject.toml b/pyproject.toml
index a61cae0..497dcfb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,40 @@
+[project]
+name = "pendulum"
+version = "3.0.0"
+description = "Python datetimes made easy"
+readme = "README.rst"
+requires-python = ">=3.8"
+license = { text = "MIT License" }
+authors = [{ name = "Sébastien Eustace", email = "sebastien@eustace.io>" }]
+keywords = ['datetime', 'date', 'time']
+
+classifiers = [
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+]
+
+dependencies = [
+    "python-dateutil>=2.6",
+    "tzdata>=2020.1",
+    'backports.zoneinfo>=0.2.1; python_version < "3.9"',
+    'time-machine>=2.6.0; implementation_name != "pypy"',
+    'importlib-resources>=5.9.0; python_version < "3.9"'
+]
+
+[project.urls]
+Homepage = "https://pendulum.eustace.io"
+Documentation = "https://pendulum.eustace.io/docs"
+Repository = "https://github.com/sdispater/pendulum"
+
+
 [tool.poetry]
 name = "pendulum"
-version = "3.0.0a1"
+version = "3.0.0b1"
 description = "Python datetimes made easy"
 authors = ["Sébastien Eustace <sebastien@eustace.io>"]
 license = "MIT"
@@ -10,90 +44,119 @@ repository = "https://github.com/sdispater/pendulum"
 documentation = "https://pendulum.eustace.io/docs"
 keywords = ['datetime', 'date', 'time']
 
-packages = [
-    { include = "pendulum" },
-    { include = "tests", format = "sdist" },
-]
-include = [
-    { path = "meson.build", format = "sdist" },
-    { path = "pendulum/py.typed" },
-    # C extensions must be included in the wheel distributions
-    { path = "pendulum/_extensions/*.so", format = "wheel" },
-    { path = "pendulum/_extensions/*.pyd", format = "wheel" },
-    { path = "pendulum/parsing/*.so", format = "wheel" },
-    { path = "pendulum/parsing/*.pyd", format = "wheel" },
-]
-
 
 [tool.poetry.dependencies]
-python = "^3.7"
-python-dateutil = "^2.6"
-"backports.zoneinfo" = { version = "^0.2.1", python = ">=3.7,<3.9" }
-time-machine = { version = "^2.6.0", markers = "implementation_name != 'pypy'" }
+python = ">=3.8"
+python-dateutil = ">=2.6"
+"backports.zoneinfo" = { version = ">=0.2.1", python = "<3.9" }
+time-machine = { version = ">=2.6.0", markers = "implementation_name != 'pypy'", optional = true }
 tzdata = ">=2020.1"
-importlib-resources = { version = "^5.9.0", python = ">=3.7,<3.9" }
+importlib-resources = { version = ">=5.9.0", python = "<3.9" }
 
 [tool.poetry.group.test.dependencies]
 pytest = "^7.1.2"
-pytest-cov = "^3.0.0"
 pytz = ">=2022.1"
-time-machine = "^2.7.1"
+time-machine = ">=2.6.0"
+pytest-benchmark = "^4.0.0"
 
 [tool.poetry.group.doc.dependencies]
 mkdocs = "^1.0"
-pymdown-extensions = "^6.0"
+pymdown-extensions = ">=6,<11"
 pygments = "^2.2"
-markdown-include = "^0.5.1"
+markdown-include = "^0.8.1"
 
 [tool.poetry.group.lint.dependencies]
-black = { version = "^22.6.0", markers = "implementation_name != 'pypy'" }
-isort = "^5.10.1"
-pre-commit = "^2.20.0"
-types-backports = "^0.1.3"
+pre-commit = "^3.0.0"
+
+[tool.poetry.group.typing.dependencies]
+mypy = "^1.3.0"
 types-python-dateutil = "^2.8.19"
+types-pytz = ">=2022.7.1.2"
 
 [tool.poetry.group.dev.dependencies]
 babel = "^2.10.3"
-cleo = "^1.0.0a5"
-tox = "^3.25.1"
+cleo = { version = "^2.0.1", python = ">=3.8,<4.0" }
+tox = "^4.0.0"
 
-[tool.poetry.group.build]
-optional = true
+[tool.poetry.group.benchmark.dependencies]
+pytest-codspeed = "^1.2.2"
 
 [tool.poetry.group.build.dependencies]
-meson = "^0.63.2"
-ninja = "^1.10.2.3"
-
-[tool.poetry.build]
-generate-setup-file = false
-script = "build.py"
-
-[tool.isort]
-profile = "black"
-force_single_line = true
-atomic = true
-lines_after_imports = -1
-lines_between_types = 1
-skip_glob = [
-    "pendulum/locales/**",
-    "build.py",
-    "pendulum/__version__.py",
+maturin = ">=1.0,<2.0"
+
+[tool.poetry.extras]
+test = ["time-machine"]
+
+[tool.maturin]
+module-name = "pendulum._pendulum"
+
+
+[tool.ruff]
+fix = true
+unfixable = [
+    "ERA", # do not autoremove commented out code
+]
+target-version = "py38"
+line-length = 88
+extend-select = [
+    "B", # flake8-bugbear
+    "C4", # flake8-comprehensions
+    "ERA", # flake8-eradicate/eradicate
+    "I", # isort
+    "N", # pep8-naming
+    "PIE", # flake8-pie
+    "PGH", # pygrep
+    "RUF", # ruff checks
+    "SIM", # flake8-simplify
+    "TCH", # flake8-type-checking
+    "TID", # flake8-tidy-imports
+    "UP", # pyupgrade
 ]
-filter_files = true
-known_first_party = "pendulum"
-known_third_party = [
+ignore = [
+    "B904", # use 'raise ... from err'
+    "B905", # use explicit 'strict=' parameter with 'zip()'
+    "N818", #  Exception name should be named with an Error suffix
+    "RUF001",
+]
+extend-exclude = [
+    # External to the project's coding standards:
+    "docs/*",
+    # Machine-generated, too many false-positives
+    "src/pendulum/locales/*",
+    # ruff disagrees with black when it comes to formatting
+    "*.pyi",
+]
+
+[tool.ruff.flake8-tidy-imports]
+ban-relative-imports = "all"
+
+[tool.ruff.isort]
+force-single-line = true
+lines-between-types = 1
+lines-after-imports = 2
+known-first-party = ["pendulum"]
+known-third-party = [
     "babel",
     "cleo",
     "dateutil",
     "time_machine",
     "pytzdata",
 ]
+required-imports = ["from __future__ import annotations"]
+
+[tool.ruff.extend-per-file-ignores]
+"build.py" = ["I002"]
+"clock" = ["RUF012"]
 
 [tool.mypy]
 strict = true
-files = "pendulum, tests"
+files = "src, tests"
 show_error_codes = true
 pretty = true
+warn_unused_ignores = true
+exclude = [
+    "^build\\.py$"
+]
 
 # The following whitelist is used to allow for incremental adoption
 # of Mypy. Modules should be removed from this whitelist as and when
@@ -103,9 +166,6 @@ pretty = true
 [[tool.mypy.overrides]]
 module = [
     "pendulum.mixins.default",
-    "tests.conftest",
-    "tests.test_helpers",
-    "tests.test_main",
     "tests.test_parsing",
     "tests.date.test_add",
     "tests.date.test_behavior",
@@ -179,5 +239,5 @@ omit = [
 ]
 
 [build-system]
-requires = ["poetry-core>=1.1.0a6", "meson", "ninja"]
-build-backend = "poetry.core.masonry.api"
+requires = ["maturin>=1.0,<2.0"]
+build-backend = "maturin"
diff --git a/rust/.cargo/config.toml b/rust/.cargo/config.toml
new file mode 100644
index 0000000..f0ba8af
--- /dev/null
+++ b/rust/.cargo/config.toml
@@ -0,0 +1,15 @@
+[build]
+rustflags = []
+
+# see https://pyo3.rs/main/building_and_distribution.html#macos
+[target.x86_64-apple-darwin]
+rustflags = [
+  "-C", "link-arg=-undefined",
+  "-C", "link-arg=dynamic_lookup",
+]
+
+[target.aarch64-apple-darwin]
+rustflags = [
+  "-C", "link-arg=-undefined",
+  "-C", "link-arg=dynamic_lookup",
+]
diff --git a/rust/Cargo.lock b/rust/Cargo.lock
new file mode 100644
index 0000000..bcfe643
--- /dev/null
+++ b/rust/Cargo.lock
@@ -0,0 +1,318 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "_pendulum"
+version = "3.0.0-beta-1"
+dependencies = [
+ "mimalloc",
+ "pyo3",
+]
+
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
+[[package]]
+name = "cc"
+version = "1.0.79"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "indoc"
+version = "1.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfa799dd5ed20a7e349f3b4639aa80d74549c81716d9ec4f994c9b5815598306"
+
+[[package]]
+name = "libc"
+version = "0.2.139"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
+
+[[package]]
+name = "libmimalloc-sys"
+version = "0.1.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3979b5c37ece694f1f5e51e7ecc871fdb0f517ed04ee45f88d15d6d553cb9664"
+dependencies = [
+ "cc",
+ "libc",
+]
+
+[[package]]
+name = "lock_api"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "435011366fe56583b16cf956f9df0095b405b82d76425bc8981c0e22e60ec4df"
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+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
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diff --git a/rust/Cargo.toml b/rust/Cargo.toml
new file mode 100644
index 0000000..0d76a89
--- /dev/null
+++ b/rust/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "_pendulum"
+version = "3.0.0"
+edition = "2021"
+
+[lib]
+name = "_pendulum"
+crate-type = ["cdylib", "rlib"]
+
+[profile.release]
+lto = "fat"
+codegen-units = 1
+strip = true
+overflow-checks = false
+
+[dependencies]
+pyo3 = { version = "0.19.0", features = ["extension-module", "generate-import-lib"] }
+mimalloc = { version = "0.1.39", optional = true, default-features = false }
+
+[features]
+extension-module = ["pyo3/extension-module"]
+default = ["mimalloc"]
diff --git a/rust/src/constants.rs b/rust/src/constants.rs
new file mode 100644
index 0000000..3fea9c0
--- /dev/null
+++ b/rust/src/constants.rs
@@ -0,0 +1,56 @@
+pub const EPOCH_YEAR: u32 = 1970;
+
+pub const DAYS_PER_N_YEAR: u32 = 365;
+pub const DAYS_PER_L_YEAR: u32 = 366;
+
+pub const SECS_PER_MIN: u32 = 60;
+pub const SECS_PER_HOUR: u32 = SECS_PER_MIN * 60;
+pub const SECS_PER_DAY: u32 = SECS_PER_HOUR * 24;
+
+// 400-year chunks always have 146097 days (20871 weeks).
+pub const DAYS_PER_400_YEARS: u32 = 146_097;
+pub const SECS_PER_400_YEARS: u64 = DAYS_PER_400_YEARS as u64 * SECS_PER_DAY as u64;
+
+// The number of seconds in an aligned 100-year chunk, for those that
+// do not begin with a leap year and those that do respectively.
+pub const SECS_PER_100_YEARS: [u64; 2] = [
+    (76 * DAYS_PER_N_YEAR as u64 + 24 * DAYS_PER_L_YEAR as u64) * SECS_PER_DAY as u64,
+    (75 * DAYS_PER_N_YEAR as u64 + 25 * DAYS_PER_L_YEAR as u64) * SECS_PER_DAY as u64,
+];
+
+// The number of seconds in an aligned 4-year chunk, for those that
+// do not begin with a leap year and those that do respectively.
+#[allow(clippy::erasing_op)]
+pub const SECS_PER_4_YEARS: [u32; 2] = [
+    (4 * DAYS_PER_N_YEAR + 0 * DAYS_PER_L_YEAR) * SECS_PER_DAY,
+    (3 * DAYS_PER_N_YEAR + DAYS_PER_L_YEAR) * SECS_PER_DAY,
+];
+
+// The number of seconds in non-leap and leap years respectively.
+pub const SECS_PER_YEAR: [u32; 2] = [
+    DAYS_PER_N_YEAR * SECS_PER_DAY,
+    DAYS_PER_L_YEAR * SECS_PER_DAY,
+];
+
+// The month lengths in non-leap and leap years respectively.
+pub const DAYS_PER_MONTHS: [[i32; 13]; 2] = [
+    [-1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
+    [-1, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
+];
+
+// The day offsets of the beginning of each (1-based) month in non-leap
+// and leap years respectively.
+// For example, in a leap year there are 335 days before December.
+pub const MONTHS_OFFSETS: [[i32; 14]; 2] = [
+    [
+        -1, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365,
+    ],
+    [
+        -1, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366,
+    ],
+];
+
+pub const DAY_OF_WEEK_TABLE: [u32; 12] = [0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4];
+
+pub const TM_JANUARY: usize = 0;
+pub const TM_DECEMBER: usize = 11;
diff --git a/rust/src/helpers.rs b/rust/src/helpers.rs
new file mode 100644
index 0000000..364075a
--- /dev/null
+++ b/rust/src/helpers.rs
@@ -0,0 +1,122 @@
+use crate::constants::{
+    DAYS_PER_L_YEAR, DAYS_PER_N_YEAR, DAY_OF_WEEK_TABLE, EPOCH_YEAR, MONTHS_OFFSETS,
+    SECS_PER_100_YEARS, SECS_PER_400_YEARS, SECS_PER_4_YEARS, SECS_PER_DAY, SECS_PER_HOUR,
+    SECS_PER_MIN, SECS_PER_YEAR, TM_DECEMBER, TM_JANUARY,
+};
+
+fn p(year: i32) -> i32 {
+    year + year / 4 - year / 100 + year / 400
+}
+
+pub fn is_leap(year: i32) -> bool {
+    year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)
+}
+
+pub fn is_long_year(year: i32) -> bool {
+    (p(year) % 7 == 4) || (p(year - 1) % 7 == 3)
+}
+
+pub fn days_in_year(year: i32) -> u32 {
+    if is_leap(year) {
+        return DAYS_PER_L_YEAR;
+    }
+
+    DAYS_PER_N_YEAR
+}
+
+pub fn week_day(year: i32, month: u32, day: u32) -> u32 {
+    let y: i32 = year - i32::from(month < 3);
+
+    let w: i32 = (p(y) + DAY_OF_WEEK_TABLE[(month - 1) as usize] as i32 + day as i32) % 7;
+
+    if w == 0 {
+        return 7;
+    }
+
+    w.unsigned_abs()
+}
+
+pub fn day_number(year: i32, month: u8, day: u8) -> i32 {
+    let m = i32::from((month + 9) % 12);
+    let y = year - m / 10;
+
+    365 * y + y / 4 - y / 100 + y / 400 + (m * 306 + 5) / 10 + (i32::from(day) - 1)
+}
+
+pub fn local_time(
+    unix_time: f64,
+    utc_offset: isize,
+    microsecond: usize,
+) -> (usize, usize, usize, usize, usize, usize, usize) {
+    let mut year: usize = EPOCH_YEAR as usize;
+    let mut seconds: isize = unix_time.floor() as isize;
+
+    // Shift to a base year that is 400-year aligned.
+    if seconds >= 0 {
+        seconds -= (10957 * SECS_PER_DAY as usize) as isize;
+        year += 30; // == 2000
+    } else {
+        seconds += ((146_097 - 10957) * SECS_PER_DAY as usize) as isize;
+        year -= 370; // == 1600
+    }
+
+    seconds += utc_offset;
+
+    // Handle years in chunks of 400/100/4/1
+    year += 400 * (seconds / SECS_PER_400_YEARS as isize) as usize;
+    seconds %= SECS_PER_400_YEARS as isize;
+    if seconds < 0 {
+        seconds += SECS_PER_400_YEARS as isize;
+        year -= 400;
+    }
+
+    let mut leap_year = 1; // 4-century aligned
+    let mut sec_per_100years = SECS_PER_100_YEARS[leap_year] as isize;
+
+    while seconds >= sec_per_100years {
+        seconds -= sec_per_100years;
+        year += 100;
+        leap_year = 0; // 1-century, non 4-century aligned
+        sec_per_100years = SECS_PER_100_YEARS[leap_year] as isize;
+    }
+
+    let mut sec_per_4years = SECS_PER_4_YEARS[leap_year] as isize;
+    while seconds >= sec_per_4years {
+        seconds -= sec_per_4years;
+        year += 4;
+        leap_year = 1; // 4-year, non century aligned
+        sec_per_4years = SECS_PER_4_YEARS[leap_year] as isize;
+    }
+
+    let mut sec_per_year = SECS_PER_YEAR[leap_year] as isize;
+    while seconds >= sec_per_year {
+        seconds -= sec_per_year;
+        year += 1;
+        leap_year = 0; // non 4-year aligned
+        sec_per_year = SECS_PER_YEAR[leap_year] as isize;
+    }
+
+    // Handle months and days
+    let mut month = TM_DECEMBER + 1;
+    let mut day: usize = (seconds / (SECS_PER_DAY as isize) + 1) as usize;
+    seconds %= SECS_PER_DAY as isize;
+
+    let mut month_offset: usize;
+    while month != (TM_JANUARY + 1) {
+        month_offset = MONTHS_OFFSETS[leap_year][month] as usize;
+        if day > month_offset {
+            day -= month_offset;
+            break;
+        }
+
+        month -= 1;
+    }
+
+    // Handle hours, minutes and seconds
+    let hour: usize = (seconds / SECS_PER_HOUR as isize) as usize;
+    seconds %= SECS_PER_HOUR as isize;
+    let minute: usize = (seconds / SECS_PER_MIN as isize) as usize;
+    let second: usize = (seconds % SECS_PER_MIN as isize) as usize;
+
+    (year, month, day, hour, minute, second, microsecond)
+}
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
new file mode 100644
index 0000000..bd0f1f6
--- /dev/null
+++ b/rust/src/lib.rs
@@ -0,0 +1,12 @@
+extern crate core;
+
+#[cfg(feature = "mimalloc")]
+#[global_allocator]
+static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
+
+mod constants;
+mod helpers;
+mod parsing;
+mod python;
+
+pub use python::_pendulum;
diff --git a/rust/src/parsing.rs b/rust/src/parsing.rs
new file mode 100644
index 0000000..757a3e3
--- /dev/null
+++ b/rust/src/parsing.rs
@@ -0,0 +1,905 @@
+use core::str;
+use std::{fmt, str::CharIndices};
+
+use crate::{
+    constants::MONTHS_OFFSETS,
+    helpers::{days_in_year, is_leap, is_long_year, week_day},
+};
+
+#[derive(Debug, Clone)]
+pub struct ParseError {
+    index: usize,
+    message: String,
+}
+
+impl fmt::Display for ParseError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{} (Position: {})", self.message, self.index)
+    }
+}
+
+pub struct ParsedDateTime {
+    pub year: u32,
+    pub month: u32,
+    pub day: u32,
+    pub hour: u32,
+    pub minute: u32,
+    pub second: u32,
+    pub microsecond: u32,
+    pub offset: Option<i32>,
+    pub has_offset: bool,
+    pub tzname: Option<String>,
+    pub has_date: bool,
+    pub has_time: bool,
+    pub extended_date_format: bool,
+    pub time_is_midnight: bool,
+}
+
+impl ParsedDateTime {
+    pub fn new() -> ParsedDateTime {
+        ParsedDateTime {
+            year: 0,
+            month: 1,
+            day: 1,
+            hour: 0,
+            minute: 0,
+            second: 0,
+            microsecond: 0,
+            offset: None,
+            has_offset: false,
+            tzname: None,
+            has_date: false,
+            has_time: false,
+            extended_date_format: false,
+            time_is_midnight: false,
+        }
+    }
+}
+
+pub struct ParsedDuration {
+    pub years: u32,
+    pub months: u32,
+    pub weeks: u32,
+    pub days: u32,
+    pub hours: u32,
+    pub minutes: u32,
+    pub seconds: u32,
+    pub microseconds: u32,
+}
+
+impl ParsedDuration {
+    pub fn new() -> ParsedDuration {
+        ParsedDuration {
+            years: 0,
+            months: 0,
+            weeks: 0,
+            days: 0,
+            hours: 0,
+            minutes: 0,
+            seconds: 0,
+            microseconds: 0,
+        }
+    }
+}
+
+pub struct Parsed {
+    pub datetime: Option<ParsedDateTime>,
+    pub duration: Option<ParsedDuration>,
+    pub second_datetime: Option<ParsedDateTime>,
+}
+
+impl Parsed {
+    pub fn new() -> Parsed {
+        Parsed {
+            datetime: None,
+            duration: None,
+            second_datetime: None,
+        }
+    }
+}
+
+pub struct Parser<'a> {
+    /// Input to parse.
+    src: &'a str,
+    /// Iterator used for getting characters from `src`.
+    chars: CharIndices<'a>,
+    /// Current byte offset into `src`.
+    idx: usize,
+    /// Current character
+    current: char,
+}
+
+impl<'a> Parser<'a> {
+    /// Creates a new parser from a &str.
+    pub fn new(input: &'a str) -> Parser<'a> {
+        let mut p = Parser {
+            src: input,
+            chars: input.char_indices(),
+            idx: 0,
+            current: '\0',
+        };
+        p.inc();
+        p
+    }
+
+    /// Increments the parser if the end of the input has not been reached.
+    /// Returns whether or not it was able to advance.
+    fn inc(&mut self) -> Option<char> {
+        if let Some((i, ch)) = self.chars.next() {
+            self.idx = i;
+            self.current = ch;
+            Some(ch)
+        } else {
+            self.idx = self.src.len();
+            self.current = '\0';
+            None
+        }
+    }
+
+    fn parse_error(&mut self, message: String) -> ParseError {
+        ParseError {
+            index: self.idx,
+            message,
+        }
+    }
+
+    fn unexpected_character_error(
+        &mut self,
+        field_name: &str,
+        expected_character_count: usize,
+    ) -> ParseError {
+        if self.end() {
+            return self.parse_error(format!(
+                "Unexpected end of string while parsing {}. Expected {} more character{}.",
+                field_name,
+                expected_character_count,
+                if expected_character_count == 1 {
+                    ""
+                } else {
+                    "s"
+                }
+            ));
+        }
+
+        self.parse_error(format!(
+            "Invalid character while parsing {}: {}.",
+            field_name, self.current,
+        ))
+    }
+
+    /// Returns true if the parser has reached the end of the input.
+    fn end(&self) -> bool {
+        self.idx >= self.src.len()
+    }
+
+    fn parse_integer(&mut self, length: usize, field_name: &str) -> Result<u32, ParseError> {
+        let mut value: u32 = 0;
+
+        for i in 0..length {
+            if self.end() {
+                return Err(self.parse_error(format!(
+                    "Unexpected end of string while parsing \"{}\". Expected {} more character{}",
+                    field_name,
+                    length - i,
+                    if (length - i) != 1 { "s" } else { "" }
+                )));
+            }
+
+            if let Some(digit) = self.current.to_digit(10) {
+                value = 10 * value + digit;
+                self.inc();
+            } else {
+                return Err(self.unexpected_character_error(field_name, length - i));
+            }
+        }
+
+        Ok(value)
+    }
+
+    pub fn parse(&mut self) -> Result<Parsed, ParseError> {
+        let mut parsed = Parsed::new();
+
+        if self.current == 'P' {
+            // Duration (and possibly time interval)
+            self.parse_duration(&mut parsed)?;
+        } else {
+            self.parse_datetime(&mut parsed)?;
+        }
+
+        Ok(parsed)
+    }
+
+    fn parse_datetime(&mut self, parsed: &mut Parsed) -> Result<(), ParseError> {
+        let mut datetime = ParsedDateTime::new();
+
+        if self.current == 'T' {
+            self.parse_time(&mut datetime, false)?;
+
+            if !self.end() {
+                return Err(self.parse_error("Unconverted data remains".to_string()));
+            }
+
+            match &parsed.datetime {
+                Some(_) => {
+                    parsed.second_datetime = Some(datetime);
+                }
+                None => match &parsed.duration {
+                    Some(_) => {
+                        parsed.second_datetime = Some(datetime);
+                    }
+                    None => {
+                        parsed.datetime = Some(datetime);
+                    }
+                },
+            }
+
+            return Ok(());
+        }
+
+        datetime.year = self.parse_integer(2, "year")?;
+
+        if self.current == ':' {
+            // Time in extended format
+            datetime.hour = datetime.year;
+            datetime.year = 0;
+            datetime.extended_date_format = true;
+            self.parse_time(&mut datetime, true)?;
+
+            if !self.end() {
+                return Err(self.parse_error("Unconverted data remains".to_string()));
+            }
+
+            match &parsed.datetime {
+                Some(_) => {
+                    parsed.second_datetime = Some(datetime);
+                }
+                None => match &parsed.duration {
+                    Some(_) => {
+                        parsed.second_datetime = Some(datetime);
+                    }
+                    None => {
+                        parsed.datetime = Some(datetime);
+                    }
+                },
+            }
+
+            return Ok(());
+        }
+
+        datetime.has_date = true;
+        datetime.year = datetime.year * 100 + self.parse_integer(2, "year")?;
+
+        if self.current == '-' {
+            self.inc();
+            datetime.extended_date_format = true;
+
+            if self.current == 'W' {
+                // ISO week and day in extended format (i.e. Www-D)
+                self.inc();
+
+                let iso_week = self.parse_integer(2, "iso week")?;
+                let mut iso_day: u32 = 1;
+
+                if !self.end() && self.current != ' ' && self.current != 'T' {
+                    // Optional day
+                    if self.current != '-' {
+                        return Err(self.parse_error(format!(
+                            "Invalid character \"{}\" while parsing {}",
+                            self.current, "date separator"
+                        )));
+                    }
+
+                    self.inc();
+
+                    iso_day = self.parse_integer(1, "iso day")?;
+                }
+
+                let (year, month, day) = self.iso_to_ymd(datetime.year, iso_week, iso_day)?;
+
+                datetime.year = year;
+                datetime.month = month;
+                datetime.day = day;
+            } else {
+                /*
+                Month and day in extended format (MM-DD) or ordinal date (DDD)
+                We'll assume first that the next part is a month and adjust if not.
+                */
+                datetime.month = self.parse_integer(2, "month")?;
+
+                if !self.end() && self.current != ' ' && self.current != 'T' {
+                    if self.current == '-' {
+                        // Optional day
+                        self.inc();
+                        datetime.day = self.parse_integer(2, "day")?;
+                    } else {
+                        // Ordinal day
+                        let ordinal_day =
+                            (datetime.month * 10 + self.parse_integer(1, "ordinal day")?) as i32;
+
+                        let (year, month, day) =
+                            self.ordinal_to_ymd(datetime.year, ordinal_day, false)?;
+
+                        datetime.year = year;
+                        datetime.month = month;
+                        datetime.day = day;
+                    }
+                } else {
+                    datetime.day = 1;
+                }
+            }
+        } else if self.current == 'W' {
+            // Compact ISO week and day (WwwD)
+            self.inc();
+
+            let iso_week = self.parse_integer(2, "iso week")?;
+            let mut iso_day: u32 = 1;
+
+            if !self.end() && self.current != ' ' && self.current != 'T' {
+                iso_day = self.parse_integer(1, "iso day")?;
+            }
+
+            match self.iso_to_ymd(datetime.year, iso_week, iso_day) {
+                Ok((year, month, day)) => {
+                    datetime.year = year;
+                    datetime.month = month;
+                    datetime.day = day;
+                }
+                Err(error) => return Err(error),
+            }
+        } else {
+            /*
+            Month and day in compact format (MMDD) or ordinal date (DDD)
+            We'll assume first that the next part is a month and adjust if not.
+            */
+            datetime.month = self.parse_integer(2, "month")?;
+            let mut ordinal_day = self.parse_integer(1, "ordinal day")? as i32;
+
+            if self.end() || self.current == ' ' || self.current == 'T' {
+                // Ordinal day
+                ordinal_day += datetime.month as i32 * 10;
+
+                let (year, month, day) = self.ordinal_to_ymd(datetime.year, ordinal_day, false)?;
+
+                datetime.year = year;
+                datetime.month = month;
+                datetime.day = day;
+            } else {
+                // Day
+                datetime.day = ordinal_day as u32 * 10 + self.parse_integer(1, "day")?;
+            }
+        }
+
+        if !self.end() {
+            self.parse_time(&mut datetime, false)?;
+        }
+
+        if !self.end() {
+            if self.current == '/' && parsed.datetime.is_none() && parsed.duration.is_none() {
+                // Interval
+                parsed.datetime = Some(datetime);
+
+                self.inc();
+
+                if self.current == 'P' {
+                    // Duration
+                    self.parse_duration(parsed)?;
+                } else {
+                    self.parse_datetime(parsed)?;
+                }
+
+                return Ok(());
+            }
+
+            return Err(self.parse_error("Unconverted data remains".to_string()));
+        }
+
+        match &parsed.datetime {
+            Some(_) => {
+                parsed.second_datetime = Some(datetime);
+            }
+            None => match &parsed.duration {
+                Some(_) => {
+                    parsed.second_datetime = Some(datetime);
+                }
+                None => {
+                    parsed.datetime = Some(datetime);
+                }
+            },
+        }
+
+        Ok(())
+    }
+
+    fn parse_time(
+        &mut self,
+        datetime: &mut ParsedDateTime,
+        skip_hour: bool,
+    ) -> Result<(), ParseError> {
+        // TODO: Add support for decimal units
+
+        // Date/Time separator
+        if self.current != 'T' && self.current != ' ' && !skip_hour {
+            return Err(self.parse_error(format!(
+                "Invalid character \"{}\" while parsing {}",
+                self.current, "date and time separator (\"T\" or \" \")"
+            )));
+        }
+
+        datetime.has_time = true;
+
+        if !skip_hour {
+            self.inc();
+
+            // Hour
+            datetime.hour = self.parse_integer(2, "hour")?;
+        }
+
+        if !self.end() && self.current != 'Z' && self.current != '+' && self.current != '-' {
+            // Optional minute and second
+            if self.current == ':' {
+                // Minute and second in extended format (mm:ss)
+                self.inc();
+
+                // Minute
+                datetime.minute = self.parse_integer(2, "minute")?;
+
+                if !self.end() && self.current != 'Z' && self.current != '+' && self.current != '-'
+                {
+                    // Optional second
+                    if self.current != ':' {
+                        return Err(self.parse_error(format!(
+                            "Invalid character \"{}\" while parsing {}",
+                            self.current, "time separator (\":\")"
+                        )));
+                    }
+
+                    self.inc();
+
+                    // Second
+                    datetime.second = self.parse_integer(2, "second")?;
+
+                    if self.current == '.' || self.current == ',' {
+                        // Optional fractional second
+                        self.inc();
+
+                        datetime.microsecond = 0;
+                        let mut i: u8 = 0;
+
+                        while i < 6 {
+                            if let Some(digit) = self.current.to_digit(10) {
+                                datetime.microsecond = datetime.microsecond * 10 + digit;
+                            } else if i == 0 {
+                                // One digit minimum is required
+                                return Err(self.unexpected_character_error("subsecond", 1));
+                            } else {
+                                break;
+                            }
+
+                            self.inc();
+                            i += 1;
+                        }
+
+                        // Drop extraneous digits
+                        while self.current.is_ascii_digit() {
+                            self.inc();
+                        }
+
+                        // Expand missing microsecond
+                        while i < 6 {
+                            datetime.microsecond *= 10;
+                            i += 1;
+                        }
+                    }
+
+                    if !datetime.extended_date_format {
+                        return Err(self.parse_error("Cannot combine \"basic\" date format with \"extended\" time format (Should be either `YYYY-MM-DDThh:mm:ss` or `YYYYMMDDThhmmss`).".to_string()));
+                    }
+                }
+            } else {
+                // Minute and second in compact format (mmss)
+
+                // Minute
+                datetime.minute = self.parse_integer(2, "minute")?;
+
+                if !self.end() && self.current != 'Z' && self.current != '+' && self.current != '-'
+                {
+                    // Optional second
+
+                    datetime.second = self.parse_integer(2, "second")?;
+
+                    if self.current == '.' || self.current == ',' {
+                        // Optional fractional second
+                        self.inc();
+
+                        datetime.microsecond = 0;
+                        let mut i: u8 = 0;
+
+                        while i < 6 {
+                            if let Some(digit) = self.current.to_digit(10) {
+                                datetime.microsecond = datetime.microsecond * 10 + digit;
+                            } else if i == 0 {
+                                // One digit minimum is required
+                                return Err(self.unexpected_character_error("subsecond", 1));
+                            } else {
+                                break;
+                            }
+
+                            self.inc();
+                            i += 1;
+                        }
+
+                        // Drop extraneous digits
+                        while self.current.is_ascii_digit() {
+                            self.inc();
+                        }
+
+                        // Expand missing microsecond
+                        while i < 6 {
+                            datetime.microsecond *= 10;
+                            i += 1;
+                        }
+                    }
+                }
+
+                if datetime.extended_date_format {
+                    return Err(self.parse_error("Cannot combine \"extended\" date format with \"basic\" time format (Should be either `YYYY-MM-DDThh:mm:ss` or `YYYYMMDDThhmmss`).".to_string()));
+                }
+            }
+        }
+
+        if datetime.hour == 24
+            && datetime.minute == 0
+            && datetime.second == 0
+            && datetime.microsecond == 0
+        {
+            // Special case for 24:00:00, which is valid for ISO 8601.
+            // This is equivalent to 00:00:00 the next day.
+            // We will store the information for now.
+            datetime.time_is_midnight = true;
+        }
+
+        if self.current == 'Z' {
+            // UTC
+            datetime.offset = Some(0);
+            datetime.tzname = Some("UTC".to_string());
+            self.inc();
+        } else if matches!(self.current, '+' | '-') {
+            // Optional timezone offset
+            let tzsign = if self.current == '+' { 1 } else { -1 };
+            self.inc();
+            // Offset hour
+            let tzhour = self.parse_integer(2, "timezone hour")? as i32;
+            if self.current == ':' {
+                // Optional separator
+                self.inc();
+            }
+            let mut tzminute = if self.end() {
+                0
+            } else {
+                // Optional minute
+                self.parse_integer(2, "timezone minute")? as i32
+            };
+            tzminute += tzhour * 60;
+            tzminute *= tzsign;
+            if tzminute > 24 * 60 {
+                return Err(self.parse_error("Timezone offset is too large".to_string()));
+            }
+            datetime.offset = Some(tzminute * 60);
+        }
+
+        Ok(())
+    }
+
+    fn parse_duration(&mut self, parsed: &mut Parsed) -> Result<(), ParseError> {
+        // Removing P operator
+        self.inc();
+
+        let mut duration: ParsedDuration = ParsedDuration::new();
+        let mut got_t: bool = false;
+        let mut last_had_fraction = false;
+
+        loop {
+            match self.current {
+                'T' => {
+                    if got_t {
+                        return Err(
+                            self.parse_error("Repeated time declaration in duration".to_string())
+                        );
+                    }
+
+                    got_t = true;
+                }
+                _c => {
+                    let (value, op_fraction) = self.parse_duration_number_frac()?;
+                    if last_had_fraction {
+                        return Err(self.parse_error("Invalid duration fraction".to_string()));
+                    }
+
+                    if op_fraction.is_some() {
+                        last_had_fraction = true;
+                    }
+
+                    if got_t {
+                        match self.current {
+                            'H' => {
+                                if duration.minutes != 0
+                                    || duration.seconds != 0
+                                    || duration.microseconds != 0
+                                {
+                                    return Err(
+                                        self.parse_error("Duration units out of order".to_string())
+                                    );
+                                }
+
+                                duration.hours += value;
+
+                                if let Some(fraction) = op_fraction {
+                                    let extra_minutes = fraction * 60_f64;
+                                    let extra_full_minutes: f64 = extra_minutes.trunc();
+                                    duration.minutes += extra_full_minutes as u32;
+                                    let extra_seconds =
+                                        ((extra_minutes - extra_full_minutes) * 60.0).round();
+                                    let extra_full_seconds = extra_seconds.trunc();
+                                    duration.seconds += extra_full_seconds as u32;
+                                    let micro_extra = ((extra_seconds - extra_full_seconds)
+                                        * 1_000_000.0)
+                                        .round()
+                                        as u32;
+                                    duration.microseconds += micro_extra;
+                                }
+                            }
+                            'M' => {
+                                if duration.seconds != 0 || duration.microseconds != 0 {
+                                    return Err(
+                                        self.parse_error("Duration units out of order".to_string())
+                                    );
+                                }
+
+                                duration.minutes += value;
+
+                                if let Some(fraction) = op_fraction {
+                                    let extra_seconds = fraction * 60_f64;
+                                    let extra_full_seconds = extra_seconds.trunc();
+                                    duration.seconds += extra_full_seconds as u32;
+                                    let micro_extra = ((extra_seconds - extra_full_seconds)
+                                        * 1_000_000.0)
+                                        .round()
+                                        as u32;
+                                    duration.microseconds += micro_extra;
+                                }
+                            }
+                            'S' => {
+                                duration.seconds = value;
+
+                                if let Some(fraction) = op_fraction {
+                                    duration.microseconds +=
+                                        (fraction * 1_000_000.0).round() as u32;
+                                }
+                            }
+                            _ => {
+                                return Err(
+                                    self.parse_error("Invalid duration time unit".to_string())
+                                )
+                            }
+                        }
+                    } else {
+                        match self.current {
+                            'Y' => {
+                                if last_had_fraction {
+                                    return Err(self.parse_error(
+                                        "Fractional years in duration are not supported"
+                                            .to_string(),
+                                    ));
+                                }
+
+                                if duration.months != 0 || duration.days != 0 {
+                                    return Err(
+                                        self.parse_error("Duration units out of order".to_string())
+                                    );
+                                }
+
+                                duration.years = value;
+                            }
+                            'M' => {
+                                if last_had_fraction {
+                                    return Err(self.parse_error(
+                                        "Fractional months in duration are not supported"
+                                            .to_string(),
+                                    ));
+                                }
+
+                                if duration.days != 0 {
+                                    return Err(
+                                        self.parse_error("Duration units out of order".to_string())
+                                    );
+                                }
+
+                                duration.months = value;
+                            }
+                            'W' => {
+                                if duration.years != 0 || duration.months != 0 {
+                                    return Err(self.parse_error(
+                                        "Basic format durations cannot have weeks".to_string(),
+                                    ));
+                                }
+
+                                duration.weeks = value;
+
+                                if let Some(fraction) = op_fraction {
+                                    let extra_days = fraction * 7_f64;
+                                    let extra_full_days = extra_days.trunc();
+                                    duration.days += extra_full_days as u32;
+                                    let extra_hours = (extra_days - extra_full_days) * 24.0;
+                                    let extra_full_hours = extra_hours.trunc();
+                                    duration.hours += extra_full_hours as u32;
+                                    let extra_minutes =
+                                        ((extra_hours - extra_full_hours) * 60.0).round();
+                                    let extra_full_minutes: f64 = extra_minutes.trunc();
+                                    duration.minutes += extra_full_minutes as u32;
+                                    let extra_seconds =
+                                        ((extra_minutes - extra_full_minutes) * 60.0).round();
+                                    let extra_full_seconds = extra_seconds.trunc();
+                                    duration.seconds += extra_full_seconds as u32;
+                                    let micro_extra = ((extra_seconds - extra_full_seconds)
+                                        * 1_000_000.0)
+                                        .round()
+                                        as u32;
+                                    duration.microseconds += micro_extra;
+                                }
+                            }
+                            'D' => {
+                                if duration.weeks != 0 {
+                                    return Err(self.parse_error(
+                                        "Week format durations cannot have days".to_string(),
+                                    ));
+                                }
+
+                                duration.days += value;
+                                if let Some(fraction) = op_fraction {
+                                    let extra_hours = fraction * 24.0;
+                                    let extra_full_hours = extra_hours.trunc();
+                                    duration.hours += extra_full_hours as u32;
+                                    let extra_minutes =
+                                        ((extra_hours - extra_full_hours) * 60.0).round();
+                                    let extra_full_minutes: f64 = extra_minutes.trunc();
+                                    duration.minutes += extra_full_minutes as u32;
+                                    let extra_seconds =
+                                        ((extra_minutes - extra_full_minutes) * 60.0).round();
+                                    let extra_full_seconds = extra_seconds.trunc();
+                                    duration.seconds += extra_full_seconds as u32;
+                                    let micro_extra = ((extra_seconds - extra_full_seconds)
+                                        * 1_000_000.0)
+                                        .round()
+                                        as u32;
+                                    duration.microseconds += micro_extra;
+                                }
+                            }
+                            _ => {
+                                return Err(
+                                    self.parse_error("Invalid duration time unit".to_string())
+                                )
+                            }
+                        }
+                    }
+                }
+            }
+            self.inc();
+
+            if self.end() {
+                break;
+            }
+        }
+
+        parsed.duration = Some(duration);
+
+        Ok(())
+    }
+
+    fn parse_duration_number_frac(&mut self) -> Result<(u32, Option<f64>), ParseError> {
+        let value = self.parse_duration_number()?;
+        let fraction = matches!(self.current, '.' | ',').then(|| {
+            let mut decimal = 0_f64;
+            let mut denominator = 1_f64;
+
+            while let Some(digit) = self.inc().and_then(|ch| ch.to_digit(10)) {
+                decimal *= 10.0;
+                decimal += f64::from(digit);
+                denominator *= 10.0;
+            }
+
+            decimal / denominator
+        });
+
+        Ok((value, fraction))
+    }
+
+    fn parse_duration_number(&mut self) -> Result<u32, ParseError> {
+        let Some(mut value) = self.current.to_digit(10) else {
+            return Err(self.parse_error("Invalid number in duration".to_string()));
+        };
+
+        while let Some(digit) = self.inc().and_then(|ch| ch.to_digit(10)) {
+            value *= 10;
+            value += digit;
+        }
+
+        Ok(value)
+    }
+
+    fn iso_to_ymd(
+        &mut self,
+        iso_year: u32,
+        iso_week: u32,
+        iso_day: u32,
+    ) -> Result<(u32, u32, u32), ParseError> {
+        if iso_week > 53 || iso_week > 52 && !is_long_year(iso_year as i32) {
+            return Err(ParseError {
+                index: self.idx,
+                message: format!(
+                    "Invalid ISO date: week {iso_week} out of range for year {iso_year}"
+                ),
+            });
+        }
+
+        if iso_day > 7 {
+            return Err(ParseError {
+                index: self.idx,
+                message: "Invalid ISO date: week day is invalid".to_string(),
+            });
+        }
+
+        let ordinal: i32 =
+            iso_week as i32 * 7 + iso_day as i32 - (week_day(iso_year as i32, 1, 4) as i32 + 3);
+
+        self.ordinal_to_ymd(iso_year, ordinal, true)
+    }
+
+    fn ordinal_to_ymd(
+        &mut self,
+        year: u32,
+        ordinal: i32,
+        allow_out_of_bounds: bool,
+    ) -> Result<(u32, u32, u32), ParseError> {
+        let mut ord: i32 = ordinal;
+        let mut y: u32 = year;
+        let mut leap: usize = usize::from(is_leap(y as i32));
+
+        if ord < 1 {
+            if !allow_out_of_bounds {
+                return Err(self.parse_error(format!(
+                    "Invalid ordinal day: {ordinal} is too small for year {year}"
+                )));
+            }
+            // Previous year
+            ord += days_in_year((year - 1) as i32) as i32;
+            y -= 1;
+            leap = usize::from(is_leap(y as i32));
+        }
+
+        if ord > days_in_year(y as i32) as i32 {
+            if !allow_out_of_bounds {
+                return Err(self.parse_error(format!(
+                    "Invalid ordinal day: {ordinal} is too large for year {year}"
+                )));
+            }
+
+            // Next year
+            ord -= days_in_year(y as i32) as i32;
+            y += 1;
+            leap = usize::from(is_leap(y as i32));
+        }
+
+        for i in 1..14 {
+            if ord < MONTHS_OFFSETS[leap][i] {
+                let day = ord as u32 - MONTHS_OFFSETS[leap][i - 1] as u32;
+                let month = (i - 1) as u32;
+
+                return Ok((y, month, day));
+            }
+        }
+
+        Err(self.parse_error(format!(
+            "Invalid ordinal day: {ordinal} is too large for year {year}"
+        )))
+    }
+}
diff --git a/rust/src/python/helpers.rs b/rust/src/python/helpers.rs
new file mode 100644
index 0000000..4a53e59
--- /dev/null
+++ b/rust/src/python/helpers.rs
@@ -0,0 +1,388 @@
+use std::cmp::Ordering;
+
+use pyo3::{
+    intern,
+    prelude::*,
+    types::{PyDate, PyDateAccess, PyDateTime, PyDelta, PyDeltaAccess, PyString, PyTimeAccess},
+    PyTypeInfo,
+};
+
+use crate::{
+    constants::{DAYS_PER_MONTHS, SECS_PER_DAY, SECS_PER_HOUR, SECS_PER_MIN},
+    helpers,
+};
+
+use crate::python::types::PreciseDiff;
+
+struct DateTimeInfo<'py> {
+    pub year: i32,
+    pub month: i32,
+    pub day: i32,
+    pub hour: i32,
+    pub minute: i32,
+    pub second: i32,
+    pub microsecond: i32,
+    pub total_seconds: i32,
+    pub offset: i32,
+    pub tz: &'py str,
+    pub is_datetime: bool,
+}
+
+impl PartialEq for DateTimeInfo<'_> {
+    fn eq(&self, other: &Self) -> bool {
+        (
+            self.year,
+            self.month,
+            self.day,
+            self.hour,
+            self.minute,
+            self.second,
+            self.microsecond,
+        )
+            .eq(&(
+                other.year,
+                other.month,
+                other.day,
+                other.hour,
+                other.minute,
+                other.second,
+                other.microsecond,
+            ))
+    }
+}
+
+impl PartialOrd for DateTimeInfo<'_> {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        (
+            self.year,
+            self.month,
+            self.day,
+            self.hour,
+            self.minute,
+            self.second,
+            self.microsecond,
+        )
+            .partial_cmp(&(
+                other.year,
+                other.month,
+                other.day,
+                other.hour,
+                other.minute,
+                other.second,
+                other.microsecond,
+            ))
+    }
+}
+
+pub fn get_tz_name<'py>(py: Python, dt: &'py PyAny) -> PyResult<&'py str> {
+    let tz: &str = "";
+
+    if !PyDateTime::is_type_of(dt) {
+        return Ok(tz);
+    }
+
+    let tzinfo = dt.getattr("tzinfo");
+
+    match tzinfo {
+        Err(_) => Ok(tz),
+        Ok(tzinfo) => {
+            if tzinfo.is_none() {
+                return Ok(tz);
+            }
+            if tzinfo.hasattr(intern!(py, "key")).unwrap_or(false) {
+                // zoneinfo timezone
+                let tzname: &PyString = tzinfo
+                    .getattr(intern!(py, "key"))
+                    .unwrap()
+                    .downcast()
+                    .unwrap();
+
+                return tzname.to_str();
+            } else if tzinfo.hasattr(intern!(py, "name")).unwrap_or(false) {
+                // Pendulum timezone
+                let tzname: &PyString = tzinfo
+                    .getattr(intern!(py, "name"))
+                    .unwrap()
+                    .downcast()
+                    .unwrap();
+
+                return tzname.to_str();
+            } else if tzinfo.hasattr(intern!(py, "zone")).unwrap_or(false) {
+                // pytz timezone
+                let tzname: &PyString = tzinfo
+                    .getattr(intern!(py, "zone"))
+                    .unwrap()
+                    .downcast()
+                    .unwrap();
+
+                return tzname.to_str();
+            }
+
+            Ok(tz)
+        }
+    }
+}
+
+pub fn get_offset(dt: &PyAny) -> PyResult<i32> {
+    if !PyDateTime::is_type_of(dt) {
+        return Ok(0);
+    }
+
+    let tzinfo = dt.getattr("tzinfo")?;
+
+    if tzinfo.is_none() {
+        return Ok(0);
+    }
+
+    let offset: &PyDelta = tzinfo.call_method1("utcoffset", (dt,))?.downcast()?;
+
+    Ok(offset.get_days() * SECS_PER_DAY as i32 + offset.get_seconds())
+}
+
+#[pyfunction]
+pub fn is_leap(year: i32) -> PyResult<bool> {
+    Ok(helpers::is_leap(year))
+}
+
+#[pyfunction]
+pub fn is_long_year(year: i32) -> PyResult<bool> {
+    Ok(helpers::is_long_year(year))
+}
+
+#[pyfunction]
+pub fn week_day(year: i32, month: u32, day: u32) -> PyResult<u32> {
+    Ok(helpers::week_day(year, month, day))
+}
+
+#[pyfunction]
+pub fn days_in_year(year: i32) -> PyResult<u32> {
+    Ok(helpers::days_in_year(year))
+}
+
+#[pyfunction]
+pub fn local_time(
+    unix_time: f64,
+    utc_offset: isize,
+    microsecond: usize,
+) -> PyResult<(usize, usize, usize, usize, usize, usize, usize)> {
+    Ok(helpers::local_time(unix_time, utc_offset, microsecond))
+}
+
+#[pyfunction]
+pub fn precise_diff<'py>(py: Python, dt1: &'py PyAny, dt2: &'py PyAny) -> PyResult<PreciseDiff> {
+    let mut sign = 1;
+    let mut dtinfo1 = DateTimeInfo {
+        year: dt1.downcast::<PyDate>()?.get_year(),
+        month: i32::from(dt1.downcast::<PyDate>()?.get_month()),
+        day: i32::from(dt1.downcast::<PyDate>()?.get_day()),
+        hour: 0,
+        minute: 0,
+        second: 0,
+        microsecond: 0,
+        total_seconds: 0,
+        tz: get_tz_name(py, dt1)?,
+        offset: get_offset(dt1)?,
+        is_datetime: PyDateTime::is_type_of(dt1),
+    };
+    let mut dtinfo2 = DateTimeInfo {
+        year: dt2.downcast::<PyDate>()?.get_year(),
+        month: i32::from(dt2.downcast::<PyDate>()?.get_month()),
+        day: i32::from(dt2.downcast::<PyDate>()?.get_day()),
+        hour: 0,
+        minute: 0,
+        second: 0,
+        microsecond: 0,
+        total_seconds: 0,
+        tz: get_tz_name(py, dt2)?,
+        offset: get_offset(dt2)?,
+        is_datetime: PyDateTime::is_type_of(dt2),
+    };
+    let in_same_tz: bool = dtinfo1.tz == dtinfo2.tz && !dtinfo1.tz.is_empty();
+    let mut total_days = helpers::day_number(dtinfo2.year, dtinfo2.month as u8, dtinfo2.day as u8)
+        - helpers::day_number(dtinfo1.year, dtinfo1.month as u8, dtinfo1.day as u8);
+
+    if dtinfo1.is_datetime {
+        let dt1dt: &PyDateTime = dt1.downcast()?;
+
+        dtinfo1.hour = i32::from(dt1dt.get_hour());
+        dtinfo1.minute = i32::from(dt1dt.get_minute());
+        dtinfo1.second = i32::from(dt1dt.get_second());
+        dtinfo1.microsecond = dt1dt.get_microsecond() as i32;
+
+        if !in_same_tz && dtinfo1.offset != 0 || total_days == 0 {
+            dtinfo1.hour -= dtinfo1.offset / SECS_PER_HOUR as i32;
+            dtinfo1.offset %= SECS_PER_HOUR as i32;
+            dtinfo1.minute -= dtinfo1.offset / SECS_PER_MIN as i32;
+            dtinfo1.offset %= SECS_PER_MIN as i32;
+            dtinfo1.second -= dtinfo1.offset;
+
+            if dtinfo1.second < 0 {
+                dtinfo1.second += 60;
+                dtinfo1.minute -= 1;
+            } else if dtinfo1.second > 60 {
+                dtinfo1.second -= 60;
+                dtinfo1.minute += 1;
+            }
+
+            if dtinfo1.minute < 0 {
+                dtinfo1.minute += 60;
+                dtinfo1.hour -= 1;
+            } else if dtinfo1.minute > 60 {
+                dtinfo1.minute -= 60;
+                dtinfo1.hour += 1;
+            }
+
+            if dtinfo1.hour < 0 {
+                dtinfo1.hour += 24;
+                dtinfo1.day -= 1;
+            } else if dtinfo1.hour > 24 {
+                dtinfo1.hour -= 24;
+                dtinfo1.day += 1;
+            }
+        }
+
+        dtinfo1.total_seconds = dtinfo1.hour * SECS_PER_HOUR as i32
+            + dtinfo1.minute * SECS_PER_MIN as i32
+            + dtinfo1.second;
+    }
+
+    if dtinfo2.is_datetime {
+        let dt2dt: &PyDateTime = dt2.downcast()?;
+
+        dtinfo2.hour = i32::from(dt2dt.get_hour());
+        dtinfo2.minute = i32::from(dt2dt.get_minute());
+        dtinfo2.second = i32::from(dt2dt.get_second());
+        dtinfo2.microsecond = dt2dt.get_microsecond() as i32;
+
+        if !in_same_tz && dtinfo2.offset != 0 || total_days == 0 {
+            dtinfo2.hour -= dtinfo2.offset / SECS_PER_HOUR as i32;
+            dtinfo2.offset %= SECS_PER_HOUR as i32;
+            dtinfo2.minute -= dtinfo2.offset / SECS_PER_MIN as i32;
+            dtinfo2.offset %= SECS_PER_MIN as i32;
+            dtinfo2.second -= dtinfo2.offset;
+
+            if dtinfo2.second < 0 {
+                dtinfo2.second += 60;
+                dtinfo2.minute -= 1;
+            } else if dtinfo2.second > 60 {
+                dtinfo2.second -= 60;
+                dtinfo2.minute += 1;
+            }
+
+            if dtinfo2.minute < 0 {
+                dtinfo2.minute += 60;
+                dtinfo2.hour -= 1;
+            } else if dtinfo2.minute > 60 {
+                dtinfo2.minute -= 60;
+                dtinfo2.hour += 1;
+            }
+
+            if dtinfo2.hour < 0 {
+                dtinfo2.hour += 24;
+                dtinfo2.day -= 1;
+            } else if dtinfo2.hour > 24 {
+                dtinfo2.hour -= 24;
+                dtinfo2.day += 1;
+            }
+        }
+
+        dtinfo2.total_seconds = dtinfo2.hour * SECS_PER_HOUR as i32
+            + dtinfo2.minute * SECS_PER_MIN as i32
+            + dtinfo2.second;
+    }
+
+    if dtinfo1 > dtinfo2 {
+        sign = -1;
+        (dtinfo1, dtinfo2) = (dtinfo2, dtinfo1);
+
+        total_days = -total_days;
+    }
+
+    let mut year_diff = dtinfo2.year - dtinfo1.year;
+    let mut month_diff = dtinfo2.month - dtinfo1.month;
+    let mut day_diff = dtinfo2.day - dtinfo1.day;
+    let mut hour_diff = dtinfo2.hour - dtinfo1.hour;
+    let mut minute_diff = dtinfo2.minute - dtinfo1.minute;
+    let mut second_diff = dtinfo2.second - dtinfo1.second;
+    let mut microsecond_diff = dtinfo2.microsecond - dtinfo1.microsecond;
+
+    if microsecond_diff < 0 {
+        microsecond_diff += 1_000_000;
+        second_diff -= 1;
+    }
+
+    if second_diff < 0 {
+        second_diff += 60;
+        minute_diff -= 1;
+    }
+
+    if minute_diff < 0 {
+        minute_diff += 60;
+        hour_diff -= 1;
+    }
+
+    if hour_diff < 0 {
+        hour_diff += 24;
+        day_diff -= 1;
+    }
+
+    if day_diff < 0 {
+        // If we have a difference in days,
+        // we have to check if they represent months
+        let mut year = dtinfo2.year;
+        let mut month = dtinfo2.month;
+
+        if month == 1 {
+            month = 12;
+            year -= 1;
+        } else {
+            month -= 1;
+        }
+
+        let leap = helpers::is_leap(year);
+
+        let days_in_last_month = DAYS_PER_MONTHS[usize::from(leap)][month as usize];
+        let days_in_month =
+            DAYS_PER_MONTHS[usize::from(helpers::is_leap(dtinfo2.year))][dtinfo2.month as usize];
+
+        match day_diff.cmp(&(days_in_month - days_in_last_month)) {
+            Ordering::Less => {
+                // We don't have a full month, we calculate days
+                if days_in_last_month < dtinfo1.day {
+                    day_diff += dtinfo1.day;
+                } else {
+                    day_diff += days_in_last_month;
+                }
+            }
+            Ordering::Equal => {
+                // We have exactly a full month
+                // We remove the days difference
+                // and add one to the months difference
+                day_diff = 0;
+                month_diff += 1;
+            }
+            Ordering::Greater => {
+                // We have a full month
+                day_diff += days_in_last_month;
+            }
+        }
+
+        month_diff -= 1;
+    }
+
+    if month_diff < 0 {
+        month_diff += 12;
+        year_diff -= 1;
+    }
+
+    Ok(PreciseDiff {
+        years: year_diff * sign,
+        months: month_diff * sign,
+        days: day_diff * sign,
+        hours: hour_diff * sign,
+        minutes: minute_diff * sign,
+        seconds: second_diff * sign,
+        microseconds: microsecond_diff * sign,
+        total_days: total_days * sign,
+    })
+}
diff --git a/rust/src/python/mod.rs b/rust/src/python/mod.rs
new file mode 100644
index 0000000..8d3cd41
--- /dev/null
+++ b/rust/src/python/mod.rs
@@ -0,0 +1,27 @@
+use pyo3::prelude::*;
+
+mod helpers;
+mod parsing;
+mod types;
+
+use helpers::{days_in_year, is_leap, is_long_year, local_time, precise_diff, week_day};
+use parsing::parse_iso8601;
+use types::{Duration, PreciseDiff};
+
+#[pymodule]
+pub fn _pendulum(_py: Python<'_>, m: &PyModule) -> PyResult<()> {
+    m.add_function(wrap_pyfunction!(days_in_year, m)?)?;
+    m.add_function(wrap_pyfunction!(is_leap, m)?)?;
+    m.add_function(wrap_pyfunction!(is_long_year, m)?)?;
+    m.add_function(wrap_pyfunction!(local_time, m)?)?;
+    m.add_function(wrap_pyfunction!(week_day, m)?)?;
+    m.add_function(wrap_pyfunction!(parse_iso8601, m)?)?;
+    m.add_function(wrap_pyfunction!(precise_diff, m)?)?;
+    m.add_class::<Duration>()?;
+    m.add_class::<PreciseDiff>()?;
+
+    #[cfg(not(feature = "mimalloc"))]
+    m.setattr("__pendulum_default_allocator__", true)?; // uses setattr so this is not in __all__
+
+    Ok(())
+}
diff --git a/rust/src/python/parsing.rs b/rust/src/python/parsing.rs
new file mode 100644
index 0000000..48fa64c
--- /dev/null
+++ b/rust/src/python/parsing.rs
@@ -0,0 +1,117 @@
+use pyo3::exceptions;
+use pyo3::prelude::*;
+use pyo3::types::PyDate;
+use pyo3::types::PyDateTime;
+use pyo3::types::PyTime;
+
+use crate::parsing::Parser;
+use crate::python::types::{Duration, FixedTimezone};
+
+#[pyfunction]
+pub fn parse_iso8601(py: Python, input: &str) -> PyResult<PyObject> {
+    let parsed = Parser::new(input).parse();
+
+    match parsed {
+        Ok(parsed) => match (parsed.datetime, parsed.duration, parsed.second_datetime) {
+            (Some(datetime), None, None) => match (datetime.has_date, datetime.has_time) {
+                (true, true) => match datetime.offset {
+                    Some(offset) => {
+                        let dt = PyDateTime::new(
+                            py,
+                            datetime.year as i32,
+                            datetime.month as u8,
+                            datetime.day as u8,
+                            datetime.hour as u8,
+                            datetime.minute as u8,
+                            datetime.second as u8,
+                            datetime.microsecond,
+                            Some(
+                                Py::new(py, FixedTimezone::new(offset, datetime.tzname))?
+                                    .to_object(py)
+                                    .extract(py)?,
+                            ),
+                        )?;
+
+                        Ok(dt.to_object(py))
+                    }
+                    None => {
+                        let dt = PyDateTime::new(
+                            py,
+                            datetime.year as i32,
+                            datetime.month as u8,
+                            datetime.day as u8,
+                            datetime.hour as u8,
+                            datetime.minute as u8,
+                            datetime.second as u8,
+                            datetime.microsecond,
+                            None,
+                        )?;
+
+                        Ok(dt.to_object(py))
+                    }
+                },
+                (true, false) => {
+                    let dt = PyDate::new(
+                        py,
+                        datetime.year as i32,
+                        datetime.month as u8,
+                        datetime.day as u8,
+                    )?;
+
+                    Ok(dt.to_object(py))
+                }
+                (false, true) => match datetime.offset {
+                    Some(offset) => {
+                        let dt = PyTime::new(
+                            py,
+                            datetime.hour as u8,
+                            datetime.minute as u8,
+                            datetime.second as u8,
+                            datetime.microsecond,
+                            Some(
+                                Py::new(py, FixedTimezone::new(offset, datetime.tzname))?
+                                    .to_object(py)
+                                    .extract(py)?,
+                            ),
+                        )?;
+
+                        Ok(dt.to_object(py))
+                    }
+                    None => {
+                        let dt = PyTime::new(
+                            py,
+                            datetime.hour as u8,
+                            datetime.minute as u8,
+                            datetime.second as u8,
+                            datetime.microsecond,
+                            None,
+                        )?;
+
+                        Ok(dt.to_object(py))
+                    }
+                },
+                (_, _) => Err(exceptions::PyValueError::new_err(
+                    "Parsing error".to_string(),
+                )),
+            },
+            (None, Some(duration), None) => Ok(Py::new(
+                py,
+                Duration::new(
+                    Some(duration.years),
+                    Some(duration.months),
+                    Some(duration.weeks),
+                    Some(duration.days),
+                    Some(duration.hours),
+                    Some(duration.minutes),
+                    Some(duration.seconds),
+                    Some(duration.microseconds),
+                ),
+            )?
+            .to_object(py)),
+            (_, _, _) => Err(exceptions::PyValueError::new_err(
+                "Not yet implemented".to_string(),
+            )),
+        },
+        Err(error) => Err(exceptions::PyValueError::new_err(error.to_string())),
+    }
+}
diff --git a/rust/src/python/types/duration.rs b/rust/src/python/types/duration.rs
new file mode 100644
index 0000000..fc18f4e
--- /dev/null
+++ b/rust/src/python/types/duration.rs
@@ -0,0 +1,59 @@
+use pyo3::prelude::*;
+
+#[pyclass(module = "_pendulum")]
+pub struct Duration {
+    #[pyo3(get, set)]
+    pub years: u32,
+    #[pyo3(get, set)]
+    pub months: u32,
+    #[pyo3(get, set)]
+    pub weeks: u32,
+    #[pyo3(get, set)]
+    pub days: u32,
+    #[pyo3(get, set)]
+    pub hours: u32,
+    #[pyo3(get, set)]
+    pub minutes: u32,
+    #[pyo3(get, set)]
+    pub seconds: u32,
+    #[pyo3(get, set)]
+    pub microseconds: u32,
+}
+
+#[pymethods]
+impl Duration {
+    #[new]
+    #[pyo3(signature = (years=0, months=0, weeks=0, days=0, hours=0, minutes=0, seconds=0, microseconds=0))]
+    #[allow(clippy::too_many_arguments)]
+    pub fn new(
+        years: Option<u32>,
+        months: Option<u32>,
+        weeks: Option<u32>,
+        days: Option<u32>,
+        hours: Option<u32>,
+        minutes: Option<u32>,
+        seconds: Option<u32>,
+        microseconds: Option<u32>,
+    ) -> Self {
+        Self {
+            years: years.unwrap_or(0),
+            months: months.unwrap_or(0),
+            weeks: weeks.unwrap_or(0),
+            days: days.unwrap_or(0),
+            hours: hours.unwrap_or(0),
+            minutes: minutes.unwrap_or(0),
+            seconds: seconds.unwrap_or(0),
+            microseconds: microseconds.unwrap_or(0),
+        }
+    }
+
+    #[getter]
+    fn remaining_days(&self) -> PyResult<u32> {
+        Ok(self.days)
+    }
+
+    #[getter]
+    fn remaining_seconds(&self) -> PyResult<u32> {
+        Ok(self.seconds)
+    }
+}
diff --git a/rust/src/python/types/interval.rs b/rust/src/python/types/interval.rs
new file mode 100644
index 0000000..7137493
--- /dev/null
+++ b/rust/src/python/types/interval.rs
@@ -0,0 +1,46 @@
+use pyo3::prelude::*;
+
+use pyo3::types::PyDelta;
+
+#[pyclass(extends=PyDelta)]
+#[derive(Default)]
+pub struct Interval {
+    pub days: i32,
+    pub seconds: i32,
+    pub microseconds: i32,
+}
+
+#[pymethods]
+impl Interval {
+    #[new]
+    #[pyo3(signature = (days=0, seconds=0, microseconds=0, milliseconds=0, minutes=0, hours=0, weeks=0))]
+    pub fn new(
+        py: Python,
+        days: Option<i32>,
+        seconds: Option<i32>,
+        microseconds: Option<i32>,
+        milliseconds: Option<i32>,
+        minutes: Option<i32>,
+        hours: Option<i32>,
+        weeks: Option<i32>,
+    ) -> PyResult<Self> {
+        println!("{} days", 31);
+        PyDelta::new(
+            py,
+            days.unwrap_or(0),
+            seconds.unwrap_or(0),
+            microseconds.unwrap_or(0),
+            true,
+        )?;
+
+        let f = Ok(Self {
+            days: days.unwrap_or(0),
+            seconds: seconds.unwrap_or(0),
+            microseconds: microseconds.unwrap_or(0),
+        });
+
+        println!("{} days", 31);
+
+        f
+    }
+}
diff --git a/rust/src/python/types/mod.rs b/rust/src/python/types/mod.rs
new file mode 100644
index 0000000..cba11df
--- /dev/null
+++ b/rust/src/python/types/mod.rs
@@ -0,0 +1,7 @@
+mod duration;
+mod precise_diff;
+mod timezone;
+
+pub use duration::Duration;
+pub use precise_diff::PreciseDiff;
+pub use timezone::FixedTimezone;
diff --git a/rust/src/python/types/precise_diff.rs b/rust/src/python/types/precise_diff.rs
new file mode 100644
index 0000000..64ca3a6
--- /dev/null
+++ b/rust/src/python/types/precise_diff.rs
@@ -0,0 +1,53 @@
+use pyo3::prelude::*;
+
+#[pyclass(module = "_pendulum")]
+pub struct PreciseDiff {
+    #[pyo3(get, set)]
+    pub years: i32,
+    #[pyo3(get, set)]
+    pub months: i32,
+    #[pyo3(get, set)]
+    pub days: i32,
+    #[pyo3(get, set)]
+    pub hours: i32,
+    #[pyo3(get, set)]
+    pub minutes: i32,
+    #[pyo3(get, set)]
+    pub seconds: i32,
+    #[pyo3(get, set)]
+    pub microseconds: i32,
+    #[pyo3(get, set)]
+    pub total_days: i32,
+}
+
+#[pymethods]
+impl PreciseDiff {
+    #[new]
+    #[pyo3(signature = (years=0, months=0, days=0, hours=0, minutes=0, seconds=0, microseconds=0, total_days=0))]
+    #[allow(clippy::too_many_arguments)]
+    pub fn new(
+        years: Option<i32>,
+        months: Option<i32>,
+        days: Option<i32>,
+        hours: Option<i32>,
+        minutes: Option<i32>,
+        seconds: Option<i32>,
+        microseconds: Option<i32>,
+        total_days: Option<i32>,
+    ) -> Self {
+        Self {
+            years: years.unwrap_or(0),
+            months: months.unwrap_or(0),
+            days: days.unwrap_or(0),
+            hours: hours.unwrap_or(0),
+            minutes: minutes.unwrap_or(0),
+            seconds: seconds.unwrap_or(0),
+            microseconds: microseconds.unwrap_or(0),
+            total_days: total_days.unwrap_or(0),
+        }
+    }
+
+    fn __repr__(&self) -> String {
+        format!("PreciseDiff(years={}, months={}, days={}, hours={}, minutes={}, seconds={}, microseconds={}, total_days={})", self.years, self.months, self.days, self.hours, self.minutes, self.seconds, self.microseconds, self.total_days)
+    }
+}
diff --git a/rust/src/python/types/timezone.rs b/rust/src/python/types/timezone.rs
new file mode 100644
index 0000000..1a8bbad
--- /dev/null
+++ b/rust/src/python/types/timezone.rs
@@ -0,0 +1,52 @@
+use pyo3::prelude::*;
+use pyo3::types::{PyDelta, PyDict, PyTzInfo};
+
+#[pyclass(module = "_pendulum", extends = PyTzInfo)]
+#[derive(Clone)]
+pub struct FixedTimezone {
+    offset: i32,
+    name: Option<String>,
+}
+
+#[pymethods]
+impl FixedTimezone {
+    #[new]
+    pub fn new(offset: i32, name: Option<String>) -> Self {
+        Self { offset, name }
+    }
+
+    fn utcoffset<'p>(&self, py: Python<'p>, _dt: &PyAny) -> PyResult<&'p PyDelta> {
+        PyDelta::new(py, 0, self.offset, 0, true)
+    }
+
+    fn tzname(&self, _dt: &PyAny) -> String {
+        self.__str__()
+    }
+
+    fn dst<'p>(&self, py: Python<'p>, _dt: &PyAny) -> PyResult<&'p PyDelta> {
+        PyDelta::new(py, 0, 0, 0, true)
+    }
+
+    fn __repr__(&self) -> String {
+        format!(
+            "FixedTimezone({}, name=\"{}\")",
+            self.offset,
+            self.__str__()
+        )
+    }
+
+    fn __str__(&self) -> String {
+        if let Some(n) = &self.name {
+            n.clone()
+        } else {
+            let sign = if self.offset < 0 { "-" } else { "+" };
+            let minutes = self.offset.abs() / 60;
+            let (hour, minute) = (minutes / 60, minutes % 60);
+            format!("{sign}{hour:.2}:{minute:.2}")
+        }
+    }
+
+    fn __deepcopy__(&self, py: Python, _memo: &PyDict) -> PyResult<Py<Self>> {
+        Py::new(py, self.clone())
+    }
+}
diff --git a/pendulum/__init__.py b/src/pendulum/__init__.py
index 4491244..3863b76 100644
--- a/pendulum/__init__.py
+++ b/src/pendulum/__init__.py
@@ -4,27 +4,22 @@ import datetime as _datetime
 
 from typing import Union
 from typing import cast
+from typing import overload
 
 from pendulum.__version__ import __version__
 from pendulum.constants import DAYS_PER_WEEK
-from pendulum.constants import FRIDAY
 from pendulum.constants import HOURS_PER_DAY
 from pendulum.constants import MINUTES_PER_HOUR
-from pendulum.constants import MONDAY
 from pendulum.constants import MONTHS_PER_YEAR
-from pendulum.constants import SATURDAY
 from pendulum.constants import SECONDS_PER_DAY
 from pendulum.constants import SECONDS_PER_HOUR
 from pendulum.constants import SECONDS_PER_MINUTE
-from pendulum.constants import SUNDAY
-from pendulum.constants import THURSDAY
-from pendulum.constants import TUESDAY
-from pendulum.constants import WEDNESDAY
 from pendulum.constants import WEEKS_PER_YEAR
 from pendulum.constants import YEARS_PER_CENTURY
 from pendulum.constants import YEARS_PER_DECADE
 from pendulum.date import Date
 from pendulum.datetime import DateTime
+from pendulum.day import WeekDay
 from pendulum.duration import Duration
 from pendulum.formatting import Formatter
 from pendulum.helpers import format_diff
@@ -38,22 +33,59 @@ from pendulum.parser import parse
 from pendulum.testing.traveller import Traveller
 from pendulum.time import Time
 from pendulum.tz import UTC
+from pendulum.tz import fixed_timezone
 from pendulum.tz import local_timezone
 from pendulum.tz import set_local_timezone
 from pendulum.tz import test_local_timezone
-from pendulum.tz import timezone
 from pendulum.tz import timezones
 from pendulum.tz.timezone import FixedTimezone
 from pendulum.tz.timezone import Timezone
 
+
+MONDAY = WeekDay.MONDAY
+TUESDAY = WeekDay.TUESDAY
+WEDNESDAY = WeekDay.WEDNESDAY
+THURSDAY = WeekDay.THURSDAY
+FRIDAY = WeekDay.FRIDAY
+SATURDAY = WeekDay.SATURDAY
+SUNDAY = WeekDay.SUNDAY
+
 _TEST_NOW: DateTime | None = None
 _LOCALE = "en"
-_WEEK_STARTS_AT = MONDAY
-_WEEK_ENDS_AT = SUNDAY
+_WEEK_STARTS_AT: WeekDay = WeekDay.MONDAY
+_WEEK_ENDS_AT: WeekDay = WeekDay.SUNDAY
 
 _formatter = Formatter()
 
 
+@overload
+def timezone(name: int) -> FixedTimezone:
+    ...
+
+
+@overload
+def timezone(name: str) -> Timezone:
+    ...
+
+
+@overload
+def timezone(name: str | int) -> Timezone | FixedTimezone:
+    ...
+
+
+def timezone(name: str | int) -> Timezone | FixedTimezone:
+    """
+    Return a Timezone instance given its name.
+    """
+    if isinstance(name, int):
+        return fixed_timezone(name)
+
+    if name.lower() == "utc":
+        return UTC
+
+    return Timezone(name)
+
+
 def _safe_timezone(
     obj: str | float | _datetime.tzinfo | Timezone | FixedTimezone | None,
     dt: _datetime.datetime | None = None,
@@ -73,10 +105,10 @@ def _safe_timezone(
     elif isinstance(obj, _datetime.tzinfo):
         # zoneinfo
         if hasattr(obj, "key"):
-            obj = obj.key  # type: ignore
+            obj = obj.key
         # pytz
         elif hasattr(obj, "localize"):
-            obj = obj.zone  # type: ignore
+            obj = obj.zone  # type: ignore[attr-defined]
         elif obj.tzname(None) == "UTC":
             return UTC
         else:
@@ -169,34 +201,47 @@ def time(hour: int, minute: int = 0, second: int = 0, microsecond: int = 0) -> T
     return Time(hour, minute, second, microsecond)
 
 
+@overload
 def instance(
-    dt: _datetime.datetime,
+    obj: _datetime.datetime,
     tz: str | Timezone | FixedTimezone | _datetime.tzinfo | None = UTC,
 ) -> DateTime:
+    ...
+
+
+@overload
+def instance(
+    obj: _datetime.date,
+    tz: str | Timezone | FixedTimezone | _datetime.tzinfo | None = UTC,
+) -> Date:
+    ...
+
+
+@overload
+def instance(
+    obj: _datetime.time,
+    tz: str | Timezone | FixedTimezone | _datetime.tzinfo | None = UTC,
+) -> Time:
+    ...
+
+
+def instance(
+    obj: _datetime.datetime | _datetime.date | _datetime.time,
+    tz: str | Timezone | FixedTimezone | _datetime.tzinfo | None = UTC,
+) -> DateTime | Date | Time:
     """
-    Create a DateTime instance from a datetime one.
+    Create a DateTime/Date/Time instance from a datetime/date/time native one.
     """
-    if not isinstance(dt, _datetime.datetime):
-        raise ValueError("instance() only accepts datetime objects.")
-
-    if isinstance(dt, DateTime):
-        return dt
+    if isinstance(obj, (DateTime, Date, Time)):
+        return obj
 
-    tz = dt.tzinfo or tz
+    if isinstance(obj, _datetime.date) and not isinstance(obj, _datetime.datetime):
+        return date(obj.year, obj.month, obj.day)
 
-    if tz is not None:
-        tz = _safe_timezone(tz, dt=dt)
+    if isinstance(obj, _datetime.time):
+        return Time.instance(obj, tz=tz)
 
-    return datetime(
-        dt.year,
-        dt.month,
-        dt.day,
-        dt.hour,
-        dt.minute,
-        dt.second,
-        dt.microsecond,
-        tz=cast(Union[str, int, Timezone, FixedTimezone, None], tz),
-    )
+    return DateTime.instance(obj, tz=tz)
 
 
 def now(tz: str | Timezone | None = None) -> DateTime:
@@ -215,14 +260,14 @@ def today(tz: str | Timezone = "local") -> DateTime:
 
 def tomorrow(tz: str | Timezone = "local") -> DateTime:
     """
-    Create a DateTime instance for today.
+    Create a DateTime instance for tomorrow.
     """
     return today(tz).add(days=1)
 
 
 def yesterday(tz: str | Timezone = "local") -> DateTime:
     """
-    Create a DateTime instance for today.
+    Create a DateTime instance for yesterday.
     """
     return today(tz).subtract(days=1)
 
@@ -305,19 +350,12 @@ travel_back = _traveller.travel_back
 __all__ = [
     "__version__",
     "DAYS_PER_WEEK",
-    "FRIDAY",
     "HOURS_PER_DAY",
     "MINUTES_PER_HOUR",
-    "MONDAY",
     "MONTHS_PER_YEAR",
-    "SATURDAY",
     "SECONDS_PER_DAY",
     "SECONDS_PER_HOUR",
     "SECONDS_PER_MINUTE",
-    "SUNDAY",
-    "THURSDAY",
-    "TUESDAY",
-    "WEDNESDAY",
     "WEEKS_PER_YEAR",
     "YEARS_PER_CENTURY",
     "YEARS_PER_DECADE",
@@ -325,6 +363,7 @@ __all__ = [
     "DateTime",
     "Duration",
     "Formatter",
+    "WeekDay",
     "date",
     "datetime",
     "duration",
diff --git a/src/pendulum/__version__.py b/src/pendulum/__version__.py
new file mode 100644
index 0000000..d6e60fe
--- /dev/null
+++ b/src/pendulum/__version__.py
@@ -0,0 +1,4 @@
+from __future__ import annotations
+
+
+__version__ = "3.0.0"
diff --git a/pendulum/_extensions/helpers.py b/src/pendulum/_helpers.py
index 01066a3..5f7bd03 100644
--- a/pendulum/_extensions/helpers.py
+++ b/src/pendulum/_helpers.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 import datetime
 import math
 
-from collections import namedtuple
+from typing import NamedTuple
 from typing import cast
 
 from pendulum.constants import DAY_OF_WEEK_TABLE
@@ -25,12 +25,7 @@ from pendulum.tz.timezone import Timezone
 from pendulum.utils._compat import zoneinfo
 
 
-class PreciseDiff(
-    namedtuple(
-        "PreciseDiff",
-        "years months days " "hours minutes seconds microseconds " "total_days",
-    )
-):
+class PreciseDiff(NamedTuple):
     years: int
     months: int
     days: int
@@ -89,28 +84,6 @@ def days_in_year(year: int) -> int:
     return DAYS_PER_N_YEAR
 
 
-def timestamp(dt: datetime.datetime) -> int:
-    year = dt.year
-
-    result = (year - 1970) * 365 + MONTHS_OFFSETS[0][dt.month]
-    result += (year - 1968) // 4
-    result -= (year - 1900) // 100
-    result += (year - 1600) // 400
-
-    if is_leap(year) and dt.month < 3:
-        result -= 1
-
-    result += dt.day - 1
-    result *= 24
-    result += dt.hour
-    result *= 60
-    result += dt.minute
-    result *= 60
-    result += dt.second
-
-    return result
-
-
 def local_time(
     unix_time: int, utc_offset: int, microseconds: int
 ) -> tuple[int, int, int, int, int, int, int]:
@@ -119,7 +92,7 @@ def local_time(
     for a particular transition type.
     """
     year = EPOCH_YEAR
-    seconds = int(math.floor(unix_time))
+    seconds = math.floor(unix_time)
 
     # Shift to a base year that is 400-year aligned.
     if seconds >= 0:
@@ -174,10 +147,8 @@ def local_time(
         month -= 1
 
     # Handle hours, minutes, seconds and microseconds
-    hour = seconds // SECS_PER_HOUR
-    seconds %= SECS_PER_HOUR
-    minute = seconds // SECS_PER_MIN
-    second = seconds % SECS_PER_MIN
+    hour, seconds = divmod(seconds, SECS_PER_HOUR)
+    minute, second = divmod(seconds, SECS_PER_MIN)
 
     return year, month, day, hour, minute, second, microseconds
 
@@ -353,12 +324,12 @@ def _get_tzinfo_name(tzinfo: datetime.tzinfo | None) -> str | None:
 
     if hasattr(tzinfo, "key"):
         # zoneinfo timezone
-        return cast(str, cast(zoneinfo.ZoneInfo, tzinfo).key)
+        return cast(zoneinfo.ZoneInfo, tzinfo).key
     elif hasattr(tzinfo, "name"):
         # Pendulum timezone
         return cast(Timezone, tzinfo).name
     elif hasattr(tzinfo, "zone"):
         # pytz timezone
-        return tzinfo.zone  # type: ignore
+        return tzinfo.zone  # type: ignore[no-any-return]
 
     return None
diff --git a/pendulum/_extensions/_helpers.pyi b/src/pendulum/_pendulum.pyi
index 99a5397..74d7d83 100644
--- a/pendulum/_extensions/_helpers.pyi
+++ b/src/pendulum/_pendulum.pyi
@@ -1,22 +1,23 @@
 from __future__ import annotations
 
-from collections import namedtuple
 from datetime import date
 from datetime import datetime
+from datetime import time
+from typing import NamedTuple
 
-def days_in_year(year: int) -> int: ...
-def is_leap(year: int) -> bool: ...
-def is_long_year(year: int) -> bool: ...
-def local_time(
-    unix_time: int, utc_offset: int, microseconds: int
-) -> tuple[int, int, int, int, int, int, int]: ...
+class Duration:
+    years: int = 0
+    months: int = 0
+    weeks: int = 0
+    days: int = 0
+    remaining_days: int = 0
+    hours: int = 0
+    minutes: int = 0
+    seconds: int = 0
+    remaining_seconds: int = 0
+    microseconds: int = 0
 
-class PreciseDiff(
-    namedtuple(
-        "PreciseDiff",
-        "years months days " "hours minutes seconds microseconds " "total_days",
-    )
-):
+class PreciseDiff(NamedTuple):
     years: int
     months: int
     days: int
@@ -26,6 +27,14 @@ class PreciseDiff(
     microseconds: int
     total_days: int
 
+def parse_iso8601(
+    text: str,
+) -> datetime | date | time | Duration: ...
+def days_in_year(year: int) -> int: ...
+def is_leap(year: int) -> bool: ...
+def is_long_year(year: int) -> bool: ...
+def local_time(
+    unix_time: int, utc_offset: int, microseconds: int
+) -> tuple[int, int, int, int, int, int, int]: ...
 def precise_diff(d1: datetime | date, d2: datetime | date) -> PreciseDiff: ...
-def timestamp(dt: datetime) -> int: ...
 def week_day(year: int, month: int, day: int) -> int: ...
diff --git a/pendulum/constants.py b/src/pendulum/constants.py
index a3d2a18..51eb059 100644
--- a/pendulum/constants.py
+++ b/src/pendulum/constants.py
@@ -1,13 +1,6 @@
 # The day constants
 from __future__ import annotations
 
-SUNDAY = 0
-MONDAY = 1
-TUESDAY = 2
-WEDNESDAY = 3
-THURSDAY = 4
-FRIDAY = 5
-SATURDAY = 6
 
 # Number of X in Y.
 YEARS_PER_CENTURY = 100
diff --git a/pendulum/date.py b/src/pendulum/date.py
index 4e2655b..e7b862c 100644
--- a/pendulum/date.py
+++ b/src/pendulum/date.py
@@ -1,3 +1,5 @@
+# The following is only needed because of Python 3.7
+# mypy: no-warn-unused-ignores
 from __future__ import annotations
 
 import calendar
@@ -6,55 +8,52 @@ import math
 from datetime import date
 from datetime import datetime
 from datetime import timedelta
+from typing import TYPE_CHECKING
+from typing import ClassVar
 from typing import NoReturn
 from typing import cast
 from typing import overload
 
 import pendulum
 
-from pendulum.constants import FRIDAY
-from pendulum.constants import MONDAY
 from pendulum.constants import MONTHS_PER_YEAR
-from pendulum.constants import SATURDAY
-from pendulum.constants import SUNDAY
-from pendulum.constants import THURSDAY
-from pendulum.constants import TUESDAY
-from pendulum.constants import WEDNESDAY
 from pendulum.constants import YEARS_PER_CENTURY
 from pendulum.constants import YEARS_PER_DECADE
+from pendulum.day import WeekDay
 from pendulum.exceptions import PendulumException
 from pendulum.helpers import add_duration
 from pendulum.interval import Interval
 from pendulum.mixins.default import FormattableMixin
 
 
+if TYPE_CHECKING:
+    from typing_extensions import Self
+    from typing_extensions import SupportsIndex
+
+
 class Date(FormattableMixin, date):
-    # Names of days of the week
-    _days = {
-        SUNDAY: "Sunday",
-        MONDAY: "Monday",
-        TUESDAY: "Tuesday",
-        WEDNESDAY: "Wednesday",
-        THURSDAY: "Thursday",
-        FRIDAY: "Friday",
-        SATURDAY: "Saturday",
-    }
-
-    _MODIFIERS_VALID_UNITS = ["day", "week", "month", "year", "decade", "century"]
+    _MODIFIERS_VALID_UNITS: ClassVar[list[str]] = [
+        "day",
+        "week",
+        "month",
+        "year",
+        "decade",
+        "century",
+    ]
 
     # Getters/Setters
 
     def set(
         self, year: int | None = None, month: int | None = None, day: int | None = None
-    ) -> Date:
+    ) -> Self:
         return self.replace(year=year, month=month, day=day)
 
     @property
-    def day_of_week(self) -> int:
+    def day_of_week(self) -> WeekDay:
         """
         Returns the day of the week (0-6).
         """
-        return self.isoweekday() % 7
+        return WeekDay(self.weekday())
 
     @property
     def day_of_year(self) -> int:
@@ -75,9 +74,7 @@ class Date(FormattableMixin, date):
 
     @property
     def week_of_month(self) -> int:
-        first_day_of_month = self.replace(day=1)
-
-        return self.week_of_year - first_day_of_month.week_of_year + 1
+        return math.ceil((self.day + self.first_of("month").isoweekday() - 1) / 7)
 
     @property
     def age(self) -> int:
@@ -85,7 +82,7 @@ class Date(FormattableMixin, date):
 
     @property
     def quarter(self) -> int:
-        return int(math.ceil(self.month / 3))
+        return math.ceil(self.month / 3)
 
     # String Formatting
 
@@ -110,7 +107,7 @@ class Date(FormattableMixin, date):
 
     # COMPARISONS
 
-    def closest(self, dt1: date, dt2: date) -> Date:
+    def closest(self, dt1: date, dt2: date) -> Self:
         """
         Get the closest date from the instance.
         """
@@ -122,7 +119,7 @@ class Date(FormattableMixin, date):
 
         return dt2
 
-    def farthest(self, dt1: date, dt2: date) -> Date:
+    def farthest(self, dt1: date, dt2: date) -> Self:
         """
         Get the farthest date from the instance.
         """
@@ -173,22 +170,23 @@ class Date(FormattableMixin, date):
         Compares the date/month values of the two dates.
         """
         if dt is None:
-            dt = Date.today()
+            dt = self.__class__.today()
 
         instance = self.__class__(dt.year, dt.month, dt.day)
 
         return (self.month, self.day) == (instance.month, instance.day)
 
     # the additional method for checking if today is the anniversary day
-    # the alias is provided to start using a new name and keep the backward compatibility
-    # the old name can be completely replaced with the new in one of the future versions
+    # the alias is provided to start using a new name and keep the backward
+    # compatibility the old name can be completely replaced with the new in
+    # one of the future versions
     is_birthday = is_anniversary
 
     # ADDITIONS AND SUBTRACTIONS
 
     def add(
         self, years: int = 0, months: int = 0, weeks: int = 0, days: int = 0
-    ) -> Date:
+    ) -> Self:
         """
         Add duration to the instance.
 
@@ -209,7 +207,7 @@ class Date(FormattableMixin, date):
 
     def subtract(
         self, years: int = 0, months: int = 0, weeks: int = 0, days: int = 0
-    ) -> Date:
+    ) -> Self:
         """
         Remove duration from the instance.
 
@@ -220,7 +218,7 @@ class Date(FormattableMixin, date):
         """
         return self.add(years=-years, months=-months, weeks=-weeks, days=-days)
 
-    def _add_timedelta(self, delta: timedelta) -> Date:
+    def _add_timedelta(self, delta: timedelta) -> Self:
         """
         Add timedelta duration to the instance.
 
@@ -236,7 +234,7 @@ class Date(FormattableMixin, date):
 
         return self.add(days=delta.days)
 
-    def _subtract_timedelta(self, delta: timedelta) -> Date:
+    def _subtract_timedelta(self, delta: timedelta) -> Self:
         """
         Remove timedelta duration from the instance.
 
@@ -252,25 +250,25 @@ class Date(FormattableMixin, date):
 
         return self.subtract(days=delta.days)
 
-    def __add__(self, other: timedelta) -> Date:
+    def __add__(self, other: timedelta) -> Self:
         if not isinstance(other, timedelta):
             return NotImplemented
 
         return self._add_timedelta(other)
 
-    @overload
-    def __sub__(self, delta: timedelta) -> Date:
+    @overload  # type: ignore[override]  # this is only needed because of Python 3.7
+    def __sub__(self, __delta: timedelta) -> Self:
         ...
 
     @overload
-    def __sub__(self, dt: datetime) -> NoReturn:
+    def __sub__(self, __dt: datetime) -> NoReturn:
         ...
 
     @overload
-    def __sub__(self, dt: Date) -> Interval:
+    def __sub__(self, __dt: Self) -> Interval:
         ...
 
-    def __sub__(self, other: timedelta | date) -> Date | Interval:
+    def __sub__(self, other: timedelta | date) -> Self | Interval:
         if isinstance(other, timedelta):
             return self._subtract_timedelta(other)
 
@@ -335,7 +333,7 @@ class Date(FormattableMixin, date):
 
     # MODIFIERS
 
-    def start_of(self, unit: str) -> Date:
+    def start_of(self, unit: str) -> Self:
         """
         Returns a copy of the instance with the time reset
         with the following rules:
@@ -352,9 +350,9 @@ class Date(FormattableMixin, date):
         if unit not in self._MODIFIERS_VALID_UNITS:
             raise ValueError(f'Invalid unit "{unit}" for start_of()')
 
-        return cast(Date, getattr(self, f"_start_of_{unit}")())
+        return cast("Self", getattr(self, f"_start_of_{unit}")())
 
-    def end_of(self, unit: str) -> Date:
+    def end_of(self, unit: str) -> Self:
         """
         Returns a copy of the instance with the time reset
         with the following rules:
@@ -370,45 +368,45 @@ class Date(FormattableMixin, date):
         if unit not in self._MODIFIERS_VALID_UNITS:
             raise ValueError(f'Invalid unit "{unit}" for end_of()')
 
-        return cast(Date, getattr(self, f"_end_of_{unit}")())
+        return cast("Self", getattr(self, f"_end_of_{unit}")())
 
-    def _start_of_day(self) -> Date:
+    def _start_of_day(self) -> Self:
         """
         Compatibility method.
         """
         return self
 
-    def _end_of_day(self) -> Date:
+    def _end_of_day(self) -> Self:
         """
         Compatibility method
         """
         return self
 
-    def _start_of_month(self) -> Date:
+    def _start_of_month(self) -> Self:
         """
         Reset the date to the first day of the month.
         """
         return self.set(self.year, self.month, 1)
 
-    def _end_of_month(self) -> Date:
+    def _end_of_month(self) -> Self:
         """
         Reset the date to the last day of the month.
         """
         return self.set(self.year, self.month, self.days_in_month)
 
-    def _start_of_year(self) -> Date:
+    def _start_of_year(self) -> Self:
         """
         Reset the date to the first day of the year.
         """
         return self.set(self.year, 1, 1)
 
-    def _end_of_year(self) -> Date:
+    def _end_of_year(self) -> Self:
         """
         Reset the date to the last day of the year.
         """
         return self.set(self.year, 12, 31)
 
-    def _start_of_decade(self) -> Date:
+    def _start_of_decade(self) -> Self:
         """
         Reset the date to the first day of the decade.
         """
@@ -416,7 +414,7 @@ class Date(FormattableMixin, date):
 
         return self.set(year, 1, 1)
 
-    def _end_of_decade(self) -> Date:
+    def _end_of_decade(self) -> Self:
         """
         Reset the date to the last day of the decade.
         """
@@ -424,7 +422,7 @@ class Date(FormattableMixin, date):
 
         return self.set(year, 12, 31)
 
-    def _start_of_century(self) -> Date:
+    def _start_of_century(self) -> Self:
         """
         Reset the date to the first day of the century.
         """
@@ -432,7 +430,7 @@ class Date(FormattableMixin, date):
 
         return self.set(year, 1, 1)
 
-    def _end_of_century(self) -> Date:
+    def _end_of_century(self) -> Self:
         """
         Reset the date to the last day of the century.
         """
@@ -440,7 +438,7 @@ class Date(FormattableMixin, date):
 
         return self.set(year, 12, 31)
 
-    def _start_of_week(self) -> Date:
+    def _start_of_week(self) -> Self:
         """
         Reset the date to the first day of the week.
         """
@@ -451,7 +449,7 @@ class Date(FormattableMixin, date):
 
         return dt.start_of("day")
 
-    def _end_of_week(self) -> Date:
+    def _end_of_week(self) -> Self:
         """
         Reset the date to the last day of the week.
         """
@@ -462,7 +460,7 @@ class Date(FormattableMixin, date):
 
         return dt.end_of("day")
 
-    def next(self, day_of_week: int | None = None) -> Date:
+    def next(self, day_of_week: WeekDay | None = None) -> Self:
         """
         Modify to the next occurrence of a given day of the week.
         If no day_of_week is provided, modify to the next occurrence
@@ -474,7 +472,7 @@ class Date(FormattableMixin, date):
         if day_of_week is None:
             day_of_week = self.day_of_week
 
-        if day_of_week < SUNDAY or day_of_week > SATURDAY:
+        if day_of_week < WeekDay.MONDAY or day_of_week > WeekDay.SUNDAY:
             raise ValueError("Invalid day of week")
 
         dt = self.add(days=1)
@@ -483,7 +481,7 @@ class Date(FormattableMixin, date):
 
         return dt
 
-    def previous(self, day_of_week: int | None = None) -> Date:
+    def previous(self, day_of_week: WeekDay | None = None) -> Self:
         """
         Modify to the previous occurrence of a given day of the week.
         If no day_of_week is provided, modify to the previous occurrence
@@ -495,7 +493,7 @@ class Date(FormattableMixin, date):
         if day_of_week is None:
             day_of_week = self.day_of_week
 
-        if day_of_week < SUNDAY or day_of_week > SATURDAY:
+        if day_of_week < WeekDay.MONDAY or day_of_week > WeekDay.SUNDAY:
             raise ValueError("Invalid day of week")
 
         dt = self.subtract(days=1)
@@ -504,12 +502,13 @@ class Date(FormattableMixin, date):
 
         return dt
 
-    def first_of(self, unit: str, day_of_week: int | None = None) -> Date:
+    def first_of(self, unit: str, day_of_week: WeekDay | None = None) -> Self:
         """
         Returns an instance set to the first occurrence
         of a given day of the week in the current unit.
         If no day_of_week is provided, modify to the first day of the unit.
-        Use the supplied consts to indicate the desired day_of_week, ex. pendulum.MONDAY.
+        Use the supplied consts to indicate the desired day_of_week,
+        ex. pendulum.MONDAY.
 
         Supported units are month, quarter and year.
 
@@ -519,14 +518,15 @@ class Date(FormattableMixin, date):
         if unit not in ["month", "quarter", "year"]:
             raise ValueError(f'Invalid unit "{unit}" for first_of()')
 
-        return cast(Date, getattr(self, f"_first_of_{unit}")(day_of_week))
+        return cast("Self", getattr(self, f"_first_of_{unit}")(day_of_week))
 
-    def last_of(self, unit: str, day_of_week: int | None = None) -> Date:
+    def last_of(self, unit: str, day_of_week: WeekDay | None = None) -> Self:
         """
         Returns an instance set to the last occurrence
         of a given day of the week in the current unit.
         If no day_of_week is provided, modify to the last day of the unit.
-        Use the supplied consts to indicate the desired day_of_week, ex. pendulum.MONDAY.
+        Use the supplied consts to indicate the desired day_of_week,
+        ex. pendulum.MONDAY.
 
         Supported units are month, quarter and year.
 
@@ -536,9 +536,9 @@ class Date(FormattableMixin, date):
         if unit not in ["month", "quarter", "year"]:
             raise ValueError(f'Invalid unit "{unit}" for first_of()')
 
-        return cast(Date, getattr(self, f"_last_of_{unit}")(day_of_week))
+        return cast("Self", getattr(self, f"_last_of_{unit}")(day_of_week))
 
-    def nth_of(self, unit: str, nth: int, day_of_week: int) -> Date:
+    def nth_of(self, unit: str, nth: int, day_of_week: WeekDay) -> Self:
         """
         Returns a new instance set to the given occurrence
         of a given day of the week in the current unit.
@@ -555,16 +555,16 @@ class Date(FormattableMixin, date):
         if unit not in ["month", "quarter", "year"]:
             raise ValueError(f'Invalid unit "{unit}" for first_of()')
 
-        dt = cast(Date, getattr(self, f"_nth_of_{unit}")(nth, day_of_week))
+        dt = cast("Self", getattr(self, f"_nth_of_{unit}")(nth, day_of_week))
         if not dt:
             raise PendulumException(
-                f"Unable to find occurence {nth}"
-                f" of {self._days[day_of_week]} in {unit}"
+                f"Unable to find occurrence {nth}"
+                f" of {WeekDay(day_of_week).name.capitalize()} in {unit}"
             )
 
         return dt
 
-    def _first_of_month(self, day_of_week: int) -> Date:
+    def _first_of_month(self, day_of_week: WeekDay) -> Self:
         """
         Modify to the first occurrence of a given day of the week
         in the current month. If no day_of_week is provided,
@@ -580,7 +580,7 @@ class Date(FormattableMixin, date):
 
         month = calendar.monthcalendar(dt.year, dt.month)
 
-        calendar_day = (day_of_week - 1) % 7
+        calendar_day = day_of_week
 
         if month[0][calendar_day] > 0:
             day_of_month = month[0][calendar_day]
@@ -589,7 +589,7 @@ class Date(FormattableMixin, date):
 
         return dt.set(day=day_of_month)
 
-    def _last_of_month(self, day_of_week: int | None = None) -> Date:
+    def _last_of_month(self, day_of_week: WeekDay | None = None) -> Self:
         """
         Modify to the last occurrence of a given day of the week
         in the current month. If no day_of_week is provided,
@@ -605,7 +605,7 @@ class Date(FormattableMixin, date):
 
         month = calendar.monthcalendar(dt.year, dt.month)
 
-        calendar_day = (day_of_week - 1) % 7
+        calendar_day = day_of_week
 
         if month[-1][calendar_day] > 0:
             day_of_month = month[-1][calendar_day]
@@ -614,7 +614,7 @@ class Date(FormattableMixin, date):
 
         return dt.set(day=day_of_month)
 
-    def _nth_of_month(self, nth: int, day_of_week: int) -> Date | None:
+    def _nth_of_month(self, nth: int, day_of_week: WeekDay) -> Self | None:
         """
         Modify to the given occurrence of a given day of the week
         in the current month. If the calculated occurrence is outside,
@@ -635,7 +635,7 @@ class Date(FormattableMixin, date):
 
         return None
 
-    def _first_of_quarter(self, day_of_week: int | None = None) -> Date:
+    def _first_of_quarter(self, day_of_week: WeekDay | None = None) -> Self:
         """
         Modify to the first occurrence of a given day of the week
         in the current quarter. If no day_of_week is provided,
@@ -646,7 +646,7 @@ class Date(FormattableMixin, date):
             "month", day_of_week
         )
 
-    def _last_of_quarter(self, day_of_week: int | None = None) -> Date:
+    def _last_of_quarter(self, day_of_week: WeekDay | None = None) -> Self:
         """
         Modify to the last occurrence of a given day of the week
         in the current quarter. If no day_of_week is provided,
@@ -655,7 +655,7 @@ class Date(FormattableMixin, date):
         """
         return self.set(self.year, self.quarter * 3, 1).last_of("month", day_of_week)
 
-    def _nth_of_quarter(self, nth: int, day_of_week: int) -> Date | None:
+    def _nth_of_quarter(self, nth: int, day_of_week: WeekDay) -> Self | None:
         """
         Modify to the given occurrence of a given day of the week
         in the current quarter. If the calculated occurrence is outside,
@@ -678,7 +678,7 @@ class Date(FormattableMixin, date):
 
         return self.set(self.year, dt.month, dt.day)
 
-    def _first_of_year(self, day_of_week: int | None = None) -> Date:
+    def _first_of_year(self, day_of_week: WeekDay | None = None) -> Self:
         """
         Modify to the first occurrence of a given day of the week
         in the current year. If no day_of_week is provided,
@@ -687,7 +687,7 @@ class Date(FormattableMixin, date):
         """
         return self.set(month=1).first_of("month", day_of_week)
 
-    def _last_of_year(self, day_of_week: int | None = None) -> Date:
+    def _last_of_year(self, day_of_week: WeekDay | None = None) -> Self:
         """
         Modify to the last occurrence of a given day of the week
         in the current year. If no day_of_week is provided,
@@ -696,7 +696,7 @@ class Date(FormattableMixin, date):
         """
         return self.set(month=MONTHS_PER_YEAR).last_of("month", day_of_week)
 
-    def _nth_of_year(self, nth: int, day_of_week: int) -> Date | None:
+    def _nth_of_year(self, nth: int, day_of_week: WeekDay) -> Self | None:
         """
         Modify to the given occurrence of a given day of the week
         in the current year. If the calculated occurrence is outside,
@@ -717,7 +717,7 @@ class Date(FormattableMixin, date):
 
         return self.set(self.year, dt.month, dt.day)
 
-    def average(self, dt: date | None = None) -> Date:
+    def average(self, dt: date | None = None) -> Self:
         """
         Modify the current instance to the average
         of a given instance (default now) and the current instance.
@@ -730,29 +730,29 @@ class Date(FormattableMixin, date):
     # Native methods override
 
     @classmethod
-    def today(cls) -> Date:
+    def today(cls) -> Self:
         dt = date.today()
 
         return cls(dt.year, dt.month, dt.day)
 
     @classmethod
-    def fromtimestamp(cls, t: float) -> Date:
+    def fromtimestamp(cls, t: float) -> Self:
         dt = super().fromtimestamp(t)
 
         return cls(dt.year, dt.month, dt.day)
 
     @classmethod
-    def fromordinal(cls, n: int) -> Date:
+    def fromordinal(cls, n: int) -> Self:
         dt = super().fromordinal(n)
 
         return cls(dt.year, dt.month, dt.day)
 
     def replace(
         self,
-        year: int | None = None,
-        month: int | None = None,
-        day: int | None = None,
-    ) -> Date:
+        year: SupportsIndex | None = None,
+        month: SupportsIndex | None = None,
+        day: SupportsIndex | None = None,
+    ) -> Self:
         year = year if year is not None else self.year
         month = month if month is not None else self.month
         day = day if day is not None else self.day
diff --git a/pendulum/datetime.py b/src/pendulum/datetime.py
index 52ad3cc..752a9ac 100644
--- a/pendulum/datetime.py
+++ b/src/pendulum/datetime.py
@@ -2,10 +2,12 @@ from __future__ import annotations
 
 import calendar
 import datetime
+import traceback
 
 from typing import TYPE_CHECKING
 from typing import Any
 from typing import Callable
+from typing import ClassVar
 from typing import Optional
 from typing import cast
 from typing import overload
@@ -22,14 +24,13 @@ from pendulum.constants import RFC1036
 from pendulum.constants import RFC1123
 from pendulum.constants import RFC2822
 from pendulum.constants import RSS
-from pendulum.constants import SATURDAY
 from pendulum.constants import SECONDS_PER_DAY
 from pendulum.constants import SECONDS_PER_MINUTE
-from pendulum.constants import SUNDAY
 from pendulum.constants import W3C
 from pendulum.constants import YEARS_PER_CENTURY
 from pendulum.constants import YEARS_PER_DECADE
 from pendulum.date import Date
+from pendulum.day import WeekDay
 from pendulum.exceptions import PendulumException
 from pendulum.helpers import add_duration
 from pendulum.interval import Interval
@@ -38,32 +39,36 @@ from pendulum.tz import UTC
 from pendulum.tz import local_timezone
 from pendulum.tz.timezone import FixedTimezone
 from pendulum.tz.timezone import Timezone
-from pendulum.utils._compat import PY38
+
 
 if TYPE_CHECKING:
-    from typing import Literal
+    from typing_extensions import Literal
+    from typing_extensions import Self
+    from typing_extensions import SupportsIndex
 
 
 class DateTime(datetime.datetime, Date):
-    EPOCH: DateTime
+    EPOCH: ClassVar[DateTime]
+    min: ClassVar[DateTime]
+    max: ClassVar[DateTime]
 
     # Formats
 
-    _FORMATS: dict[str, str | Callable[[datetime.datetime], str]] = {
+    _FORMATS: ClassVar[dict[str, str | Callable[[datetime.datetime], str]]] = {
         "atom": ATOM,
         "cookie": COOKIE,
-        "iso8601": lambda dt: dt.isoformat(),
+        "iso8601": lambda dt: dt.isoformat("T"),
         "rfc822": RFC822,
         "rfc850": RFC850,
         "rfc1036": RFC1036,
         "rfc1123": RFC1123,
         "rfc2822": RFC2822,
-        "rfc3339": lambda dt: dt.isoformat(),
+        "rfc3339": lambda dt: dt.isoformat("T"),
         "rss": RSS,
         "w3c": W3C,
     }
 
-    _MODIFIERS_VALID_UNITS: list[str] = [
+    _MODIFIERS_VALID_UNITS: ClassVar[list[str]] = [
         "second",
         "minute",
         "hour",
@@ -80,17 +85,17 @@ class DateTime(datetime.datetime, Date):
     @classmethod
     def create(
         cls,
-        year: int,
-        month: int,
-        day: int,
-        hour: int = 0,
-        minute: int = 0,
-        second: int = 0,
-        microsecond: int = 0,
+        year: SupportsIndex,
+        month: SupportsIndex,
+        day: SupportsIndex,
+        hour: SupportsIndex = 0,
+        minute: SupportsIndex = 0,
+        second: SupportsIndex = 0,
+        microsecond: SupportsIndex = 0,
         tz: str | float | Timezone | FixedTimezone | None | datetime.tzinfo = UTC,
         fold: int = 1,
         raise_on_unknown_times: bool = False,
-    ) -> DateTime:
+    ) -> Self:
         """
         Creates a new DateTime instance from a specific date and time.
         """
@@ -116,20 +121,43 @@ class DateTime(datetime.datetime, Date):
             fold=dt.fold,
         )
 
+    @classmethod
+    def instance(
+        cls,
+        dt: datetime.datetime,
+        tz: str | Timezone | FixedTimezone | datetime.tzinfo | None = UTC,
+    ) -> Self:
+        tz = dt.tzinfo or tz
+
+        if tz is not None:
+            tz = pendulum._safe_timezone(tz, dt=dt)
+
+        return cls.create(
+            dt.year,
+            dt.month,
+            dt.day,
+            dt.hour,
+            dt.minute,
+            dt.second,
+            dt.microsecond,
+            tz=tz,
+            fold=dt.fold,
+        )
+
     @overload
     @classmethod
-    def now(cls, tz: datetime.tzinfo | None = None) -> DateTime:
+    def now(cls, tz: datetime.tzinfo | None = None) -> Self:
         ...
 
     @overload
     @classmethod
-    def now(cls, tz: str | Timezone | FixedTimezone | None = None) -> DateTime:
+    def now(cls, tz: str | Timezone | FixedTimezone | None = None) -> Self:
         ...
 
     @classmethod
     def now(
         cls, tz: str | Timezone | FixedTimezone | datetime.tzinfo | None = None
-    ) -> DateTime:
+    ) -> Self:
         """
         Get a DateTime instance for the current date and time.
         """
@@ -155,19 +183,19 @@ class DateTime(datetime.datetime, Date):
         )
 
     @classmethod
-    def utcnow(cls) -> DateTime:
+    def utcnow(cls) -> Self:
         """
         Get a DateTime instance for the current date and time in UTC.
         """
         return cls.now(UTC)
 
     @classmethod
-    def today(cls) -> DateTime:
+    def today(cls) -> Self:
         return cls.now()
 
     @classmethod
-    def strptime(cls, time: str, fmt: str) -> DateTime:
-        return pendulum.instance(datetime.datetime.strptime(time, fmt))
+    def strptime(cls, time: str, fmt: str) -> Self:
+        return cls.instance(datetime.datetime.strptime(time, fmt))
 
     # Getters/Setters
 
@@ -181,7 +209,7 @@ class DateTime(datetime.datetime, Date):
         second: int | None = None,
         microsecond: int | None = None,
         tz: str | float | Timezone | FixedTimezone | datetime.tzinfo | None = None,
-    ) -> DateTime:
+    ) -> Self:
         if year is None:
             year = self.year
         if month is None:
@@ -199,8 +227,8 @@ class DateTime(datetime.datetime, Date):
         if tz is None:
             tz = self.tz
 
-        return DateTime.create(
-            year, month, day, hour, minute, second, microsecond, tz=tz
+        return self.__class__.create(
+            year, month, day, hour, minute, second, microsecond, tz=tz, fold=self.fold
         )
 
     @property
@@ -286,7 +314,7 @@ class DateTime(datetime.datetime, Date):
     def time(self) -> Time:
         return Time(self.hour, self.minute, self.second, self.microsecond)
 
-    def naive(self) -> DateTime:
+    def naive(self) -> Self:
         """
         Return the DateTime without timezone information.
         """
@@ -300,7 +328,7 @@ class DateTime(datetime.datetime, Date):
             self.microsecond,
         )
 
-    def on(self, year: int, month: int, day: int) -> DateTime:
+    def on(self, year: int, month: int, day: int) -> Self:
         """
         Returns a new instance with the current date set to a different date.
         """
@@ -308,7 +336,7 @@ class DateTime(datetime.datetime, Date):
 
     def at(
         self, hour: int, minute: int = 0, second: int = 0, microsecond: int = 0
-    ) -> DateTime:
+    ) -> Self:
         """
         Returns a new instance with the current time to a different time.
         """
@@ -316,7 +344,7 @@ class DateTime(datetime.datetime, Date):
             hour=hour, minute=minute, second=second, microsecond=microsecond
         )
 
-    def in_timezone(self, tz: str | Timezone | FixedTimezone) -> DateTime:
+    def in_timezone(self, tz: str | Timezone | FixedTimezone) -> Self:
         """
         Set the instance's timezone from a string or object.
         """
@@ -326,9 +354,9 @@ class DateTime(datetime.datetime, Date):
         if not self.timezone:
             dt = dt.replace(fold=1)
 
-        return cast(DateTime, tz.convert(dt))
+        return tz.convert(dt)
 
-    def in_tz(self, tz: str | Timezone | FixedTimezone) -> DateTime:
+    def in_tz(self, tz: str | Timezone | FixedTimezone) -> Self:
         """
         Set the instance's timezone from a string or object.
         """
@@ -439,7 +467,7 @@ class DateTime(datetime.datetime, Date):
         return self.format(fmt_value, locale=locale)
 
     def __str__(self) -> str:
-        return self.isoformat("T")
+        return self.isoformat(" ")
 
     def __repr__(self) -> str:
         us = ""
@@ -466,19 +494,19 @@ class DateTime(datetime.datetime, Date):
         )
 
     # Comparisons
-    def closest(self, *dts: datetime.datetime) -> DateTime:  # type: ignore[override]
+    def closest(self, *dts: datetime.datetime) -> Self:  # type: ignore[override]
         """
-        Get the farthest date from the instance.
+        Get the closest date to the instance.
         """
-        pdts = [pendulum.instance(x) for x in dts]
+        pdts = [self.instance(x) for x in dts]
 
         return min((abs(self - dt), dt) for dt in pdts)[1]
 
-    def farthest(self, *dts: datetime.datetime) -> DateTime:  # type: ignore[override]
+    def farthest(self, *dts: datetime.datetime) -> Self:  # type: ignore[override]
         """
         Get the farthest date from the instance.
         """
-        pdts = [pendulum.instance(x) for x in dts]
+        pdts = [self.instance(x) for x in dts]
 
         return max((abs(self - dt), dt) for dt in pdts)[1]
 
@@ -510,7 +538,7 @@ class DateTime(datetime.datetime, Date):
         Checks if the passed in date is the same day
         as the instance current day.
         """
-        dt = pendulum.instance(dt)
+        dt = self.instance(dt)
 
         return self.to_date_string() == dt.to_date_string()
 
@@ -524,7 +552,7 @@ class DateTime(datetime.datetime, Date):
         if dt is None:
             dt = self.now(self.tz)
 
-        instance = pendulum.instance(dt)
+        instance = self.instance(dt)
 
         return (self.month, self.day) == (instance.month, instance.day)
 
@@ -540,7 +568,7 @@ class DateTime(datetime.datetime, Date):
         minutes: int = 0,
         seconds: float = 0,
         microseconds: int = 0,
-    ) -> DateTime:
+    ) -> Self:
         """
         Add a duration to the instance.
 
@@ -577,7 +605,7 @@ class DateTime(datetime.datetime, Date):
         )
 
         if units_of_variable_length or self.tz is None:
-            return DateTime.create(
+            return self.__class__.create(
                 dt.year,
                 dt.month,
                 dt.day,
@@ -623,7 +651,7 @@ class DateTime(datetime.datetime, Date):
         minutes: int = 0,
         seconds: float = 0,
         microseconds: int = 0,
-    ) -> DateTime:
+    ) -> Self:
         """
         Remove duration from the instance.
         """
@@ -641,7 +669,7 @@ class DateTime(datetime.datetime, Date):
     # Adding a final underscore to the method name
     # to avoid errors for PyPy which already defines
     # a _add_timedelta method
-    def _add_timedelta_(self, delta: datetime.timedelta) -> DateTime:
+    def _add_timedelta_(self, delta: datetime.timedelta) -> Self:
         """
         Add timedelta duration to the instance.
         """
@@ -657,13 +685,11 @@ class DateTime(datetime.datetime, Date):
                 microseconds=delta.microseconds,
             )
         elif isinstance(delta, pendulum.Duration):
-            return self.add(
-                years=delta.years, months=delta.months, seconds=delta._total
-            )
+            return self.add(**delta._signature)  # type: ignore[attr-defined]
 
         return self.add(seconds=delta.total_seconds())
 
-    def _subtract_timedelta(self, delta: datetime.timedelta) -> DateTime:
+    def _subtract_timedelta(self, delta: datetime.timedelta) -> Self:
         """
         Remove timedelta duration from the instance.
         """
@@ -722,7 +748,7 @@ class DateTime(datetime.datetime, Date):
         return pendulum.format_diff(diff, is_now, absolute, locale)
 
     # Modifiers
-    def start_of(self, unit: str) -> DateTime:
+    def start_of(self, unit: str) -> Self:
         """
         Returns a copy of the instance with the time reset
         with the following rules:
@@ -740,9 +766,9 @@ class DateTime(datetime.datetime, Date):
         if unit not in self._MODIFIERS_VALID_UNITS:
             raise ValueError(f'Invalid unit "{unit}" for start_of()')
 
-        return cast(DateTime, getattr(self, f"_start_of_{unit}")())
+        return cast("Self", getattr(self, f"_start_of_{unit}")())
 
-    def end_of(self, unit: str) -> DateTime:
+    def end_of(self, unit: str) -> Self:
         """
         Returns a copy of the instance with the time reset
         with the following rules:
@@ -760,83 +786,83 @@ class DateTime(datetime.datetime, Date):
         if unit not in self._MODIFIERS_VALID_UNITS:
             raise ValueError(f'Invalid unit "{unit}" for end_of()')
 
-        return cast(DateTime, getattr(self, f"_end_of_{unit}")())
+        return cast("Self", getattr(self, f"_end_of_{unit}")())
 
-    def _start_of_second(self) -> DateTime:
+    def _start_of_second(self) -> Self:
         """
         Reset microseconds to 0.
         """
         return self.set(microsecond=0)
 
-    def _end_of_second(self) -> DateTime:
+    def _end_of_second(self) -> Self:
         """
         Set microseconds to 999999.
         """
         return self.set(microsecond=999999)
 
-    def _start_of_minute(self) -> DateTime:
+    def _start_of_minute(self) -> Self:
         """
         Reset seconds and microseconds to 0.
         """
         return self.set(second=0, microsecond=0)
 
-    def _end_of_minute(self) -> DateTime:
+    def _end_of_minute(self) -> Self:
         """
         Set seconds to 59 and microseconds to 999999.
         """
         return self.set(second=59, microsecond=999999)
 
-    def _start_of_hour(self) -> DateTime:
+    def _start_of_hour(self) -> Self:
         """
         Reset minutes, seconds and microseconds to 0.
         """
         return self.set(minute=0, second=0, microsecond=0)
 
-    def _end_of_hour(self) -> DateTime:
+    def _end_of_hour(self) -> Self:
         """
         Set minutes and seconds to 59 and microseconds to 999999.
         """
         return self.set(minute=59, second=59, microsecond=999999)
 
-    def _start_of_day(self) -> DateTime:
+    def _start_of_day(self) -> Self:
         """
         Reset the time to 00:00:00.
         """
         return self.at(0, 0, 0, 0)
 
-    def _end_of_day(self) -> DateTime:
+    def _end_of_day(self) -> Self:
         """
         Reset the time to 23:59:59.999999.
         """
         return self.at(23, 59, 59, 999999)
 
-    def _start_of_month(self) -> DateTime:
+    def _start_of_month(self) -> Self:
         """
         Reset the date to the first day of the month and the time to 00:00:00.
         """
         return self.set(self.year, self.month, 1, 0, 0, 0, 0)
 
-    def _end_of_month(self) -> DateTime:
+    def _end_of_month(self) -> Self:
         """
         Reset the date to the last day of the month
         and the time to 23:59:59.999999.
         """
         return self.set(self.year, self.month, self.days_in_month, 23, 59, 59, 999999)
 
-    def _start_of_year(self) -> DateTime:
+    def _start_of_year(self) -> Self:
         """
         Reset the date to the first day of the year and the time to 00:00:00.
         """
         return self.set(self.year, 1, 1, 0, 0, 0, 0)
 
-    def _end_of_year(self) -> DateTime:
+    def _end_of_year(self) -> Self:
         """
         Reset the date to the last day of the year
         and the time to 23:59:59.999999.
         """
         return self.set(self.year, 12, 31, 23, 59, 59, 999999)
 
-    def _start_of_decade(self) -> DateTime:
+    def _start_of_decade(self) -> Self:
         """
         Reset the date to the first day of the decade
         and the time to 00:00:00.
@@ -844,7 +870,7 @@ class DateTime(datetime.datetime, Date):
         year = self.year - self.year % YEARS_PER_DECADE
         return self.set(year, 1, 1, 0, 0, 0, 0)
 
-    def _end_of_decade(self) -> DateTime:
+    def _end_of_decade(self) -> Self:
         """
         Reset the date to the last day of the decade
         and the time to 23:59:59.999999.
@@ -853,7 +879,7 @@ class DateTime(datetime.datetime, Date):
 
         return self.set(year, 12, 31, 23, 59, 59, 999999)
 
-    def _start_of_century(self) -> DateTime:
+    def _start_of_century(self) -> Self:
         """
         Reset the date to the first day of the century
         and the time to 00:00:00.
@@ -862,7 +888,7 @@ class DateTime(datetime.datetime, Date):
 
         return self.set(year, 1, 1, 0, 0, 0, 0)
 
-    def _end_of_century(self) -> DateTime:
+    def _end_of_century(self) -> Self:
         """
         Reset the date to the last day of the century
         and the time to 23:59:59.999999.
@@ -871,7 +897,7 @@ class DateTime(datetime.datetime, Date):
 
         return self.set(year, 12, 31, 23, 59, 59, 999999)
 
-    def _start_of_week(self) -> DateTime:
+    def _start_of_week(self) -> Self:
         """
         Reset the date to the first day of the week
         and the time to 00:00:00.
@@ -883,7 +909,7 @@ class DateTime(datetime.datetime, Date):
 
         return dt.start_of("day")
 
-    def _end_of_week(self) -> DateTime:
+    def _end_of_week(self) -> Self:
         """
         Reset the date to the last day of the week
         and the time to 23:59:59.
@@ -895,7 +921,7 @@ class DateTime(datetime.datetime, Date):
 
         return dt.end_of("day")
 
-    def next(self, day_of_week: int | None = None, keep_time: bool = False) -> DateTime:
+    def next(self, day_of_week: WeekDay | None = None, keep_time: bool = False) -> Self:
         """
         Modify to the next occurrence of a given day of the week.
         If no day_of_week is provided, modify to the next occurrence
@@ -905,13 +931,10 @@ class DateTime(datetime.datetime, Date):
         if day_of_week is None:
             day_of_week = self.day_of_week
 
-        if day_of_week < SUNDAY or day_of_week > SATURDAY:
+        if day_of_week < WeekDay.MONDAY or day_of_week > WeekDay.SUNDAY:
             raise ValueError("Invalid day of week")
 
-        if keep_time:
-            dt = self
-        else:
-            dt = self.start_of("day")
+        dt = self if keep_time else self.start_of("day")
 
         dt = dt.add(days=1)
         while dt.day_of_week != day_of_week:
@@ -920,8 +943,8 @@ class DateTime(datetime.datetime, Date):
         return dt
 
     def previous(
-        self, day_of_week: int | None = None, keep_time: bool = False
-    ) -> DateTime:
+        self, day_of_week: WeekDay | None = None, keep_time: bool = False
+    ) -> Self:
         """
         Modify to the previous occurrence of a given day of the week.
         If no day_of_week is provided, modify to the previous occurrence
@@ -931,13 +954,10 @@ class DateTime(datetime.datetime, Date):
         if day_of_week is None:
             day_of_week = self.day_of_week
 
-        if day_of_week < SUNDAY or day_of_week > SATURDAY:
+        if day_of_week < WeekDay.MONDAY or day_of_week > WeekDay.SUNDAY:
             raise ValueError("Invalid day of week")
 
-        if keep_time:
-            dt = self
-        else:
-            dt = self.start_of("day")
+        dt = self if keep_time else self.start_of("day")
 
         dt = dt.subtract(days=1)
         while dt.day_of_week != day_of_week:
@@ -945,35 +965,37 @@ class DateTime(datetime.datetime, Date):
 
         return dt
 
-    def first_of(self, unit: str, day_of_week: int | None = None) -> DateTime:
+    def first_of(self, unit: str, day_of_week: WeekDay | None = None) -> Self:
         """
         Returns an instance set to the first occurrence
         of a given day of the week in the current unit.
         If no day_of_week is provided, modify to the first day of the unit.
-        Use the supplied consts to indicate the desired day_of_week, ex. DateTime.MONDAY.
+        Use the supplied consts to indicate the desired day_of_week,
+        ex. DateTime.MONDAY.
 
         Supported units are month, quarter and year.
         """
         if unit not in ["month", "quarter", "year"]:
             raise ValueError(f'Invalid unit "{unit}" for first_of()')
 
-        return cast(DateTime, getattr(self, f"_first_of_{unit}")(day_of_week))
+        return cast("Self", getattr(self, f"_first_of_{unit}")(day_of_week))
 
-    def last_of(self, unit: str, day_of_week: int | None = None) -> DateTime:
+    def last_of(self, unit: str, day_of_week: WeekDay | None = None) -> Self:
         """
         Returns an instance set to the last occurrence
         of a given day of the week in the current unit.
         If no day_of_week is provided, modify to the last day of the unit.
-        Use the supplied consts to indicate the desired day_of_week, ex. DateTime.MONDAY.
+        Use the supplied consts to indicate the desired day_of_week,
+        ex. DateTime.MONDAY.
 
         Supported units are month, quarter and year.
         """
         if unit not in ["month", "quarter", "year"]:
             raise ValueError(f'Invalid unit "{unit}" for first_of()')
 
-        return cast(DateTime, getattr(self, f"_last_of_{unit}")(day_of_week))
+        return cast("Self", getattr(self, f"_last_of_{unit}")(day_of_week))
 
-    def nth_of(self, unit: str, nth: int, day_of_week: int) -> DateTime:
+    def nth_of(self, unit: str, nth: int, day_of_week: WeekDay) -> Self:
         """
         Returns a new instance set to the given occurrence
         of a given day of the week in the current unit.
@@ -986,18 +1008,16 @@ class DateTime(datetime.datetime, Date):
         if unit not in ["month", "quarter", "year"]:
             raise ValueError(f'Invalid unit "{unit}" for first_of()')
 
-        dt = cast(
-            Optional[DateTime], getattr(self, f"_nth_of_{unit}")(nth, day_of_week)
-        )
+        dt = cast(Optional["Self"], getattr(self, f"_nth_of_{unit}")(nth, day_of_week))
         if not dt:
             raise PendulumException(
-                f"Unable to find occurence {nth}"
-                f" of {self._days[day_of_week]} in {unit}"
+                f"Unable to find occurrence {nth}"
+                f" of {WeekDay(day_of_week).name.capitalize()} in {unit}"
             )
 
         return dt
 
-    def _first_of_month(self, day_of_week: int | None = None) -> DateTime:
+    def _first_of_month(self, day_of_week: WeekDay | None = None) -> Self:
         """
         Modify to the first occurrence of a given day of the week
         in the current month. If no day_of_week is provided,
@@ -1011,7 +1031,7 @@ class DateTime(datetime.datetime, Date):
 
         month = calendar.monthcalendar(dt.year, dt.month)
 
-        calendar_day = (day_of_week - 1) % 7
+        calendar_day = day_of_week
 
         if month[0][calendar_day] > 0:
             day_of_month = month[0][calendar_day]
@@ -1020,7 +1040,7 @@ class DateTime(datetime.datetime, Date):
 
         return dt.set(day=day_of_month)
 
-    def _last_of_month(self, day_of_week: int | None = None) -> DateTime:
+    def _last_of_month(self, day_of_week: WeekDay | None = None) -> Self:
         """
         Modify to the last occurrence of a given day of the week
         in the current month. If no day_of_week is provided,
@@ -1034,7 +1054,7 @@ class DateTime(datetime.datetime, Date):
 
         month = calendar.monthcalendar(dt.year, dt.month)
 
-        calendar_day = (day_of_week - 1) % 7
+        calendar_day = day_of_week
 
         if month[-1][calendar_day] > 0:
             day_of_month = month[-1][calendar_day]
@@ -1044,8 +1064,8 @@ class DateTime(datetime.datetime, Date):
         return dt.set(day=day_of_month)
 
     def _nth_of_month(
-        self, nth: int, day_of_week: int | None = None
-    ) -> DateTime | None:
+        self, nth: int, day_of_week: WeekDay | None = None
+    ) -> Self | None:
         """
         Modify to the given occurrence of a given day of the week
         in the current month. If the calculated occurrence is outside,
@@ -1066,7 +1086,7 @@ class DateTime(datetime.datetime, Date):
 
         return None
 
-    def _first_of_quarter(self, day_of_week: int | None = None) -> DateTime:
+    def _first_of_quarter(self, day_of_week: WeekDay | None = None) -> Self:
         """
         Modify to the first occurrence of a given day of the week
         in the current quarter. If no day_of_week is provided,
@@ -1077,7 +1097,7 @@ class DateTime(datetime.datetime, Date):
             "month", day_of_week
         )
 
-    def _last_of_quarter(self, day_of_week: int | None = None) -> DateTime:
+    def _last_of_quarter(self, day_of_week: WeekDay | None = None) -> Self:
         """
         Modify to the last occurrence of a given day of the week
         in the current quarter. If no day_of_week is provided,
@@ -1087,8 +1107,8 @@ class DateTime(datetime.datetime, Date):
         return self.on(self.year, self.quarter * 3, 1).last_of("month", day_of_week)
 
     def _nth_of_quarter(
-        self, nth: int, day_of_week: int | None = None
-    ) -> DateTime | None:
+        self, nth: int, day_of_week: WeekDay | None = None
+    ) -> Self | None:
         """
         Modify to the given occurrence of a given day of the week
         in the current quarter. If the calculated occurrence is outside,
@@ -1111,7 +1131,7 @@ class DateTime(datetime.datetime, Date):
 
         return self.on(self.year, dt.month, dt.day).start_of("day")
 
-    def _first_of_year(self, day_of_week: int | None = None) -> DateTime:
+    def _first_of_year(self, day_of_week: WeekDay | None = None) -> Self:
         """
         Modify to the first occurrence of a given day of the week
         in the current year. If no day_of_week is provided,
@@ -1120,7 +1140,7 @@ class DateTime(datetime.datetime, Date):
         """
         return self.set(month=1).first_of("month", day_of_week)
 
-    def _last_of_year(self, day_of_week: int | None = None) -> DateTime:
+    def _last_of_year(self, day_of_week: WeekDay | None = None) -> Self:
         """
         Modify to the last occurrence of a given day of the week
         in the current year. If no day_of_week is provided,
@@ -1129,7 +1149,7 @@ class DateTime(datetime.datetime, Date):
         """
         return self.set(month=MONTHS_PER_YEAR).last_of("month", day_of_week)
 
-    def _nth_of_year(self, nth: int, day_of_week: int | None = None) -> DateTime | None:
+    def _nth_of_year(self, nth: int, day_of_week: WeekDay | None = None) -> Self | None:
         """
         Modify to the given occurrence of a given day of the week
         in the current year. If the calculated occurrence is outside,
@@ -1152,7 +1172,7 @@ class DateTime(datetime.datetime, Date):
 
     def average(  # type: ignore[override]
         self, dt: datetime.datetime | None = None
-    ) -> DateTime:
+    ) -> Self:
         """
         Modify the current instance to the average
         of a given instance (default now) and the current instance.
@@ -1166,16 +1186,14 @@ class DateTime(datetime.datetime, Date):
         )
 
     @overload  # type: ignore[override]
-    def __sub__(self, other: datetime.timedelta) -> DateTime:
+    def __sub__(self, other: datetime.timedelta) -> Self:
         ...
 
     @overload
     def __sub__(self, other: DateTime) -> Interval:
         ...
 
-    def __sub__(
-        self, other: datetime.datetime | datetime.timedelta
-    ) -> DateTime | Interval:
+    def __sub__(self, other: datetime.datetime | datetime.timedelta) -> Self | Interval:
         if isinstance(other, datetime.timedelta):
             return self._subtract_timedelta(other)
 
@@ -1194,7 +1212,7 @@ class DateTime(datetime.datetime, Date):
                     other.microsecond,
                 )
             else:
-                other = pendulum.instance(other)
+                other = self.instance(other)
 
         return other.diff(self, False)
 
@@ -1214,46 +1232,38 @@ class DateTime(datetime.datetime, Date):
                     other.microsecond,
                 )
             else:
-                other = pendulum.instance(other)
+                other = self.instance(other)
 
         return self.diff(other, False)
 
-    def __add__(self, other: datetime.timedelta) -> DateTime:
+    def __add__(self, other: datetime.timedelta) -> Self:
         if not isinstance(other, datetime.timedelta):
             return NotImplemented
 
-        if PY38:
-            # This is a workaround for Python 3.8+
-            # since calling astimezone() will call this method
-            # instead of the base datetime class one.
-            import inspect
-
-            caller = inspect.stack()[1][3]
-            if caller == "astimezone":
-                return cast(DateTime, super().__add__(other))
+        caller = traceback.extract_stack(limit=2)[0].name
+        if caller == "astimezone":
+            return super().__add__(other)
 
         return self._add_timedelta_(other)
 
-    def __radd__(self, other: datetime.timedelta) -> DateTime:
+    def __radd__(self, other: datetime.timedelta) -> Self:
         return self.__add__(other)
 
     # Native methods override
 
     @classmethod
-    def fromtimestamp(cls, t: float, tz: datetime.tzinfo | None = None) -> DateTime:
+    def fromtimestamp(cls, t: float, tz: datetime.tzinfo | None = None) -> Self:
         tzinfo = pendulum._safe_timezone(tz)
 
-        return pendulum.instance(
-            datetime.datetime.fromtimestamp(t, tz=tzinfo), tz=tzinfo
-        )
+        return cls.instance(datetime.datetime.fromtimestamp(t, tz=tzinfo), tz=tzinfo)
 
     @classmethod
-    def utcfromtimestamp(cls, t: float) -> DateTime:
-        return pendulum.instance(datetime.datetime.utcfromtimestamp(t), tz=None)
+    def utcfromtimestamp(cls, t: float) -> Self:
+        return cls.instance(datetime.datetime.utcfromtimestamp(t), tz=None)
 
     @classmethod
-    def fromordinal(cls, n: int) -> DateTime:
-        return pendulum.instance(datetime.datetime.fromordinal(n), tz=None)
+    def fromordinal(cls, n: int) -> Self:
+        return cls.instance(datetime.datetime.fromordinal(n), tz=None)
 
     @classmethod
     def combine(
@@ -1261,10 +1271,10 @@ class DateTime(datetime.datetime, Date):
         date: datetime.date,
         time: datetime.time,
         tzinfo: datetime.tzinfo | None = None,
-    ) -> DateTime:
-        return pendulum.instance(datetime.datetime.combine(date, time), tz=tzinfo)
+    ) -> Self:
+        return cls.instance(datetime.datetime.combine(date, time), tz=tzinfo)
 
-    def astimezone(self, tz: datetime.tzinfo | None = None) -> DateTime:
+    def astimezone(self, tz: datetime.tzinfo | None = None) -> Self:
         dt = super().astimezone(tz)
 
         return self.__class__(
@@ -1281,16 +1291,16 @@ class DateTime(datetime.datetime, Date):
 
     def replace(
         self,
-        year: int | None = None,
-        month: int | None = None,
-        day: int | None = None,
-        hour: int | None = None,
-        minute: int | None = None,
-        second: int | None = None,
-        microsecond: int | None = None,
+        year: SupportsIndex | None = None,
+        month: SupportsIndex | None = None,
+        day: SupportsIndex | None = None,
+        hour: SupportsIndex | None = None,
+        minute: SupportsIndex | None = None,
+        second: SupportsIndex | None = None,
+        microsecond: SupportsIndex | None = None,
         tzinfo: bool | datetime.tzinfo | Literal[True] | None = True,
         fold: int | None = None,
-    ) -> DateTime:
+    ) -> Self:
         if year is None:
             year = self.year
         if month is None:
@@ -1313,7 +1323,7 @@ class DateTime(datetime.datetime, Date):
         if tzinfo is not None:
             tzinfo = pendulum._safe_timezone(tzinfo)
 
-        return DateTime.create(
+        return self.__class__.create(
             year,
             month,
             day,
@@ -1325,11 +1335,11 @@ class DateTime(datetime.datetime, Date):
             fold=fold,
         )
 
-    def __getnewargs__(self) -> tuple[DateTime]:
+    def __getnewargs__(self) -> tuple[Self]:
         return (self,)
 
     def _getstate(
-        self, protocol: int = 3
+        self, protocol: SupportsIndex = 3
     ) -> tuple[int, int, int, int, int, int, int, datetime.tzinfo | None]:
         return (
             self.year,
@@ -1345,17 +1355,32 @@ class DateTime(datetime.datetime, Date):
     def __reduce__(
         self,
     ) -> tuple[
-        type[DateTime], tuple[int, int, int, int, int, int, int, datetime.tzinfo | None]
+        type[Self],
+        tuple[int, int, int, int, int, int, int, datetime.tzinfo | None],
     ]:
         return self.__reduce_ex__(2)
 
-    def __reduce_ex__(  # type: ignore[override]
-        self, protocol: int
+    def __reduce_ex__(
+        self, protocol: SupportsIndex
     ) -> tuple[
-        type[DateTime], tuple[int, int, int, int, int, int, int, datetime.tzinfo | None]
+        type[Self],
+        tuple[int, int, int, int, int, int, int, datetime.tzinfo | None],
     ]:
         return self.__class__, self._getstate(protocol)
 
+    def __deepcopy__(self, _: dict[int, Self]) -> Self:
+        return self.__class__(
+            self.year,
+            self.month,
+            self.day,
+            self.hour,
+            self.minute,
+            self.second,
+            self.microsecond,
+            tzinfo=self.tz,
+            fold=self.fold,
+        )
+
     def _cmp(self, other: datetime.datetime, **kwargs: Any) -> int:
         # Fix for pypy which compares using this method
         # which would lead to infinite recursion if we didn't override
@@ -1374,8 +1399,6 @@ class DateTime(datetime.datetime, Date):
         return 0 if dt == other else 1 if dt > other else -1
 
 
-DateTime.min: DateTime = DateTime(1, 1, 1, 0, 0, tzinfo=UTC)  # type: ignore[misc]
-DateTime.max: DateTime = DateTime(  # type: ignore[misc]
-    9999, 12, 31, 23, 59, 59, 999999, tzinfo=UTC
-)
-DateTime.EPOCH: DateTime = DateTime(1970, 1, 1, tzinfo=UTC)  # type: ignore[misc]
+DateTime.min = DateTime(1, 1, 1, 0, 0, tzinfo=UTC)
+DateTime.max = DateTime(9999, 12, 31, 23, 59, 59, 999999, tzinfo=UTC)
+DateTime.EPOCH = DateTime(1970, 1, 1, tzinfo=UTC)
diff --git a/src/pendulum/day.py b/src/pendulum/day.py
new file mode 100644
index 0000000..7bfffca
--- /dev/null
+++ b/src/pendulum/day.py
@@ -0,0 +1,13 @@
+from __future__ import annotations
+
+from enum import IntEnum
+
+
+class WeekDay(IntEnum):
+    MONDAY = 0
+    TUESDAY = 1
+    WEDNESDAY = 2
+    THURSDAY = 3
+    FRIDAY = 4
+    SATURDAY = 5
+    SUNDAY = 6
diff --git a/pendulum/duration.py b/src/pendulum/duration.py
index a3a68b1..a4875fc 100644
--- a/pendulum/duration.py
+++ b/src/pendulum/duration.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from datetime import timedelta
+from typing import TYPE_CHECKING
 from typing import cast
 from typing import overload
 
@@ -13,6 +14,10 @@ from pendulum.constants import US_PER_SECOND
 from pendulum.utils._compat import PYPY
 
 
+if TYPE_CHECKING:
+    from typing_extensions import Self
+
+
 def _divide_and_round(a: float, b: float) -> int:
     """divide a by b and round result to the nearest integer
 
@@ -74,7 +79,7 @@ class Duration(timedelta):
         weeks: float = 0,
         years: float = 0,
         months: float = 0,
-    ) -> Duration:
+    ) -> Self:
         if not isinstance(years, int) or not isinstance(months, int):
             raise ValueError("Float year and months are not supported")
 
@@ -107,6 +112,17 @@ class Duration(timedelta):
         self._months = months
         self._years = years
 
+        self._signature = {  # type: ignore[attr-defined]
+            "years": years,
+            "months": months,
+            "weeks": weeks,
+            "days": days,
+            "hours": hours,
+            "minutes": minutes,
+            "seconds": seconds,
+            "microseconds": microseconds + milliseconds * 1000,
+        }
+
         return self
 
     def total_minutes(self) -> float:
@@ -231,7 +247,7 @@ class Duration(timedelta):
         :param locale: The locale to use. Defaults to current locale.
         :param separator: The separator to use between each unit
         """
-        periods = [
+        intervals = [
             ("year", self.years),
             ("month", self.months),
             ("week", self.weeks),
@@ -247,13 +263,13 @@ class Duration(timedelta):
         loaded_locale = pendulum.locale(locale)
 
         parts = []
-        for period in periods:
-            unit, period_count = period
-            if abs(period_count) > 0:
+        for interval in intervals:
+            unit, interval_count = interval
+            if abs(interval_count) > 0:
                 translation = loaded_locale.translation(
-                    f"units.{unit}.{loaded_locale.plural(abs(period_count))}"
+                    f"units.{unit}.{loaded_locale.plural(abs(interval_count))}"
                 )
-                parts.append(translation.format(period_count))
+                parts.append(translation.format(interval_count))
 
         if not parts:
             count: int | str = 0
@@ -313,7 +329,7 @@ class Duration(timedelta):
 
         return rep.replace(", )", ")")
 
-    def __add__(self, other: timedelta) -> Duration:
+    def __add__(self, other: timedelta) -> Self:
         if isinstance(other, timedelta):
             return self.__class__(seconds=self.total_seconds() + other.total_seconds())
 
@@ -321,13 +337,13 @@ class Duration(timedelta):
 
     __radd__ = __add__
 
-    def __sub__(self, other: timedelta) -> Duration:
+    def __sub__(self, other: timedelta) -> Self:
         if isinstance(other, timedelta):
             return self.__class__(seconds=self.total_seconds() - other.total_seconds())
 
         return NotImplemented
 
-    def __neg__(self) -> Duration:
+    def __neg__(self) -> Self:
         return self.__class__(
             years=-self._years,
             months=-self._months,
@@ -340,7 +356,7 @@ class Duration(timedelta):
     def _to_microseconds(self) -> int:
         return (self._days * (24 * 3600) + self._seconds) * 1000000 + self._microseconds
 
-    def __mul__(self, other: int | float) -> Duration:
+    def __mul__(self, other: int | float) -> Self:
         if isinstance(other, int):
             return self.__class__(
                 years=self._years * other,
@@ -363,7 +379,7 @@ class Duration(timedelta):
         ...
 
     @overload
-    def __floordiv__(self, other: int) -> Duration:
+    def __floordiv__(self, other: int) -> Self:
         ...
 
     def __floordiv__(self, other: int | timedelta) -> int | Duration:
@@ -372,7 +388,9 @@ class Duration(timedelta):
 
         usec = self._to_microseconds()
         if isinstance(other, timedelta):
-            return cast(int, usec // other._to_microseconds())  # type: ignore[attr-defined]
+            return cast(
+                int, usec // other._to_microseconds()  # type: ignore[attr-defined]
+            )
 
         if isinstance(other, int):
             return self.__class__(
@@ -388,16 +406,18 @@ class Duration(timedelta):
         ...
 
     @overload
-    def __truediv__(self, other: float) -> Duration:
+    def __truediv__(self, other: float) -> Self:
         ...
 
-    def __truediv__(self, other: int | float | timedelta) -> Duration | float:
+    def __truediv__(self, other: int | float | timedelta) -> Self | float:
         if not isinstance(other, (int, float, timedelta)):
             return NotImplemented
 
         usec = self._to_microseconds()
         if isinstance(other, timedelta):
-            return cast(float, usec / other._to_microseconds())  # type: ignore[attr-defined]
+            return cast(
+                float, usec / other._to_microseconds()  # type: ignore[attr-defined]
+            )
 
         if isinstance(other, int):
             return self.__class__(
@@ -421,9 +441,9 @@ class Duration(timedelta):
 
     __div__ = __floordiv__
 
-    def __mod__(self, other: timedelta) -> Duration:
+    def __mod__(self, other: timedelta) -> Self:
         if isinstance(other, timedelta):
-            r = self._to_microseconds() % other._to_microseconds()  # type: ignore[attr-defined]
+            r = self._to_microseconds() % other._to_microseconds()  # type: ignore[attr-defined] # noqa: E501
 
             return self.__class__(0, 0, r)
 
@@ -431,12 +451,26 @@ class Duration(timedelta):
 
     def __divmod__(self, other: timedelta) -> tuple[int, Duration]:
         if isinstance(other, timedelta):
-            q, r = divmod(self._to_microseconds(), other._to_microseconds())  # type: ignore[attr-defined]
+            q, r = divmod(
+                self._to_microseconds(),
+                other._to_microseconds(),  # type: ignore[attr-defined]
+            )
 
             return q, self.__class__(0, 0, r)
 
         return NotImplemented
 
+    def __deepcopy__(self, _: dict[int, Self]) -> Self:
+        return self.__class__(
+            days=self.remaining_days,
+            seconds=self.remaining_seconds,
+            microseconds=self.microseconds,
+            minutes=self.minutes,
+            hours=self.hours,
+            years=self.years,
+            months=self.months,
+        )
+
 
 Duration.min = Duration(days=-999999999)
 Duration.max = Duration(
@@ -480,12 +514,9 @@ class AbsoluteDuration(Duration):
         total = abs(self._total)
 
         self._microseconds = round(total % 1 * 1e6)
-        self._seconds = int(total) % SECONDS_PER_DAY
-
-        days = int(total) // SECONDS_PER_DAY
+        days, self._seconds = divmod(int(total), SECONDS_PER_DAY)
         self._days = abs(days + years * 365 + months * 30)
-        self._remaining_days = days % 7
-        self._weeks = days // 7
+        self._weeks, self._remaining_days = divmod(days, 7)
         self._months = abs(months)
         self._years = abs(years)
 
diff --git a/src/pendulum/exceptions.py b/src/pendulum/exceptions.py
new file mode 100644
index 0000000..1687211
--- /dev/null
+++ b/src/pendulum/exceptions.py
@@ -0,0 +1,13 @@
+from __future__ import annotations
+
+from pendulum.parsing.exceptions import ParserError
+
+
+class PendulumException(Exception):
+    pass
+
+
+__all__ = [
+    "ParserError",
+    "PendulumException",
+]
diff --git a/pendulum/formatting/__init__.py b/src/pendulum/formatting/__init__.py
index 975c409..0c6e725 100644
--- a/pendulum/formatting/__init__.py
+++ b/src/pendulum/formatting/__init__.py
@@ -2,4 +2,5 @@ from __future__ import annotations
 
 from pendulum.formatting.formatter import Formatter
 
+
 __all__ = ["Formatter"]
diff --git a/pendulum/formatting/difference_formatter.py b/src/pendulum/formatting/difference_formatter.py
index dad219d..588c072 100644
--- a/pendulum/formatting/difference_formatter.py
+++ b/src/pendulum/formatting/difference_formatter.py
@@ -4,6 +4,7 @@ import typing as t
 
 from pendulum.locales.locale import Locale
 
+
 if t.TYPE_CHECKING:
     from pendulum import Duration
 
@@ -31,10 +32,7 @@ class DifferenceFormatter:
         :param absolute: Whether it's an absolute difference or not
         :param locale: The locale to use
         """
-        if locale is None:
-            locale = self._locale
-        else:
-            locale = Locale.load(locale)
+        locale = self._locale if locale is None else Locale.load(locale)
 
         if diff.years > 0:
             unit = "year"
diff --git a/pendulum/formatting/formatter.py b/src/pendulum/formatting/formatter.py
index f91d5d9..ee04063 100644
--- a/pendulum/formatting/formatter.py
+++ b/src/pendulum/formatting/formatter.py
@@ -6,6 +6,7 @@ import re
 from typing import TYPE_CHECKING
 from typing import Any
 from typing import Callable
+from typing import ClassVar
 from typing import Match
 from typing import Sequence
 from typing import cast
@@ -14,6 +15,7 @@ import pendulum
 
 from pendulum.locales.locale import Locale
 
+
 if TYPE_CHECKING:
     from pendulum import Timezone
 
@@ -47,7 +49,7 @@ class Formatter:
         r"\[([^\[]*)\]|\\(.)|"
         "("
         "Mo|MM?M?M?"
-        "|Do|DDDo|DD?D?D?|ddd?d?|do?"
+        "|Do|DDDo|DD?D?D?|ddd?d?|do?|eo?"
         "|E{1,4}"
         "|w[o|w]?|W[o|W]?|Qo?"
         "|YYYY|YY|Y"
@@ -65,7 +67,9 @@ class Formatter:
 
     _FROM_FORMAT_RE: re.Pattern[str] = re.compile(r"(?<!\\\[)" + _TOKENS + r"(?!\\\])")
 
-    _LOCALIZABLE_TOKENS: dict[str, str | Callable[[Locale], Sequence[str]] | None] = {
+    _LOCALIZABLE_TOKENS: ClassVar[
+        dict[str, str | Callable[[Locale], Sequence[str]] | None]
+    ] = {
         "Qo": None,
         "MMMM": "months.wide",
         "MMM": "months.abbreviated",
@@ -78,6 +82,8 @@ class Formatter:
         "ddd": "days.abbreviated",
         "dd": "days.short",
         "do": None,
+        "e": None,
+        "eo": None,
         "Wo": None,
         "wo": None,
         "A": lambda locale: (
@@ -90,7 +96,7 @@ class Formatter:
         ),
     }
 
-    _TOKENS_RULES: dict[str, Callable[[pendulum.DateTime], str]] = {
+    _TOKENS_RULES: ClassVar[dict[str, Callable[[pendulum.DateTime], str]]] = {
         # Year
         "YYYY": lambda dt: f"{dt.year:d}",
         "YY": lambda dt: f"{dt.year:d}"[2:],
@@ -107,7 +113,7 @@ class Formatter:
         "DDDD": lambda dt: f"{dt.day_of_year:03d}",
         "DDD": lambda dt: f"{dt.day_of_year:d}",
         # Day of Week
-        "d": lambda dt: f"{dt.day_of_week:d}",
+        "d": lambda dt: f"{(dt.day_of_week + 1) % 7:d}",
         # Day of ISO Week
         "E": lambda dt: f"{dt.isoweekday():d}",
         # Hour
@@ -136,7 +142,7 @@ class Formatter:
         "z": lambda dt: f'{dt.timezone_name or ""}',
     }
 
-    _DATE_FORMATS = {
+    _DATE_FORMATS: ClassVar[dict[str, str]] = {
         "LTS": "formats.time.full",
         "LT": "formats.time.short",
         "L": "formats.date.short",
@@ -145,7 +151,7 @@ class Formatter:
         "LLLL": "formats.datetime.full",
     }
 
-    _DEFAULT_DATE_FORMATS = {
+    _DEFAULT_DATE_FORMATS: ClassVar[dict[str, str]] = {
         "LTS": "h:mm:ss A",
         "LT": "h:mm A",
         "L": "MM/DD/YYYY",
@@ -154,7 +160,7 @@ class Formatter:
         "LLLL": "dddd, MMMM D, YYYY h:mm A",
     }
 
-    _REGEX_TOKENS: dict[str, str | Sequence[str] | None] = {
+    _REGEX_TOKENS: ClassVar[dict[str, str | Sequence[str] | None]] = {
         "Y": _MATCH_SIGNED,
         "YY": (_MATCH_1_TO_2, _MATCH_2),
         "YYYY": (_MATCH_1_TO_4, _MATCH_4),
@@ -172,6 +178,7 @@ class Formatter:
         "ddd": _MATCH_WORD,
         "dd": _MATCH_WORD,
         "d": _MATCH_1,
+        "e": _MATCH_1,
         "E": _MATCH_1,
         "Do": None,
         "H": _MATCH_1_TO_2,
@@ -195,7 +202,7 @@ class Formatter:
         "z": _MATCH_TIMEZONE,
     }
 
-    _PARSE_TOKENS: dict[str, Callable[[str], Any]] = {
+    _PARSE_TOKENS: ClassVar[dict[str, Callable[[str], Any]]] = {
         "YYYY": lambda year: int(year),
         "YY": lambda year: int(year),
         "Q": lambda quarter: int(quarter),
@@ -210,8 +217,8 @@ class Formatter:
         "dddd": lambda weekday: weekday,
         "ddd": lambda weekday: weekday,
         "dd": lambda weekday: weekday,
-        "d": lambda weekday: int(weekday) % 7,
-        "E": lambda weekday: int(weekday),
+        "d": lambda weekday: int(weekday),
+        "E": lambda weekday: int(weekday) - 1,
         "HH": lambda hour: int(hour),
         "H": lambda hour: int(hour),
         "hh": lambda hour: int(hour),
@@ -287,10 +294,7 @@ class Formatter:
             offset = dt.utcoffset() or datetime.timedelta()
             minutes = offset.total_seconds() / 60
 
-            if minutes >= 0:
-                sign = "+"
-            else:
-                sign = "-"
+            sign = "+" if minutes >= 0 else "-"
 
             hour, minute = divmod(abs(int(minutes)), 60)
 
@@ -317,14 +321,19 @@ class Formatter:
             return cast(str, locale.get("translations.days.short")[dt.day_of_week])
         elif token == "ddd":
             return cast(
-                str, locale.get("translations.days.abbreviated")[dt.day_of_week]
+                str,
+                locale.get("translations.days.abbreviated")[dt.day_of_week],
             )
         elif token == "dddd":
             return cast(str, locale.get("translations.days.wide")[dt.day_of_week])
+        elif token == "e":
+            first_day = cast(int, locale.get("translations.week_data.first_day"))
+
+            return str((dt.day_of_week % 7 - first_day) % 7)
         elif token == "Do":
             return locale.ordinalize(dt.day)
         elif token == "do":
-            return locale.ordinalize(dt.day_of_week)
+            return locale.ordinalize((dt.day_of_week + 1) % 7)
         elif token == "Mo":
             return locale.ordinalize(dt.month)
         elif token == "Qo":
@@ -333,6 +342,10 @@ class Formatter:
             return locale.ordinalize(dt.week_of_year)
         elif token == "DDDo":
             return locale.ordinalize(dt.day_of_year)
+        elif token == "eo":
+            first_day = cast(int, locale.get("translations.week_data.first_day"))
+
+            return locale.ordinalize((dt.day_of_week % 7 - first_day) % 7 + 1)
         elif token == "A":
             key = "translations.day_periods"
             if dt.hour >= 12:
@@ -395,9 +408,8 @@ class Formatter:
         if not re.search("^" + pattern + "$", time):
             raise ValueError(f"String does not match format {fmt}")
 
-        _get_parsed_values: Callable[
-            [Match[str]], Any
-        ] = lambda m: self._get_parsed_values(m, parsed, loaded_locale, now)
+        def _get_parsed_values(m: Match[str]) -> Any:
+            return self._get_parsed_values(m, parsed, loaded_locale, now)
 
         re.sub(pattern, _get_parsed_values, time)
 
@@ -448,7 +460,7 @@ class Formatter:
 
         if parsed["quarter"] is not None:
             if validated["year"] is not None:
-                dt = pendulum.datetime(validated["year"], 1, 1)
+                dt = pendulum.datetime(cast(int, validated["year"]), 1, 1)
             else:
                 dt = now
 
@@ -476,8 +488,8 @@ class Formatter:
         if parsed["day_of_week"] is not None:
             dt = pendulum.datetime(
                 cast(int, validated["year"]),
-                validated["month"] or now.month,
-                validated["day"] or now.day,
+                cast(int, validated["month"]) or now.month,
+                cast(int, validated["day"]) or now.day,
             )
             dt = dt.start_of("week").subtract(days=1)
             dt = dt.next(parsed["day_of_week"])
@@ -502,9 +514,9 @@ class Formatter:
                 raise ValueError("Invalid date")
 
             pm = parsed["meridiem"] == "pm"
-            validated["hour"] %= 12
+            validated["hour"] %= 12  # type: ignore[operator]
             if pm:
-                validated["hour"] += 12
+                validated["hour"] += 12  # type: ignore[operator]
 
         if validated["month"] is None:
             if parsed["year"] is not None:
@@ -550,7 +562,10 @@ class Formatter:
 
         if "Y" in token:
             if token == "YY":
-                parsed_token = now.year // 100 * 100 + parsed_token
+                if parsed_token <= 68:
+                    parsed_token += 2000
+                else:
+                    parsed_token += 1900
 
             parsed["year"] = parsed_token
         elif token == "Q":
diff --git a/pendulum/helpers.py b/src/pendulum/helpers.py
index 13b7f22..5d5fe8e 100644
--- a/pendulum/helpers.py
+++ b/src/pendulum/helpers.py
@@ -14,9 +14,11 @@ from typing import overload
 import pendulum
 
 from pendulum.constants import DAYS_PER_MONTHS
+from pendulum.day import WeekDay
 from pendulum.formatting.difference_formatter import DifferenceFormatter
 from pendulum.locales.locale import Locale
 
+
 if TYPE_CHECKING:
     # Prevent import cycles
     from pendulum.duration import Duration
@@ -27,34 +29,31 @@ _DT = TypeVar("_DT", bound=datetime)
 _D = TypeVar("_D", bound=date)
 
 try:
-    # nopycln: file # noqa: E800
     if not with_extensions or struct.calcsize("P") == 4:
         raise ImportError()
 
-    from pendulum._extensions._helpers import PreciseDiff
-    from pendulum._extensions._helpers import days_in_year
-    from pendulum._extensions._helpers import is_leap
-    from pendulum._extensions._helpers import is_long_year
-    from pendulum._extensions._helpers import local_time
-    from pendulum._extensions._helpers import precise_diff
-    from pendulum._extensions._helpers import timestamp
-    from pendulum._extensions._helpers import week_day
+    from pendulum._pendulum import PreciseDiff
+    from pendulum._pendulum import days_in_year
+    from pendulum._pendulum import is_leap
+    from pendulum._pendulum import is_long_year
+    from pendulum._pendulum import local_time
+    from pendulum._pendulum import precise_diff
+    from pendulum._pendulum import week_day
 except ImportError:
-    from pendulum._extensions.helpers import PreciseDiff  # type: ignore[misc]
-    from pendulum._extensions.helpers import days_in_year
-    from pendulum._extensions.helpers import is_leap
-    from pendulum._extensions.helpers import is_long_year
-    from pendulum._extensions.helpers import local_time
-    from pendulum._extensions.helpers import precise_diff  # type: ignore[misc]
-    from pendulum._extensions.helpers import timestamp
-    from pendulum._extensions.helpers import week_day
+    from pendulum._helpers import PreciseDiff  # type: ignore[assignment]
+    from pendulum._helpers import days_in_year
+    from pendulum._helpers import is_leap
+    from pendulum._helpers import is_long_year
+    from pendulum._helpers import local_time
+    from pendulum._helpers import precise_diff  # type: ignore[assignment]
+    from pendulum._helpers import week_day
 
 difference_formatter = DifferenceFormatter()
 
 
 @overload
 def add_duration(
-    dt: datetime,
+    dt: _DT,
     years: int = 0,
     months: int = 0,
     weeks: int = 0,
@@ -63,18 +62,18 @@ def add_duration(
     minutes: int = 0,
     seconds: float = 0,
     microseconds: int = 0,
-) -> datetime:
+) -> _DT:
     ...
 
 
 @overload
 def add_duration(
-    dt: date,
+    dt: _D,
     years: int = 0,
     months: int = 0,
     weeks: int = 0,
     days: int = 0,
-) -> date:
+) -> _D:
     pass
 
 
@@ -190,16 +189,16 @@ def get_locale() -> str:
     return pendulum._LOCALE
 
 
-def week_starts_at(wday: int) -> None:
-    if wday < pendulum.SUNDAY or wday > pendulum.SATURDAY:
-        raise ValueError("Invalid week day as start of week.")
+def week_starts_at(wday: WeekDay) -> None:
+    if wday < WeekDay.MONDAY or wday > WeekDay.SUNDAY:
+        raise ValueError("Invalid day of week")
 
     pendulum._WEEK_STARTS_AT = wday
 
 
-def week_ends_at(wday: int) -> None:
-    if wday < pendulum.SUNDAY or wday > pendulum.SATURDAY:
-        raise ValueError("Invalid week day as start of week.")
+def week_ends_at(wday: WeekDay) -> None:
+    if wday < WeekDay.MONDAY or wday > WeekDay.SUNDAY:
+        raise ValueError("Invalid day of week")
 
     pendulum._WEEK_ENDS_AT = wday
 
@@ -211,7 +210,6 @@ __all__ = [
     "is_long_year",
     "local_time",
     "precise_diff",
-    "timestamp",
     "week_day",
     "add_duration",
     "format_diff",
diff --git a/pendulum/interval.py b/src/pendulum/interval.py
index f20042b..19c91a6 100644
--- a/pendulum/interval.py
+++ b/src/pendulum/interval.py
@@ -17,16 +17,18 @@ from pendulum.constants import MONTHS_PER_YEAR
 from pendulum.duration import Duration
 from pendulum.helpers import precise_diff
 
+
 if TYPE_CHECKING:
-    from typing import SupportsIndex
+    from typing_extensions import Self
+    from typing_extensions import SupportsIndex
 
     from pendulum.helpers import PreciseDiff
-    from pendulum.locales.locale import Locale  # noqa
+    from pendulum.locales.locale import Locale
 
 
 class Interval(Duration):
     """
-    A period of time between two datetimes.
+    An interval of time between two datetimes.
     """
 
     @overload
@@ -35,7 +37,7 @@ class Interval(Duration):
         start: pendulum.DateTime | datetime,
         end: pendulum.DateTime | datetime,
         absolute: bool = False,
-    ) -> Interval:
+    ) -> Self:
         ...
 
     @overload
@@ -44,7 +46,7 @@ class Interval(Duration):
         start: pendulum.Date | date,
         end: pendulum.Date | date,
         absolute: bool = False,
-    ) -> Interval:
+    ) -> Self:
         ...
 
     def __new__(
@@ -52,14 +54,16 @@ class Interval(Duration):
         start: pendulum.DateTime | pendulum.Date | datetime | date,
         end: pendulum.DateTime | pendulum.Date | datetime | date,
         absolute: bool = False,
-    ) -> Interval:
+    ) -> Self:
         if (
             isinstance(start, datetime)
             and not isinstance(end, datetime)
             or not isinstance(start, datetime)
             and isinstance(end, datetime)
         ):
-            raise ValueError("Both start and end of a Period must have the same type")
+            raise ValueError(
+                "Both start and end of an Interval must have the same type"
+            )
 
         if (
             isinstance(start, datetime)
@@ -125,7 +129,7 @@ class Interval(Duration):
 
         delta: timedelta = _end - _start  # type: ignore[operator]
 
-        return cast(Interval, super().__new__(cls, seconds=delta.total_seconds()))
+        return super().__new__(cls, seconds=delta.total_seconds())
 
     def __init__(
         self,
@@ -232,13 +236,13 @@ class Interval(Duration):
 
     def in_years(self) -> int:
         """
-        Gives the duration of the Period in full years.
+        Gives the duration of the Interval in full years.
         """
         return self.years
 
     def in_months(self) -> int:
         """
-        Gives the duration of the Period in full months.
+        Gives the duration of the Interval in full months.
         """
         return self.years * MONTHS_PER_YEAR + self.months
 
@@ -263,9 +267,9 @@ class Interval(Duration):
         :param locale: The locale to use. Defaults to current locale.
         :param separator: The separator to use between each unit
         """
-        from pendulum.locales.locale import Locale  # noqa
+        from pendulum.locales.locale import Locale
 
-        periods = [
+        intervals = [
             ("year", self.years),
             ("month", self.months),
             ("week", self.weeks),
@@ -276,13 +280,13 @@ class Interval(Duration):
         ]
         loaded_locale: Locale = Locale.load(locale or pendulum.get_locale())
         parts = []
-        for period in periods:
-            unit, period_count = period
-            if abs(period_count) > 0:
+        for interval in intervals:
+            unit, interval_count = interval
+            if abs(interval_count) > 0:
                 translation = loaded_locale.translation(
-                    f"units.{unit}.{loaded_locale.plural(abs(period_count))}"
+                    f"units.{unit}.{loaded_locale.plural(abs(interval_count))}"
                 )
-                parts.append(translation.format(period_count))
+                parts.append(translation.format(interval_count))
 
         if not parts:
             count: str | int = 0
@@ -316,9 +320,9 @@ class Interval(Duration):
 
             i += amount
 
-    def as_interval(self) -> Duration:
+    def as_duration(self) -> Duration:
         """
-        Return the Period as a Duration.
+        Return the Interval as a Duration.
         """
         return Duration(seconds=self.total_seconds())
 
@@ -330,23 +334,23 @@ class Interval(Duration):
     ) -> bool:
         return self.start <= item <= self.end
 
-    def __add__(self, other: timedelta) -> Duration:
-        return self.as_interval().__add__(other)
+    def __add__(self, other: timedelta) -> Duration:  # type: ignore[override]
+        return self.as_duration().__add__(other)
 
-    __radd__ = __add__
+    __radd__ = __add__  # type: ignore[assignment]
 
-    def __sub__(self, other: timedelta) -> Duration:
-        return self.as_interval().__sub__(other)
+    def __sub__(self, other: timedelta) -> Duration:  # type: ignore[override]
+        return self.as_duration().__sub__(other)
 
-    def __neg__(self) -> Interval:
+    def __neg__(self) -> Self:
         return self.__class__(self.end, self.start, self._absolute)
 
-    def __mul__(self, other: int | float) -> Duration:
-        return self.as_interval().__mul__(other)
+    def __mul__(self, other: int | float) -> Duration:  # type: ignore[override]
+        return self.as_duration().__mul__(other)
 
-    __rmul__ = __mul__
+    __rmul__ = __mul__  # type: ignore[assignment]
 
-    @overload
+    @overload  # type: ignore[override]
     def __floordiv__(self, other: timedelta) -> int:
         ...
 
@@ -355,11 +359,11 @@ class Interval(Duration):
         ...
 
     def __floordiv__(self, other: int | timedelta) -> int | Duration:
-        return self.as_interval().__floordiv__(other)
+        return self.as_duration().__floordiv__(other)
 
     __div__ = __floordiv__  # type: ignore[assignment]
 
-    @overload
+    @overload  # type: ignore[override]
     def __truediv__(self, other: timedelta) -> float:
         ...
 
@@ -368,19 +372,19 @@ class Interval(Duration):
         ...
 
     def __truediv__(self, other: float | timedelta) -> Duration | float:
-        return self.as_interval().__truediv__(other)
+        return self.as_duration().__truediv__(other)
 
-    def __mod__(self, other: timedelta) -> Duration:
-        return self.as_interval().__mod__(other)
+    def __mod__(self, other: timedelta) -> Duration:  # type: ignore[override]
+        return self.as_duration().__mod__(other)
 
     def __divmod__(self, other: timedelta) -> tuple[int, Duration]:
-        return self.as_interval().__divmod__(other)
+        return self.as_duration().__divmod__(other)
 
-    def __abs__(self) -> Interval:
+    def __abs__(self) -> Self:
         return self.__class__(self.start, self.end, absolute=True)
 
     def __repr__(self) -> str:
-        return f"<Period [{self._start} -> {self._end}]>"
+        return f"<Interval [{self._start} -> {self._end}]>"
 
     def __str__(self) -> str:
         return self.__repr__()
@@ -413,7 +417,7 @@ class Interval(Duration):
     def __reduce__(
         self,
     ) -> tuple[
-        type[Interval],
+        type[Self],
         tuple[
             pendulum.DateTime | pendulum.Date | datetime | date,
             pendulum.DateTime | pendulum.Date | datetime | date,
@@ -425,7 +429,7 @@ class Interval(Duration):
     def __reduce_ex__(
         self, protocol: SupportsIndex
     ) -> tuple[
-        type[Interval],
+        type[Self],
         tuple[
             pendulum.DateTime | pendulum.Date | datetime | date,
             pendulum.DateTime | pendulum.Date | datetime | date,
@@ -445,4 +449,7 @@ class Interval(Duration):
                 other._absolute,
             )
         else:
-            return self.as_interval() == other
+            return self.as_duration() == other
+
+    def __ne__(self, other: object) -> bool:
+        return not self.__eq__(other)
diff --git a/pendulum/_extensions/__init__.py b/src/pendulum/locales/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/_extensions/__init__.py
+++ b/src/pendulum/locales/__init__.py
diff --git a/pendulum/locales/__init__.py b/src/pendulum/locales/cs/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/__init__.py
+++ b/src/pendulum/locales/cs/__init__.py
diff --git a/pendulum/locales/cs/custom.py b/src/pendulum/locales/cs/custom.py
index 5f66b69..c909f32 100644
--- a/pendulum/locales/cs/custom.py
+++ b/src/pendulum/locales/cs/custom.py
@@ -1,6 +1,8 @@
 """
 cs custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     "units": {"few_second": "pár vteřin"},
diff --git a/pendulum/locales/cs/locale.py b/src/pendulum/locales/cs/locale.py
index 2c51c78..b44d0f7 100644
--- a/pendulum/locales/cs/locale.py
+++ b/src/pendulum/locales/cs/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.cs.custom import translations as custom_translations
 
 
 """
@@ -20,40 +22,40 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "ne",
-                1: "po",
-                2: "út",
-                3: "st",
-                4: "čt",
-                5: "pá",
-                6: "so",
+                0: "po",
+                1: "út",
+                2: "st",
+                3: "čt",
+                4: "pá",
+                5: "so",
+                6: "ne",
             },
             "narrow": {
-                0: "N",
-                1: "P",
-                2: "Ú",
-                3: "S",
-                4: "Č",
-                5: "P",
-                6: "S",
+                0: "P",
+                1: "Ú",
+                2: "S",
+                3: "Č",
+                4: "P",
+                5: "S",
+                6: "N",
             },
             "short": {
-                0: "ne",
-                1: "po",
-                2: "út",
-                3: "st",
-                4: "čt",
-                5: "pá",
-                6: "so",
+                0: "po",
+                1: "út",
+                2: "st",
+                3: "čt",
+                4: "pá",
+                5: "so",
+                6: "ne",
             },
             "wide": {
-                0: "neděle",
-                1: "pondělí",
-                2: "úterý",
-                3: "středa",
-                4: "čtvrtek",
-                5: "pátek",
-                6: "sobota",
+                0: "pondělí",
+                1: "úterý",
+                2: "středa",
+                3: "čtvrtek",
+                4: "pátek",
+                5: "sobota",
+                6: "neděle",
             },
         },
         "months": {
@@ -261,6 +263,12 @@ locale = {
             "evening1": "večer",
             "night1": "v noci",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/cs/__init__.py b/src/pendulum/locales/da/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/cs/__init__.py
+++ b/src/pendulum/locales/da/__init__.py
diff --git a/pendulum/locales/da/custom.py b/src/pendulum/locales/da/custom.py
index c62ab83..57e68f4 100644
--- a/pendulum/locales/da/custom.py
+++ b/src/pendulum/locales/da/custom.py
@@ -1,6 +1,8 @@
 """
 da custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     # Relative time
diff --git a/pendulum/locales/da/locale.py b/src/pendulum/locales/da/locale.py
index 936af3a..2385de5 100644
--- a/pendulum/locales/da/locale.py
+++ b/src/pendulum/locales/da/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.da.custom import translations as custom_translations
 
 
 """
@@ -19,24 +21,24 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "søn.",
-                1: "man.",
-                2: "tir.",
-                3: "ons.",
-                4: "tor.",
-                5: "fre.",
-                6: "lør.",
+                0: "man.",
+                1: "tir.",
+                2: "ons.",
+                3: "tor.",
+                4: "fre.",
+                5: "lør.",
+                6: "søn.",
             },
-            "narrow": {0: "S", 1: "M", 2: "T", 3: "O", 4: "T", 5: "F", 6: "L"},
-            "short": {0: "sø", 1: "ma", 2: "ti", 3: "on", 4: "to", 5: "fr", 6: "lø"},
+            "narrow": {0: "M", 1: "T", 2: "O", 3: "T", 4: "F", 5: "L", 6: "S"},
+            "short": {0: "ma", 1: "ti", 2: "on", 3: "to", 4: "fr", 5: "lø", 6: "sø"},
             "wide": {
-                0: "søndag",
-                1: "mandag",
-                2: "tirsdag",
-                3: "onsdag",
-                4: "torsdag",
-                5: "fredag",
-                6: "lørdag",
+                0: "mandag",
+                1: "tirsdag",
+                2: "onsdag",
+                3: "torsdag",
+                4: "fredag",
+                5: "lørdag",
+                6: "søndag",
             },
         },
         "months": {
@@ -142,6 +144,12 @@ locale = {
             "evening1": "om aftenen",
             "night1": "om natten",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/da/__init__.py b/src/pendulum/locales/de/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/da/__init__.py
+++ b/src/pendulum/locales/de/__init__.py
diff --git a/pendulum/locales/de/custom.py b/src/pendulum/locales/de/custom.py
index a19a8e1..8ef06cc 100644
--- a/pendulum/locales/de/custom.py
+++ b/src/pendulum/locales/de/custom.py
@@ -1,6 +1,8 @@
 """
 de custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     # Relative time
diff --git a/pendulum/locales/de/locale.py b/src/pendulum/locales/de/locale.py
index 94d2ff1..7781c3f 100644
--- a/pendulum/locales/de/locale.py
+++ b/src/pendulum/locales/de/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.de.custom import translations as custom_translations
 
 
 """
@@ -16,32 +18,32 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "So.",
-                1: "Mo.",
-                2: "Di.",
-                3: "Mi.",
-                4: "Do.",
-                5: "Fr.",
-                6: "Sa.",
+                0: "Mo.",
+                1: "Di.",
+                2: "Mi.",
+                3: "Do.",
+                4: "Fr.",
+                5: "Sa.",
+                6: "So.",
             },
-            "narrow": {0: "S", 1: "M", 2: "D", 3: "M", 4: "D", 5: "F", 6: "S"},
+            "narrow": {0: "M", 1: "D", 2: "M", 3: "D", 4: "F", 5: "S", 6: "S"},
             "short": {
-                0: "So.",
-                1: "Mo.",
-                2: "Di.",
-                3: "Mi.",
-                4: "Do.",
-                5: "Fr.",
-                6: "Sa.",
+                0: "Mo.",
+                1: "Di.",
+                2: "Mi.",
+                3: "Do.",
+                4: "Fr.",
+                5: "Sa.",
+                6: "So.",
             },
             "wide": {
-                0: "Sonntag",
-                1: "Montag",
-                2: "Dienstag",
-                3: "Mittwoch",
-                4: "Donnerstag",
-                5: "Freitag",
-                6: "Samstag",
+                0: "Montag",
+                1: "Dienstag",
+                2: "Mittwoch",
+                3: "Donnerstag",
+                4: "Freitag",
+                5: "Samstag",
+                6: "Sonntag",
             },
         },
         "months": {
@@ -139,6 +141,12 @@ locale = {
             "evening1": "abends",
             "night1": "nachts",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/de/__init__.py b/src/pendulum/locales/en/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/de/__init__.py
+++ b/src/pendulum/locales/en/__init__.py
diff --git a/pendulum/locales/en/custom.py b/src/pendulum/locales/en/custom.py
index a403ad8..65cf467 100644
--- a/pendulum/locales/en/custom.py
+++ b/src/pendulum/locales/en/custom.py
@@ -1,6 +1,8 @@
 """
 en custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     "units": {"few_second": "a few seconds"},
diff --git a/pendulum/locales/en/locale.py b/src/pendulum/locales/en/locale.py
index 00eafc2..4f05c2f 100644
--- a/pendulum/locales/en/locale.py
+++ b/src/pendulum/locales/en/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.en.custom import translations as custom_translations
 
 
 """
@@ -31,24 +33,24 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "Sun",
-                1: "Mon",
-                2: "Tue",
-                3: "Wed",
-                4: "Thu",
-                5: "Fri",
-                6: "Sat",
+                0: "Mon",
+                1: "Tue",
+                2: "Wed",
+                3: "Thu",
+                4: "Fri",
+                5: "Sat",
+                6: "Sun",
             },
-            "narrow": {0: "S", 1: "M", 2: "T", 3: "W", 4: "T", 5: "F", 6: "S"},
-            "short": {0: "Su", 1: "Mo", 2: "Tu", 3: "We", 4: "Th", 5: "Fr", 6: "Sa"},
+            "narrow": {0: "M", 1: "T", 2: "W", 3: "T", 4: "F", 5: "S", 6: "S"},
+            "short": {0: "Mo", 1: "Tu", 2: "We", 3: "Th", 4: "Fr", 5: "Sa", 6: "Su"},
             "wide": {
-                0: "Sunday",
-                1: "Monday",
-                2: "Tuesday",
-                3: "Wednesday",
-                4: "Thursday",
-                5: "Friday",
-                6: "Saturday",
+                0: "Monday",
+                1: "Tuesday",
+                2: "Wednesday",
+                3: "Thursday",
+                4: "Friday",
+                5: "Saturday",
+                6: "Sunday",
             },
         },
         "months": {
@@ -145,6 +147,12 @@ locale = {
             "evening1": "in the evening",
             "night1": "at night",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 6,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/en/__init__.py b/src/pendulum/locales/en_gb/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/en/__init__.py
+++ b/src/pendulum/locales/en_gb/__init__.py
diff --git a/src/pendulum/locales/en_gb/custom.py b/src/pendulum/locales/en_gb/custom.py
new file mode 100644
index 0000000..2c77a69
--- /dev/null
+++ b/src/pendulum/locales/en_gb/custom.py
@@ -0,0 +1,25 @@
+"""
+en-gb custom locale file.
+"""
+from __future__ import annotations
+
+
+translations = {
+    "units": {"few_second": "a few seconds"},
+    # Relative time
+    "ago": "{} ago",
+    "from_now": "in {}",
+    "after": "{0} after",
+    "before": "{0} before",
+    # Ordinals
+    "ordinal": {"one": "st", "two": "nd", "few": "rd", "other": "th"},
+    # Date formats
+    "date_formats": {
+        "LTS": "HH:mm:ss",
+        "LT": "HH:mm",
+        "L": "DD/MM/YYYY",
+        "LL": "D MMMM YYYY",
+        "LLL": "D MMMM YYYY HH:mm",
+        "LLLL": "dddd, D MMMM YYYY HH:mm",
+    },
+}
diff --git a/src/pendulum/locales/en_gb/locale.py b/src/pendulum/locales/en_gb/locale.py
new file mode 100644
index 0000000..c25f7d5
--- /dev/null
+++ b/src/pendulum/locales/en_gb/locale.py
@@ -0,0 +1,240 @@
+from __future__ import annotations
+
+from pendulum.locales.en_gb.custom import translations as custom_translations
+
+
+"""
+en-gb locale file.
+
+It has been generated automatically and must not be modified directly.
+"""
+
+
+locale = {
+    "plural": lambda n: "one"
+    if ((n == n and (n == 1)) and (0 == 0 and (0 == 0)))
+    else "other",
+    "ordinal": lambda n: "few"
+    if (
+        ((n % 10) == (n % 10) and ((n % 10) == 3))
+        and (not ((n % 100) == (n % 100) and ((n % 100) == 13)))
+    )
+    else "one"
+    if (
+        ((n % 10) == (n % 10) and ((n % 10) == 1))
+        and (not ((n % 100) == (n % 100) and ((n % 100) == 11)))
+    )
+    else "two"
+    if (
+        ((n % 10) == (n % 10) and ((n % 10) == 2))
+        and (not ((n % 100) == (n % 100) and ((n % 100) == 12)))
+    )
+    else "other",
+    "translations": {
+        "days": {
+            "abbreviated": {
+                0: "Mon",
+                1: "Tue",
+                2: "Wed",
+                3: "Thu",
+                4: "Fri",
+                5: "Sat",
+                6: "Sun",
+            },
+            "narrow": {
+                0: "M",
+                1: "T",
+                2: "W",
+                3: "T",
+                4: "F",
+                5: "S",
+                6: "S",
+            },
+            "short": {
+                0: "Mo",
+                1: "Tu",
+                2: "We",
+                3: "Th",
+                4: "Fr",
+                5: "Sa",
+                6: "Su",
+            },
+            "wide": {
+                0: "Monday",
+                1: "Tuesday",
+                2: "Wednesday",
+                3: "Thursday",
+                4: "Friday",
+                5: "Saturday",
+                6: "Sunday",
+            },
+        },
+        "months": {
+            "abbreviated": {
+                1: "Jan",
+                2: "Feb",
+                3: "Mar",
+                4: "Apr",
+                5: "May",
+                6: "Jun",
+                7: "Jul",
+                8: "Aug",
+                9: "Sept",
+                10: "Oct",
+                11: "Nov",
+                12: "Dec",
+            },
+            "narrow": {
+                1: "J",
+                2: "F",
+                3: "M",
+                4: "A",
+                5: "M",
+                6: "J",
+                7: "J",
+                8: "A",
+                9: "S",
+                10: "O",
+                11: "N",
+                12: "D",
+            },
+            "wide": {
+                1: "January",
+                2: "February",
+                3: "March",
+                4: "April",
+                5: "May",
+                6: "June",
+                7: "July",
+                8: "August",
+                9: "September",
+                10: "October",
+                11: "November",
+                12: "December",
+            },
+        },
+        "units": {
+            "year": {
+                "one": "{0} year",
+                "other": "{0} years",
+            },
+            "month": {
+                "one": "{0} month",
+                "other": "{0} months",
+            },
+            "week": {
+                "one": "{0} week",
+                "other": "{0} weeks",
+            },
+            "day": {
+                "one": "{0} day",
+                "other": "{0} days",
+            },
+            "hour": {
+                "one": "{0} hour",
+                "other": "{0} hours",
+            },
+            "minute": {
+                "one": "{0} minute",
+                "other": "{0} minutes",
+            },
+            "second": {
+                "one": "{0} second",
+                "other": "{0} seconds",
+            },
+            "microsecond": {
+                "one": "{0} microsecond",
+                "other": "{0} microseconds",
+            },
+        },
+        "relative": {
+            "year": {
+                "future": {
+                    "other": "in {0} years",
+                    "one": "in {0} year",
+                },
+                "past": {
+                    "other": "{0} years ago",
+                    "one": "{0} year ago",
+                },
+            },
+            "month": {
+                "future": {
+                    "other": "in {0} months",
+                    "one": "in {0} month",
+                },
+                "past": {
+                    "other": "{0} months ago",
+                    "one": "{0} month ago",
+                },
+            },
+            "week": {
+                "future": {
+                    "other": "in {0} weeks",
+                    "one": "in {0} week",
+                },
+                "past": {
+                    "other": "{0} weeks ago",
+                    "one": "{0} week ago",
+                },
+            },
+            "day": {
+                "future": {
+                    "other": "in {0} days",
+                    "one": "in {0} day",
+                },
+                "past": {
+                    "other": "{0} days ago",
+                    "one": "{0} day ago",
+                },
+            },
+            "hour": {
+                "future": {
+                    "other": "in {0} hours",
+                    "one": "in {0} hour",
+                },
+                "past": {
+                    "other": "{0} hours ago",
+                    "one": "{0} hour ago",
+                },
+            },
+            "minute": {
+                "future": {
+                    "other": "in {0} minutes",
+                    "one": "in {0} minute",
+                },
+                "past": {
+                    "other": "{0} minutes ago",
+                    "one": "{0} minute ago",
+                },
+            },
+            "second": {
+                "future": {
+                    "other": "in {0} seconds",
+                    "one": "in {0} second",
+                },
+                "past": {
+                    "other": "{0} seconds ago",
+                    "one": "{0} second ago",
+                },
+            },
+        },
+        "day_periods": {
+            "midnight": "midnight",
+            "am": "am",
+            "noon": "noon",
+            "pm": "pm",
+            "morning1": "in the morning",
+            "afternoon1": "in the afternoon",
+            "evening1": "in the evening",
+            "night1": "at night",
+        },
+        "week_data": {
+            "min_days": 4,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
+    },
+    "custom": custom_translations,
+}
diff --git a/pendulum/locales/es/__init__.py b/src/pendulum/locales/en_us/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/es/__init__.py
+++ b/src/pendulum/locales/en_us/__init__.py
diff --git a/src/pendulum/locales/en_us/custom.py b/src/pendulum/locales/en_us/custom.py
new file mode 100644
index 0000000..72d2005
--- /dev/null
+++ b/src/pendulum/locales/en_us/custom.py
@@ -0,0 +1,25 @@
+"""
+en-us custom locale file.
+"""
+from __future__ import annotations
+
+
+translations = {
+    "units": {"few_second": "a few seconds"},
+    # Relative time
+    "ago": "{} ago",
+    "from_now": "in {}",
+    "after": "{0} after",
+    "before": "{0} before",
+    # Ordinals
+    "ordinal": {"one": "st", "two": "nd", "few": "rd", "other": "th"},
+    # Date formats
+    "date_formats": {
+        "LTS": "h:mm:ss A",
+        "LT": "h:mm A",
+        "L": "MM/DD/YYYY",
+        "LL": "MMMM D, YYYY",
+        "LLL": "MMMM D, YYYY h:mm A",
+        "LLLL": "dddd, MMMM D, YYYY h:mm A",
+    },
+}
diff --git a/src/pendulum/locales/en_us/locale.py b/src/pendulum/locales/en_us/locale.py
new file mode 100644
index 0000000..7f40f3f
--- /dev/null
+++ b/src/pendulum/locales/en_us/locale.py
@@ -0,0 +1,240 @@
+from __future__ import annotations
+
+from pendulum.locales.en_us.custom import translations as custom_translations
+
+
+"""
+en-us locale file.
+
+It has been generated automatically and must not be modified directly.
+"""
+
+
+locale = {
+    "plural": lambda n: "one"
+    if ((n == n and (n == 1)) and (0 == 0 and (0 == 0)))
+    else "other",
+    "ordinal": lambda n: "few"
+    if (
+        ((n % 10) == (n % 10) and ((n % 10) == 3))
+        and (not ((n % 100) == (n % 100) and ((n % 100) == 13)))
+    )
+    else "one"
+    if (
+        ((n % 10) == (n % 10) and ((n % 10) == 1))
+        and (not ((n % 100) == (n % 100) and ((n % 100) == 11)))
+    )
+    else "two"
+    if (
+        ((n % 10) == (n % 10) and ((n % 10) == 2))
+        and (not ((n % 100) == (n % 100) and ((n % 100) == 12)))
+    )
+    else "other",
+    "translations": {
+        "days": {
+            "abbreviated": {
+                0: "Mon",
+                1: "Tue",
+                2: "Wed",
+                3: "Thu",
+                4: "Fri",
+                5: "Sat",
+                6: "Sun",
+            },
+            "narrow": {
+                0: "M",
+                1: "T",
+                2: "W",
+                3: "T",
+                4: "F",
+                5: "S",
+                6: "S",
+            },
+            "short": {
+                0: "Mo",
+                1: "Tu",
+                2: "We",
+                3: "Th",
+                4: "Fr",
+                5: "Sa",
+                6: "Su",
+            },
+            "wide": {
+                0: "Monday",
+                1: "Tuesday",
+                2: "Wednesday",
+                3: "Thursday",
+                4: "Friday",
+                5: "Saturday",
+                6: "Sunday",
+            },
+        },
+        "months": {
+            "abbreviated": {
+                1: "Jan",
+                2: "Feb",
+                3: "Mar",
+                4: "Apr",
+                5: "May",
+                6: "Jun",
+                7: "Jul",
+                8: "Aug",
+                9: "Sep",
+                10: "Oct",
+                11: "Nov",
+                12: "Dec",
+            },
+            "narrow": {
+                1: "J",
+                2: "F",
+                3: "M",
+                4: "A",
+                5: "M",
+                6: "J",
+                7: "J",
+                8: "A",
+                9: "S",
+                10: "O",
+                11: "N",
+                12: "D",
+            },
+            "wide": {
+                1: "January",
+                2: "February",
+                3: "March",
+                4: "April",
+                5: "May",
+                6: "June",
+                7: "July",
+                8: "August",
+                9: "September",
+                10: "October",
+                11: "November",
+                12: "December",
+            },
+        },
+        "units": {
+            "year": {
+                "one": "{0} year",
+                "other": "{0} years",
+            },
+            "month": {
+                "one": "{0} month",
+                "other": "{0} months",
+            },
+            "week": {
+                "one": "{0} week",
+                "other": "{0} weeks",
+            },
+            "day": {
+                "one": "{0} day",
+                "other": "{0} days",
+            },
+            "hour": {
+                "one": "{0} hour",
+                "other": "{0} hours",
+            },
+            "minute": {
+                "one": "{0} minute",
+                "other": "{0} minutes",
+            },
+            "second": {
+                "one": "{0} second",
+                "other": "{0} seconds",
+            },
+            "microsecond": {
+                "one": "{0} microsecond",
+                "other": "{0} microseconds",
+            },
+        },
+        "relative": {
+            "year": {
+                "future": {
+                    "other": "in {0} years",
+                    "one": "in {0} year",
+                },
+                "past": {
+                    "other": "{0} years ago",
+                    "one": "{0} year ago",
+                },
+            },
+            "month": {
+                "future": {
+                    "other": "in {0} months",
+                    "one": "in {0} month",
+                },
+                "past": {
+                    "other": "{0} months ago",
+                    "one": "{0} month ago",
+                },
+            },
+            "week": {
+                "future": {
+                    "other": "in {0} weeks",
+                    "one": "in {0} week",
+                },
+                "past": {
+                    "other": "{0} weeks ago",
+                    "one": "{0} week ago",
+                },
+            },
+            "day": {
+                "future": {
+                    "other": "in {0} days",
+                    "one": "in {0} day",
+                },
+                "past": {
+                    "other": "{0} days ago",
+                    "one": "{0} day ago",
+                },
+            },
+            "hour": {
+                "future": {
+                    "other": "in {0} hours",
+                    "one": "in {0} hour",
+                },
+                "past": {
+                    "other": "{0} hours ago",
+                    "one": "{0} hour ago",
+                },
+            },
+            "minute": {
+                "future": {
+                    "other": "in {0} minutes",
+                    "one": "in {0} minute",
+                },
+                "past": {
+                    "other": "{0} minutes ago",
+                    "one": "{0} minute ago",
+                },
+            },
+            "second": {
+                "future": {
+                    "other": "in {0} seconds",
+                    "one": "in {0} second",
+                },
+                "past": {
+                    "other": "{0} seconds ago",
+                    "one": "{0} second ago",
+                },
+            },
+        },
+        "day_periods": {
+            "midnight": "midnight",
+            "am": "AM",
+            "noon": "noon",
+            "pm": "PM",
+            "morning1": "in the morning",
+            "afternoon1": "in the afternoon",
+            "evening1": "in the evening",
+            "night1": "at night",
+        },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 6,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
+    },
+    "custom": custom_translations,
+}
diff --git a/pendulum/locales/fa/__init__.py b/src/pendulum/locales/es/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/fa/__init__.py
+++ b/src/pendulum/locales/es/__init__.py
diff --git a/pendulum/locales/es/custom.py b/src/pendulum/locales/es/custom.py
index 4b7e2b5..4acb411 100644
--- a/pendulum/locales/es/custom.py
+++ b/src/pendulum/locales/es/custom.py
@@ -1,6 +1,8 @@
 """
 es custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     "units": {"few_second": "unos segundos"},
diff --git a/pendulum/locales/es/locale.py b/src/pendulum/locales/es/locale.py
index edba4d3..4ab2784 100644
--- a/pendulum/locales/es/locale.py
+++ b/src/pendulum/locales/es/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.es.custom import translations as custom_translations
 
 
 """
@@ -14,24 +16,24 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "dom.",
-                1: "lun.",
-                2: "mar.",
-                3: "mié.",
-                4: "jue.",
-                5: "vie.",
-                6: "sáb.",
+                0: "lun.",
+                1: "mar.",
+                2: "mié.",
+                3: "jue.",
+                4: "vie.",
+                5: "sáb.",
+                6: "dom.",
             },
-            "narrow": {0: "D", 1: "L", 2: "M", 3: "X", 4: "J", 5: "V", 6: "S"},
-            "short": {0: "DO", 1: "LU", 2: "MA", 3: "MI", 4: "JU", 5: "VI", 6: "SA"},
+            "narrow": {0: "L", 1: "M", 2: "X", 3: "J", 4: "V", 5: "S", 6: "D"},
+            "short": {0: "LU", 1: "MA", 2: "MI", 3: "JU", 4: "VI", 5: "SA", 6: "DO"},
             "wide": {
-                0: "domingo",
-                1: "lunes",
-                2: "martes",
-                3: "miércoles",
-                4: "jueves",
-                5: "viernes",
-                6: "sábado",
+                0: "lunes",
+                1: "martes",
+                2: "miércoles",
+                3: "jueves",
+                4: "viernes",
+                5: "sábado",
+                6: "domingo",
             },
         },
         "months": {
@@ -136,6 +138,12 @@ locale = {
             "evening1": "de la tarde",
             "night1": "de la noche",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/fo/__init__.py b/src/pendulum/locales/fa/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/fo/__init__.py
+++ b/src/pendulum/locales/fa/__init__.py
diff --git a/pendulum/locales/fa/custom.py b/src/pendulum/locales/fa/custom.py
index 082bfad..e4b4a60 100644
--- a/pendulum/locales/fa/custom.py
+++ b/src/pendulum/locales/fa/custom.py
@@ -1,6 +1,8 @@
 """
 fa custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     # Relative time
diff --git a/pendulum/locales/fa/locale.py b/src/pendulum/locales/fa/locale.py
index 32f8e5f..1c3f6c5 100644
--- a/pendulum/locales/fa/locale.py
+++ b/src/pendulum/locales/fa/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.fa.custom import translations as custom_translations
 
 
 """
@@ -16,24 +18,24 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "یکشنبه",
-                1: "دوشنبه",
-                2: "سه\u200cشنبه",
-                3: "چهارشنبه",
-                4: "پنجشنبه",
-                5: "جمعه",
-                6: "شنبه",
+                0: "دوشنبه",
+                1: "سه\u200cشنبه",
+                2: "چهارشنبه",
+                3: "پنجشنبه",
+                4: "جمعه",
+                5: "شنبه",
+                6: "یکشنبه",
             },
-            "narrow": {0: "ی", 1: "د", 2: "س", 3: "چ", 4: "پ", 5: "ج", 6: "ش"},
-            "short": {0: "۱ش", 1: "۲ش", 2: "۳ش", 3: "۴ش", 4: "۵ش", 5: "ج", 6: "ش"},
+            "narrow": {0: "د", 1: "س", 2: "چ", 3: "پ", 4: "ج", 5: "ش", 6: "ی"},
+            "short": {0: "۲ش", 1: "۳ش", 2: "۴ش", 3: "۵ش", 4: "ج", 5: "ش", 6: "۱ش"},
             "wide": {
-                0: "یکشنبه",
-                1: "دوشنبه",
-                2: "سه\u200cشنبه",
-                3: "چهارشنبه",
-                4: "پنجشنبه",
-                5: "جمعه",
-                6: "شنبه",
+                0: "دوشنبه",
+                1: "سه\u200cشنبه",
+                2: "چهارشنبه",
+                3: "پنجشنبه",
+                4: "جمعه",
+                5: "شنبه",
+                6: "یکشنبه",
             },
         },
         "months": {
@@ -130,6 +132,12 @@ locale = {
             "evening1": "عصر",
             "night1": "شب",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/fr/__init__.py b/src/pendulum/locales/fo/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/fr/__init__.py
+++ b/src/pendulum/locales/fo/__init__.py
diff --git a/pendulum/locales/fo/custom.py b/src/pendulum/locales/fo/custom.py
index 456dd59..3f0fd1c 100644
--- a/pendulum/locales/fo/custom.py
+++ b/src/pendulum/locales/fo/custom.py
@@ -1,6 +1,8 @@
 """
 fo custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     # Relative time
diff --git a/pendulum/locales/fo/locale.py b/src/pendulum/locales/fo/locale.py
index 10319ea..28ec0c0 100644
--- a/pendulum/locales/fo/locale.py
+++ b/src/pendulum/locales/fo/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.fo.custom import translations as custom_translations
 
 
 """
@@ -14,32 +16,32 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "sun.",
-                1: "mán.",
-                2: "týs.",
-                3: "mik.",
-                4: "hós.",
-                5: "frí.",
-                6: "ley.",
+                0: "mán.",
+                1: "týs.",
+                2: "mik.",
+                3: "hós.",
+                4: "frí.",
+                5: "ley.",
+                6: "sun.",
             },
-            "narrow": {0: "S", 1: "M", 2: "T", 3: "M", 4: "H", 5: "F", 6: "L"},
+            "narrow": {0: "M", 1: "T", 2: "M", 3: "H", 4: "F", 5: "L", 6: "S"},
             "short": {
-                0: "su.",
-                1: "má.",
-                2: "tý.",
-                3: "mi.",
-                4: "hó.",
-                5: "fr.",
-                6: "le.",
+                0: "má.",
+                1: "tý.",
+                2: "mi.",
+                3: "hó.",
+                4: "fr.",
+                5: "le.",
+                6: "su.",
             },
             "wide": {
-                0: "sunnudagur",
-                1: "mánadagur",
-                2: "týsdagur",
-                3: "mikudagur",
-                4: "hósdagur",
-                5: "fríggjadagur",
-                6: "leygardagur",
+                0: "mánadagur",
+                1: "týsdagur",
+                2: "mikudagur",
+                3: "hósdagur",
+                4: "fríggjadagur",
+                5: "leygardagur",
+                6: "sunnudagur",
             },
         },
         "months": {
@@ -127,6 +129,12 @@ locale = {
             },
         },
         "day_periods": {"am": "AM", "pm": "PM"},
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/he/__init__.py b/src/pendulum/locales/fr/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/he/__init__.py
+++ b/src/pendulum/locales/fr/__init__.py
diff --git a/pendulum/locales/fr/custom.py b/src/pendulum/locales/fr/custom.py
index 134f297..913656c 100644
--- a/pendulum/locales/fr/custom.py
+++ b/src/pendulum/locales/fr/custom.py
@@ -1,6 +1,8 @@
 """
 fr custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     "units": {"few_second": "quelques secondes"},
diff --git a/pendulum/locales/fr/locale.py b/src/pendulum/locales/fr/locale.py
index 8855d53..30ee8cd 100644
--- a/pendulum/locales/fr/locale.py
+++ b/src/pendulum/locales/fr/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.fr.custom import translations as custom_translations
 
 
 """
@@ -14,24 +16,24 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "dim.",
-                1: "lun.",
-                2: "mar.",
-                3: "mer.",
-                4: "jeu.",
-                5: "ven.",
-                6: "sam.",
+                0: "lun.",
+                1: "mar.",
+                2: "mer.",
+                3: "jeu.",
+                4: "ven.",
+                5: "sam.",
+                6: "dim.",
             },
-            "narrow": {0: "D", 1: "L", 2: "M", 3: "M", 4: "J", 5: "V", 6: "S"},
-            "short": {0: "di", 1: "lu", 2: "ma", 3: "me", 4: "je", 5: "ve", 6: "sa"},
+            "narrow": {0: "L", 1: "M", 2: "M", 3: "J", 4: "V", 5: "S", 6: "D"},
+            "short": {0: "lu", 1: "ma", 2: "me", 3: "je", 4: "ve", 5: "sa", 6: "di"},
             "wide": {
-                0: "dimanche",
-                1: "lundi",
-                2: "mardi",
-                3: "mercredi",
-                4: "jeudi",
-                5: "vendredi",
-                6: "samedi",
+                0: "lundi",
+                1: "mardi",
+                2: "mercredi",
+                3: "jeudi",
+                4: "vendredi",
+                5: "samedi",
+                6: "dimanche",
             },
         },
         "months": {
@@ -128,6 +130,12 @@ locale = {
             "evening1": "du soir",
             "night1": "de nuit",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/id/__init__.py b/src/pendulum/locales/he/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/id/__init__.py
+++ b/src/pendulum/locales/he/__init__.py
diff --git a/pendulum/locales/he/custom.py b/src/pendulum/locales/he/custom.py
index 51f8476..c8e1f70 100644
--- a/pendulum/locales/he/custom.py
+++ b/src/pendulum/locales/he/custom.py
@@ -1,6 +1,8 @@
 """
 he custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     "units": {"few_second": "כמה שניות"},
diff --git a/pendulum/locales/he/locale.py b/src/pendulum/locales/he/locale.py
index 457c101..42d55aa 100644
--- a/pendulum/locales/he/locale.py
+++ b/src/pendulum/locales/he/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.he.custom import translations as custom_translations
 
 
 """
@@ -23,40 +25,40 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "יום א׳",
-                1: "יום ב׳",
-                2: "יום ג׳",
-                3: "יום ד׳",
-                4: "יום ה׳",
-                5: "יום ו׳",
-                6: "שבת",
+                0: "יום ב׳",
+                1: "יום ג׳",
+                2: "יום ד׳",
+                3: "יום ה׳",
+                4: "יום ו׳",
+                5: "שבת",
+                6: "יום א׳",
             },
             "narrow": {
-                0: "א׳",
-                1: "ב׳",
-                2: "ג׳",
-                3: "ד׳",
-                4: "ה׳",
-                5: "ו׳",
-                6: "ש׳",
+                0: "ב׳",
+                1: "ג׳",
+                2: "ד׳",
+                3: "ה׳",
+                4: "ו׳",
+                5: "ש׳",
+                6: "א׳",
             },
             "short": {
-                0: "א׳",
-                1: "ב׳",
-                2: "ג׳",
-                3: "ד׳",
-                4: "ה׳",
-                5: "ו׳",
-                6: "ש׳",
+                0: "ב׳",
+                1: "ג׳",
+                2: "ד׳",
+                3: "ה׳",
+                4: "ו׳",
+                5: "ש׳",
+                6: "א׳",
             },
             "wide": {
-                0: "יום ראשון",
-                1: "יום שני",
-                2: "יום שלישי",
-                3: "יום רביעי",
-                4: "יום חמישי",
-                5: "יום שישי",
-                6: "יום שבת",
+                0: "יום שני",
+                1: "יום שלישי",
+                2: "יום רביעי",
+                3: "יום חמישי",
+                4: "יום שישי",
+                5: "יום שבת",
+                6: "יום ראשון",
             },
         },
         "months": {
@@ -264,6 +266,12 @@ locale = {
             "night1": "בלילה",
             "night2": "לפנות בוקר",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/it/__init__.py b/src/pendulum/locales/id/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/it/__init__.py
+++ b/src/pendulum/locales/id/__init__.py
diff --git a/pendulum/locales/id/custom.py b/src/pendulum/locales/id/custom.py
index 3ba2035..3d4460c 100644
--- a/pendulum/locales/id/custom.py
+++ b/src/pendulum/locales/id/custom.py
@@ -1,6 +1,8 @@
 """
 id custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     "units": {"few_second": "beberapa detik"},
diff --git a/pendulum/locales/id/locale.py b/src/pendulum/locales/id/locale.py
index bc994ce..2073357 100644
--- a/pendulum/locales/id/locale.py
+++ b/src/pendulum/locales/id/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.id.custom import translations as custom_translations
 
 
 """
@@ -14,32 +16,32 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "Min",
-                1: "Sen",
-                2: "Sel",
-                3: "Rab",
-                4: "Kam",
-                5: "Jum",
-                6: "Sab",
+                0: "Sen",
+                1: "Sel",
+                2: "Rab",
+                3: "Kam",
+                4: "Jum",
+                5: "Sab",
+                6: "Min",
             },
-            "narrow": {0: "M", 1: "S", 2: "S", 3: "R", 4: "K", 5: "J", 6: "S"},
+            "narrow": {0: "S", 1: "S", 2: "R", 3: "K", 4: "J", 5: "S", 6: "M"},
             "short": {
-                0: "Min",
-                1: "Sen",
-                2: "Sel",
-                3: "Rab",
-                4: "Kam",
-                5: "Jum",
-                6: "Sab",
+                0: "Sen",
+                1: "Sel",
+                2: "Rab",
+                3: "Kam",
+                4: "Jum",
+                5: "Sab",
+                6: "Min",
             },
             "wide": {
-                0: "Minggu",
-                1: "Senin",
-                2: "Selasa",
-                3: "Rabu",
-                4: "Kamis",
-                5: "Jumat",
-                6: "Sabtu",
+                0: "Senin",
+                1: "Selasa",
+                2: "Rabu",
+                3: "Kamis",
+                4: "Jumat",
+                5: "Sabtu",
+                6: "Minggu",
             },
         },
         "months": {
@@ -136,6 +138,12 @@ locale = {
             "evening1": "sore",
             "night1": "malam",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/ja/__init__.py b/src/pendulum/locales/it/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/ja/__init__.py
+++ b/src/pendulum/locales/it/__init__.py
diff --git a/pendulum/locales/it/custom.py b/src/pendulum/locales/it/custom.py
index e5cf1cc..b1a77a0 100644
--- a/pendulum/locales/it/custom.py
+++ b/src/pendulum/locales/it/custom.py
@@ -1,6 +1,7 @@
 """
 it custom locale file.
 """
+from __future__ import annotations
 
 
 translations = {
diff --git a/pendulum/locales/it/locale.py b/src/pendulum/locales/it/locale.py
index bb3fdcf..ae5dc39 100644
--- a/pendulum/locales/it/locale.py
+++ b/src/pendulum/locales/it/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.it.custom import translations as custom_translations
 
 
 """
@@ -18,32 +20,32 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "dom",
-                1: "lun",
-                2: "mar",
-                3: "mer",
-                4: "gio",
-                5: "ven",
-                6: "sab",
+                0: "lun",
+                1: "mar",
+                2: "mer",
+                3: "gio",
+                4: "ven",
+                5: "sab",
+                6: "dom",
             },
-            "narrow": {0: "D", 1: "L", 2: "M", 3: "M", 4: "G", 5: "V", 6: "S"},
+            "narrow": {0: "L", 1: "M", 2: "M", 3: "G", 4: "V", 5: "S", 6: "D"},
             "short": {
-                0: "dom",
-                1: "lun",
-                2: "mar",
-                3: "mer",
-                4: "gio",
-                5: "ven",
-                6: "sab",
+                0: "lun",
+                1: "mar",
+                2: "mer",
+                3: "gio",
+                4: "ven",
+                5: "sab",
+                6: "dom",
             },
             "wide": {
-                0: "domenica",
-                1: "lunedì",
-                2: "martedì",
-                3: "mercoledì",
-                4: "giovedì",
-                5: "venerdì",
-                6: "sabato",
+                0: "lunedì",
+                1: "martedì",
+                2: "mercoledì",
+                3: "giovedì",
+                4: "venerdì",
+                5: "sabato",
+                6: "domenica",
             },
         },
         "months": {
@@ -140,6 +142,12 @@ locale = {
             "evening1": "di sera",
             "night1": "di notte",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/ko/__init__.py b/src/pendulum/locales/ja/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/ko/__init__.py
+++ b/src/pendulum/locales/ja/__init__.py
diff --git a/pendulum/locales/ja/custom.py b/src/pendulum/locales/ja/custom.py
index c076250..4cb5b95 100644
--- a/pendulum/locales/ja/custom.py
+++ b/src/pendulum/locales/ja/custom.py
@@ -1,6 +1,8 @@
 """
 ja custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     "units": {"few_second": "数秒"},
diff --git a/pendulum/locales/ja/locale.py b/src/pendulum/locales/ja/locale.py
index 574d2ec..a1d3bd9 100644
--- a/pendulum/locales/ja/locale.py
+++ b/src/pendulum/locales/ja/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.ja.custom import translations as custom_translations
 
 
 """
@@ -14,40 +16,40 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "日",
-                1: "月",
-                2: "火",
-                3: "水",
-                4: "木",
-                5: "金",
-                6: "土",
+                0: "月",
+                1: "火",
+                2: "水",
+                3: "木",
+                4: "金",
+                5: "土",
+                6: "日",
             },
             "narrow": {
-                0: "日",
-                1: "月",
-                2: "火",
-                3: "水",
-                4: "木",
-                5: "金",
-                6: "土",
+                0: "月",
+                1: "火",
+                2: "水",
+                3: "木",
+                4: "金",
+                5: "土",
+                6: "日",
             },
             "short": {
-                0: "日",
-                1: "月",
-                2: "火",
-                3: "水",
-                4: "木",
-                5: "金",
-                6: "土",
+                0: "月",
+                1: "火",
+                2: "水",
+                3: "木",
+                4: "金",
+                5: "土",
+                6: "日",
             },
             "wide": {
-                0: "日曜日",
-                1: "月曜日",
-                2: "火曜日",
-                3: "水曜日",
-                4: "木曜日",
-                5: "金曜日",
-                6: "土曜日",
+                0: "月曜日",
+                1: "火曜日",
+                2: "水曜日",
+                3: "木曜日",
+                4: "金曜日",
+                5: "土曜日",
+                6: "日曜日",
             },
         },
         "months": {
@@ -189,6 +191,12 @@ locale = {
             "night1": "夜",
             "night2": "夜中",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/lt/__init__.py b/src/pendulum/locales/ko/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/lt/__init__.py
+++ b/src/pendulum/locales/ko/__init__.py
diff --git a/pendulum/locales/ko/custom.py b/src/pendulum/locales/ko/custom.py
index 2c0e50c..b7476ff 100644
--- a/pendulum/locales/ko/custom.py
+++ b/src/pendulum/locales/ko/custom.py
@@ -1,6 +1,8 @@
 """
 ko custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     # Relative time
diff --git a/pendulum/locales/ko/locale.py b/src/pendulum/locales/ko/locale.py
index 0f5a346..b285dc0 100644
--- a/pendulum/locales/ko/locale.py
+++ b/src/pendulum/locales/ko/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.ko.custom import translations as custom_translations
 
 
 """
@@ -13,17 +15,17 @@ locale = {
     "ordinal": lambda n: "other",
     "translations": {
         "days": {
-            "abbreviated": {0: "일", 1: "월", 2: "화", 3: "수", 4: "목", 5: "금", 6: "토"},
-            "narrow": {0: "일", 1: "월", 2: "화", 3: "수", 4: "목", 5: "금", 6: "토"},
-            "short": {0: "일", 1: "월", 2: "화", 3: "수", 4: "목", 5: "금", 6: "토"},
+            "abbreviated": {0: "월", 1: "화", 2: "수", 3: "목", 4: "금", 5: "토", 6: "일"},
+            "narrow": {0: "월", 1: "화", 2: "수", 3: "목", 4: "금", 5: "토", 6: "일"},
+            "short": {0: "월", 1: "화", 2: "수", 3: "목", 4: "금", 5: "토", 6: "일"},
             "wide": {
-                0: "일요일",
-                1: "월요일",
-                2: "화요일",
-                3: "수요일",
-                4: "목요일",
-                5: "금요일",
-                6: "토요일",
+                0: "월요일",
+                1: "화요일",
+                2: "수요일",
+                3: "목요일",
+                4: "금요일",
+                5: "토요일",
+                6: "일요일",
             },
         },
         "months": {
@@ -100,6 +102,12 @@ locale = {
             "evening1": "저녁",
             "night1": "밤",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/locale.py b/src/pendulum/locales/locale.py
index 637509a..21eaaec 100644
--- a/pendulum/locales/locale.py
+++ b/src/pendulum/locales/locale.py
@@ -1,17 +1,15 @@
 from __future__ import annotations
 
+import re
+
 from importlib import import_module
 from pathlib import Path
-
-import re
-import sys
-from typing import Any, cast
+from typing import Any
+from typing import ClassVar
 from typing import Dict
+from typing import cast
 
-if sys.version_info >= (3, 9):
-    from importlib import resources
-else:
-    import importlib_resources as resources
+from pendulum.utils._compat import resources
 
 
 class Locale:
@@ -19,7 +17,7 @@ class Locale:
     Represent a specific locale.
     """
 
-    _cache: dict[str, Locale] = {}
+    _cache: ClassVar[dict[str, Locale]] = {}
 
     def __init__(self, locale: str, data: Any) -> None:
         self._locale: str = locale
diff --git a/pendulum/locales/nb/__init__.py b/src/pendulum/locales/lt/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/nb/__init__.py
+++ b/src/pendulum/locales/lt/__init__.py
diff --git a/pendulum/locales/lt/custom.py b/src/pendulum/locales/lt/custom.py
index 6480c31..d7f17d3 100644
--- a/pendulum/locales/lt/custom.py
+++ b/src/pendulum/locales/lt/custom.py
@@ -1,6 +1,8 @@
 """
 lt custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     # Relative time
diff --git a/pendulum/locales/lt/locale.py b/src/pendulum/locales/lt/locale.py
index fb017ef..6e9a460 100644
--- a/pendulum/locales/lt/locale.py
+++ b/src/pendulum/locales/lt/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.lt.custom import translations as custom_translations
 
 
 """
@@ -26,24 +28,24 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "sk",
-                1: "pr",
-                2: "an",
-                3: "tr",
-                4: "kt",
-                5: "pn",
-                6: "št",
-            },
-            "narrow": {0: "S", 1: "P", 2: "A", 3: "T", 4: "K", 5: "P", 6: "Š"},
-            "short": {0: "Sk", 1: "Pr", 2: "An", 3: "Tr", 4: "Kt", 5: "Pn", 6: "Št"},
+                0: "pr",
+                1: "an",
+                2: "tr",
+                3: "kt",
+                4: "pn",
+                5: "št",
+                6: "sk",
+            },
+            "narrow": {0: "P", 1: "A", 2: "T", 3: "K", 4: "P", 5: "Š", 6: "S"},
+            "short": {0: "Pr", 1: "An", 2: "Tr", 3: "Kt", 4: "Pn", 5: "Št", 6: "Sk"},
             "wide": {
-                0: "sekmadienis",
-                1: "pirmadienis",
-                2: "antradienis",
-                3: "trečiadienis",
-                4: "ketvirtadienis",
-                5: "penktadienis",
-                6: "šeštadienis",
+                0: "pirmadienis",
+                1: "antradienis",
+                2: "trečiadienis",
+                3: "ketvirtadienis",
+                4: "penktadienis",
+                5: "šeštadienis",
+                6: "sekmadienis",
             },
         },
         "months": {
@@ -250,6 +252,12 @@ locale = {
             "evening1": "vakaras",
             "night1": "naktis",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/nl/__init__.py b/src/pendulum/locales/nb/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/nl/__init__.py
+++ b/src/pendulum/locales/nb/__init__.py
diff --git a/pendulum/locales/nb/custom.py b/src/pendulum/locales/nb/custom.py
index 4c7cd6a..554e7f3 100644
--- a/pendulum/locales/nb/custom.py
+++ b/src/pendulum/locales/nb/custom.py
@@ -1,6 +1,8 @@
 """
 nn custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     # Relative time
diff --git a/pendulum/locales/nb/locale.py b/src/pendulum/locales/nb/locale.py
index c8297a8..084f019 100644
--- a/pendulum/locales/nb/locale.py
+++ b/src/pendulum/locales/nb/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.nb.custom import translations as custom_translations
 
 
 """
@@ -14,32 +16,32 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "søn.",
-                1: "man.",
-                2: "tir.",
-                3: "ons.",
-                4: "tor.",
-                5: "fre.",
-                6: "lør.",
+                0: "man.",
+                1: "tir.",
+                2: "ons.",
+                3: "tor.",
+                4: "fre.",
+                5: "lør.",
+                6: "søn.",
             },
-            "narrow": {0: "S", 1: "M", 2: "T", 3: "O", 4: "T", 5: "F", 6: "L"},
+            "narrow": {0: "M", 1: "T", 2: "O", 3: "T", 4: "F", 5: "L", 6: "S"},
             "short": {
-                0: "sø.",
-                1: "ma.",
-                2: "ti.",
-                3: "on.",
-                4: "to.",
-                5: "fr.",
-                6: "lø.",
+                0: "ma.",
+                1: "ti.",
+                2: "on.",
+                3: "to.",
+                4: "fr.",
+                5: "lø.",
+                6: "sø.",
             },
             "wide": {
-                0: "søndag",
-                1: "mandag",
-                2: "tirsdag",
-                3: "onsdag",
-                4: "torsdag",
-                5: "fredag",
-                6: "lørdag",
+                0: "mandag",
+                1: "tirsdag",
+                2: "onsdag",
+                3: "torsdag",
+                4: "fredag",
+                5: "lørdag",
+                6: "søndag",
             },
         },
         "months": {
@@ -145,6 +147,12 @@ locale = {
             "evening1": "kvelden",
             "night1": "natten",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/nn/__init__.py b/src/pendulum/locales/nl/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/nn/__init__.py
+++ b/src/pendulum/locales/nl/__init__.py
diff --git a/pendulum/locales/nl/custom.py b/src/pendulum/locales/nl/custom.py
index 2ca5a85..ca90673 100644
--- a/pendulum/locales/nl/custom.py
+++ b/src/pendulum/locales/nl/custom.py
@@ -1,6 +1,8 @@
 """
 nl custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     "units": {"few_second": "enkele seconden"},
diff --git a/pendulum/locales/nl/locale.py b/src/pendulum/locales/nl/locale.py
index cb1570d..68b54e7 100644
--- a/pendulum/locales/nl/locale.py
+++ b/src/pendulum/locales/nl/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.nl.custom import translations as custom_translations
 
 
 """
@@ -16,24 +18,24 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "zo",
-                1: "ma",
-                2: "di",
-                3: "wo",
-                4: "do",
-                5: "vr",
-                6: "za",
+                0: "ma",
+                1: "di",
+                2: "wo",
+                3: "do",
+                4: "vr",
+                5: "za",
+                6: "zo",
             },
-            "narrow": {0: "Z", 1: "M", 2: "D", 3: "W", 4: "D", 5: "V", 6: "Z"},
-            "short": {0: "zo", 1: "ma", 2: "di", 3: "wo", 4: "do", 5: "vr", 6: "za"},
+            "narrow": {0: "M", 1: "D", 2: "W", 3: "D", 4: "V", 5: "Z", 6: "Z"},
+            "short": {0: "ma", 1: "di", 2: "wo", 3: "do", 4: "vr", 5: "za", 6: "zo"},
             "wide": {
-                0: "zondag",
-                1: "maandag",
-                2: "dinsdag",
-                3: "woensdag",
-                4: "donderdag",
-                5: "vrijdag",
-                6: "zaterdag",
+                0: "maandag",
+                1: "dinsdag",
+                2: "woensdag",
+                3: "donderdag",
+                4: "vrijdag",
+                5: "zaterdag",
+                6: "zondag",
             },
         },
         "months": {
@@ -128,6 +130,12 @@ locale = {
             "afternoon1": "‘s middags",
             "evening1": "‘s avonds",
             "night1": "‘s nachts",
+            "week_data": {
+                "min_days": 1,
+                "first_day": 0,
+                "weekend_start": 5,
+                "weekend_end": 6,
+            },
         },
     },
     "custom": custom_translations,
diff --git a/pendulum/locales/pl/__init__.py b/src/pendulum/locales/nn/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/pl/__init__.py
+++ b/src/pendulum/locales/nn/__init__.py
diff --git a/pendulum/locales/nn/custom.py b/src/pendulum/locales/nn/custom.py
index 4c7cd6a..554e7f3 100644
--- a/pendulum/locales/nn/custom.py
+++ b/src/pendulum/locales/nn/custom.py
@@ -1,6 +1,8 @@
 """
 nn custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     # Relative time
diff --git a/pendulum/locales/nn/locale.py b/src/pendulum/locales/nn/locale.py
index eb46e1d..737ee6d 100644
--- a/pendulum/locales/nn/locale.py
+++ b/src/pendulum/locales/nn/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.nn.custom import translations as custom_translations
 
 
 """
@@ -14,32 +16,32 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "søn.",
-                1: "mån.",
-                2: "tys.",
-                3: "ons.",
-                4: "tor.",
-                5: "fre.",
-                6: "lau.",
+                0: "mån.",
+                1: "tys.",
+                2: "ons.",
+                3: "tor.",
+                4: "fre.",
+                5: "lau.",
+                6: "søn.",
             },
-            "narrow": {0: "S", 1: "M", 2: "T", 3: "O", 4: "T", 5: "F", 6: "L"},
+            "narrow": {0: "M", 1: "T", 2: "O", 3: "T", 4: "F", 5: "L", 6: "S"},
             "short": {
-                0: "sø.",
-                1: "må.",
-                2: "ty.",
-                3: "on.",
-                4: "to.",
-                5: "fr.",
-                6: "la.",
+                0: "må.",
+                1: "ty.",
+                2: "on.",
+                3: "to.",
+                4: "fr.",
+                5: "la.",
+                6: "sø.",
             },
             "wide": {
-                0: "søndag",
-                1: "måndag",
-                2: "tysdag",
-                3: "onsdag",
-                4: "torsdag",
-                5: "fredag",
-                6: "laurdag",
+                0: "måndag",
+                1: "tysdag",
+                2: "onsdag",
+                3: "torsdag",
+                4: "fredag",
+                5: "laurdag",
+                6: "søndag",
             },
         },
         "months": {
@@ -136,6 +138,12 @@ locale = {
             },
         },
         "day_periods": {"am": "formiddag", "pm": "ettermiddag"},
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/pt_br/__init__.py b/src/pendulum/locales/pl/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/pt_br/__init__.py
+++ b/src/pendulum/locales/pl/__init__.py
diff --git a/pendulum/locales/pl/custom.py b/src/pendulum/locales/pl/custom.py
index 9741b74..0aaab90 100644
--- a/pendulum/locales/pl/custom.py
+++ b/src/pendulum/locales/pl/custom.py
@@ -1,6 +1,8 @@
 """
 pl custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     "units": {"few_second": "kilka sekund"},
diff --git a/pendulum/locales/pl/locale.py b/src/pendulum/locales/pl/locale.py
index bf6af10..c709120 100644
--- a/pendulum/locales/pl/locale.py
+++ b/src/pendulum/locales/pl/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.pl.custom import translations as custom_translations
 
 
 """
@@ -41,32 +43,32 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "niedz.",
-                1: "pon.",
-                2: "wt.",
-                3: "śr.",
-                4: "czw.",
-                5: "pt.",
-                6: "sob.",
+                0: "pon.",
+                1: "wt.",
+                2: "śr.",
+                3: "czw.",
+                4: "pt.",
+                5: "sob.",
+                6: "niedz.",
             },
-            "narrow": {0: "n", 1: "p", 2: "w", 3: "ś", 4: "c", 5: "p", 6: "s"},
+            "narrow": {0: "p", 1: "w", 2: "ś", 3: "c", 4: "p", 5: "s", 6: "n"},
             "short": {
-                0: "nie",
-                1: "pon",
-                2: "wto",
-                3: "śro",
-                4: "czw",
-                5: "pią",
-                6: "sob",
+                0: "pon",
+                1: "wto",
+                2: "śro",
+                3: "czw",
+                4: "pią",
+                5: "sob",
+                6: "nie",
             },
             "wide": {
-                0: "niedziela",
-                1: "poniedziałek",
-                2: "wtorek",
-                3: "środa",
-                4: "czwartek",
-                5: "piątek",
-                6: "sobota",
+                0: "poniedziałek",
+                1: "wtorek",
+                2: "środa",
+                3: "czwartek",
+                4: "piątek",
+                5: "sobota",
+                6: "niedziela",
             },
         },
         "months": {
@@ -274,6 +276,12 @@ locale = {
             "evening1": "wieczorem",
             "night1": "w nocy",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/ru/__init__.py b/src/pendulum/locales/pt_br/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/ru/__init__.py
+++ b/src/pendulum/locales/pt_br/__init__.py
diff --git a/pendulum/locales/pt_br/custom.py b/src/pendulum/locales/pt_br/custom.py
index 12aced7..87a7702 100644
--- a/pendulum/locales/pt_br/custom.py
+++ b/src/pendulum/locales/pt_br/custom.py
@@ -1,6 +1,8 @@
 """
 pt-br custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     # Relative time
diff --git a/pendulum/locales/pt_br/locale.py b/src/pendulum/locales/pt_br/locale.py
index 742c41f..793cba8 100644
--- a/pendulum/locales/pt_br/locale.py
+++ b/src/pendulum/locales/pt_br/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.pt_br.custom import translations as custom_translations
 
 
 """
@@ -16,32 +18,32 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "dom",
-                1: "seg",
-                2: "ter",
-                3: "qua",
-                4: "qui",
-                5: "sex",
-                6: "sáb",
+                0: "seg",
+                1: "ter",
+                2: "qua",
+                3: "qui",
+                4: "sex",
+                5: "sáb",
+                6: "dom",
             },
-            "narrow": {0: "D", 1: "S", 2: "T", 3: "Q", 4: "Q", 5: "S", 6: "S"},
+            "narrow": {0: "S", 1: "T", 2: "Q", 3: "Q", 4: "S", 5: "S", 6: "D"},
             "short": {
-                0: "dom",
-                1: "seg",
-                2: "ter",
-                3: "qua",
-                4: "qui",
-                5: "sex",
-                6: "sáb",
+                0: "seg",
+                1: "ter",
+                2: "qua",
+                3: "qui",
+                4: "sex",
+                5: "sáb",
+                6: "dom",
             },
             "wide": {
-                0: "domingo",
-                1: "segunda-feira",
-                2: "terça-feira",
-                3: "quarta-feira",
-                4: "quinta-feira",
-                5: "sexta-feira",
-                6: "sábado",
+                0: "segunda-feira",
+                1: "terça-feira",
+                2: "quarta-feira",
+                3: "quinta-feira",
+                4: "sexta-feira",
+                5: "sábado",
+                6: "domingo",
             },
         },
         "months": {
@@ -138,6 +140,12 @@ locale = {
             "evening1": "da noite",
             "night1": "da madrugada",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 6,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/sk/__init__.py b/src/pendulum/locales/ru/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/sk/__init__.py
+++ b/src/pendulum/locales/ru/__init__.py
diff --git a/pendulum/locales/ru/custom.py b/src/pendulum/locales/ru/custom.py
index b4c89bb..e1f87ff 100644
--- a/pendulum/locales/ru/custom.py
+++ b/src/pendulum/locales/ru/custom.py
@@ -1,6 +1,8 @@
 """
 ru custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     # Relative time
diff --git a/pendulum/locales/ru/locale.py b/src/pendulum/locales/ru/locale.py
index 3736e0b..b9eab83 100644
--- a/pendulum/locales/ru/locale.py
+++ b/src/pendulum/locales/ru/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.ru.custom import translations as custom_translations
 
 
 """
@@ -41,24 +43,24 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "вс",
-                1: "пн",
-                2: "вт",
-                3: "ср",
-                4: "чт",
-                5: "пт",
-                6: "сб",
+                0: "пн",
+                1: "вт",
+                2: "ср",
+                3: "чт",
+                4: "пт",
+                5: "сб",
+                6: "вс",
             },
-            "narrow": {0: "вс", 1: "пн", 2: "вт", 3: "ср", 4: "чт", 5: "пт", 6: "сб"},
-            "short": {0: "вс", 1: "пн", 2: "вт", 3: "ср", 4: "чт", 5: "пт", 6: "сб"},
+            "narrow": {0: "пн", 1: "вт", 2: "ср", 3: "чт", 4: "пт", 5: "сб", 6: "вс"},
+            "short": {0: "пн", 1: "вт", 2: "ср", 3: "чт", 4: "пт", 5: "сб", 6: "вс"},
             "wide": {
-                0: "воскресенье",
-                1: "понедельник",
-                2: "вторник",
-                3: "среда",
-                4: "четверг",
-                5: "пятница",
-                6: "суббота",
+                0: "понедельник",
+                1: "вторник",
+                2: "среда",
+                3: "четверг",
+                4: "пятница",
+                5: "суббота",
+                6: "воскресенье",
             },
         },
         "months": {
@@ -265,6 +267,12 @@ locale = {
             "evening1": "вечера",
             "night1": "ночи",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/sv/__init__.py b/src/pendulum/locales/sk/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/sv/__init__.py
+++ b/src/pendulum/locales/sk/__init__.py
diff --git a/pendulum/locales/sk/custom.py b/src/pendulum/locales/sk/custom.py
index 71afb15..0059c11 100644
--- a/pendulum/locales/sk/custom.py
+++ b/src/pendulum/locales/sk/custom.py
@@ -1,6 +1,8 @@
 """
 sk custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     # Relative time
diff --git a/pendulum/locales/sk/locale.py b/src/pendulum/locales/sk/locale.py
index 8d3459f..530303f 100644
--- a/pendulum/locales/sk/locale.py
+++ b/src/pendulum/locales/sk/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.sk.custom import translations as custom_translations
 
 
 """
@@ -20,40 +22,40 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "ne",
-                1: "po",
-                2: "ut",
-                3: "st",
-                4: "št",
-                5: "pi",
-                6: "so",
+                0: "po",
+                1: "ut",
+                2: "st",
+                3: "št",
+                4: "pi",
+                5: "so",
+                6: "ne",
             },
             "narrow": {
-                0: "n",
-                1: "p",
-                2: "u",
-                3: "s",
-                4: "š",
-                5: "p",
-                6: "s",
+                0: "p",
+                1: "u",
+                2: "s",
+                3: "š",
+                4: "p",
+                5: "s",
+                6: "n",
             },
             "short": {
-                0: "ne",
-                1: "po",
-                2: "ut",
-                3: "st",
-                4: "št",
-                5: "pi",
-                6: "so",
+                0: "po",
+                1: "ut",
+                2: "st",
+                3: "št",
+                4: "pi",
+                5: "so",
+                6: "ne",
             },
             "wide": {
-                0: "nedeľa",
-                1: "pondelok",
-                2: "utorok",
-                3: "streda",
-                4: "štvrtok",
-                5: "piatok",
-                6: "sobota",
+                0: "pondelok",
+                1: "utorok",
+                2: "streda",
+                3: "štvrtok",
+                4: "piatok",
+                5: "sobota",
+                6: "nedeľa",
             },
         },
         "months": {
@@ -261,6 +263,12 @@ locale = {
             "evening1": "večer",
             "night1": "v noci",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/locales/zh/__init__.py b/src/pendulum/locales/sv/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/locales/zh/__init__.py
+++ b/src/pendulum/locales/sv/__init__.py
diff --git a/pendulum/locales/sv/custom.py b/src/pendulum/locales/sv/custom.py
index 7158f4b..83f36b1 100644
--- a/pendulum/locales/sv/custom.py
+++ b/src/pendulum/locales/sv/custom.py
@@ -1,6 +1,8 @@
 """
 sv custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     # Relative time
diff --git a/pendulum/locales/sv/locale.py b/src/pendulum/locales/sv/locale.py
index 5b74a6e..c3c4472 100644
--- a/pendulum/locales/sv/locale.py
+++ b/src/pendulum/locales/sv/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.sv.custom import translations as custom_translations
 
 
 """
@@ -21,40 +23,40 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "sön",
-                1: "mån",
-                2: "tis",
-                3: "ons",
-                4: "tors",
-                5: "fre",
-                6: "lör",
+                0: "mån",
+                1: "tis",
+                2: "ons",
+                3: "tors",
+                4: "fre",
+                5: "lör",
+                6: "sön",
             },
             "narrow": {
-                0: "S",
-                1: "M",
-                2: "T",
-                3: "O",
-                4: "T",
-                5: "F",
-                6: "L",
+                0: "M",
+                1: "T",
+                2: "O",
+                3: "T",
+                4: "F",
+                5: "L",
+                6: "S",
             },
             "short": {
-                0: "sö",
-                1: "må",
-                2: "ti",
-                3: "on",
-                4: "to",
-                5: "fr",
-                6: "lö",
+                0: "må",
+                1: "ti",
+                2: "on",
+                3: "to",
+                4: "fr",
+                5: "lö",
+                6: "sö",
             },
             "wide": {
-                0: "söndag",
-                1: "måndag",
-                2: "tisdag",
-                3: "onsdag",
-                4: "torsdag",
-                5: "fredag",
-                6: "lördag",
+                0: "måndag",
+                1: "tisdag",
+                2: "onsdag",
+                3: "torsdag",
+                4: "fredag",
+                5: "lördag",
+                6: "söndag",
             },
         },
         "months": {
@@ -217,6 +219,12 @@ locale = {
             "evening1": "på kvällen",
             "night1": "på natten",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/mixins/__init__.py b/src/pendulum/locales/tr/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/mixins/__init__.py
+++ b/src/pendulum/locales/tr/__init__.py
diff --git a/src/pendulum/locales/tr/custom.py b/src/pendulum/locales/tr/custom.py
new file mode 100644
index 0000000..b7fd3c7
--- /dev/null
+++ b/src/pendulum/locales/tr/custom.py
@@ -0,0 +1,24 @@
+"""
+tr custom locale file.
+"""
+from __future__ import annotations
+
+
+translations = {
+    # Relative time
+    "ago": "{} önce",
+    "from_now": "{} içinde",
+    "after": "{0} sonra",
+    "before": "{0} önce",
+    # Ordinals
+    "ordinal": {"one": ".", "two": ".", "few": ".", "other": "."},
+    # Date formats
+    "date_formats": {
+        "LTS": "h:mm:ss A",
+        "LT": "h:mm A",
+        "L": "MM/DD/YYYY",
+        "LL": "MMMM D, YYYY",
+        "LLL": "MMMM D, YYYY h:mm A",
+        "LLLL": "dddd, MMMM D, YYYY h:mm A",
+    },
+}
diff --git a/src/pendulum/locales/tr/locale.py b/src/pendulum/locales/tr/locale.py
new file mode 100644
index 0000000..f0233f2
--- /dev/null
+++ b/src/pendulum/locales/tr/locale.py
@@ -0,0 +1,225 @@
+from __future__ import annotations
+
+from pendulum.locales.tr.custom import translations as custom_translations
+
+
+"""
+tr locale file.
+
+It has been generated automatically and must not be modified directly.
+"""
+
+
+locale = {
+    "plural": lambda n: "one" if (n == n and (n == 1)) else "other",
+    "ordinal": lambda n: "other",
+    "translations": {
+        "days": {
+            "abbreviated": {
+                0: "Pzt",
+                1: "Sal",
+                2: "Çar",
+                3: "Per",
+                4: "Cum",
+                5: "Cmt",
+                6: "Paz",
+            },
+            "narrow": {
+                0: "P",
+                1: "S",
+                2: "Ç",
+                3: "P",
+                4: "C",
+                5: "C",
+                6: "P",
+            },
+            "short": {
+                0: "Pt",
+                1: "Sa",
+                2: "Ça",
+                3: "Pe",
+                4: "Cu",
+                5: "Ct",
+                6: "Pa",
+            },
+            "wide": {
+                0: "Pazartesi",
+                1: "Salı",
+                2: "Çarşamba",
+                3: "Perşembe",
+                4: "Cuma",
+                5: "Cumartesi",
+                6: "Pazar",
+            },
+        },
+        "months": {
+            "abbreviated": {
+                1: "Oca",
+                2: "Şub",
+                3: "Mar",
+                4: "Nis",
+                5: "May",
+                6: "Haz",
+                7: "Tem",
+                8: "Ağu",
+                9: "Eyl",
+                10: "Eki",
+                11: "Kas",
+                12: "Ara",
+            },
+            "narrow": {
+                1: "O",
+                2: "Ş",
+                3: "M",
+                4: "N",
+                5: "M",
+                6: "H",
+                7: "T",
+                8: "A",
+                9: "E",
+                10: "E",
+                11: "K",
+                12: "A",
+            },
+            "wide": {
+                1: "Ocak",
+                2: "Şubat",
+                3: "Mart",
+                4: "Nisan",
+                5: "Mayıs",
+                6: "Haziran",
+                7: "Temmuz",
+                8: "Ağustos",
+                9: "Eylül",
+                10: "Ekim",
+                11: "Kasım",
+                12: "Aralık",
+            },
+        },
+        "units": {
+            "year": {
+                "one": "{0} yıl",
+                "other": "{0} yıl",
+            },
+            "month": {
+                "one": "{0} ay",
+                "other": "{0} ay",
+            },
+            "week": {
+                "one": "{0} hafta",
+                "other": "{0} hafta",
+            },
+            "day": {
+                "one": "{0} gün",
+                "other": "{0} gün",
+            },
+            "hour": {
+                "one": "{0} saat",
+                "other": "{0} saat",
+            },
+            "minute": {
+                "one": "{0} dakika",
+                "other": "{0} dakika",
+            },
+            "second": {
+                "one": "{0} saniye",
+                "other": "{0} saniye",
+            },
+            "microsecond": {
+                "one": "{0} mikrosaniye",
+                "other": "{0} mikrosaniye",
+            },
+        },
+        "relative": {
+            "year": {
+                "future": {
+                    "other": "{0} yıl sonra",
+                    "one": "{0} yıl sonra",
+                },
+                "past": {
+                    "other": "{0} yıl önce",
+                    "one": "{0} yıl önce",
+                },
+            },
+            "month": {
+                "future": {
+                    "other": "{0} ay sonra",
+                    "one": "{0} ay sonra",
+                },
+                "past": {
+                    "other": "{0} ay önce",
+                    "one": "{0} ay önce",
+                },
+            },
+            "week": {
+                "future": {
+                    "other": "{0} hafta sonra",
+                    "one": "{0} hafta sonra",
+                },
+                "past": {
+                    "other": "{0} hafta önce",
+                    "one": "{0} hafta önce",
+                },
+            },
+            "day": {
+                "future": {
+                    "other": "{0} gün sonra",
+                    "one": "{0} gün sonra",
+                },
+                "past": {
+                    "other": "{0} gün önce",
+                    "one": "{0} gün önce",
+                },
+            },
+            "hour": {
+                "future": {
+                    "other": "{0} saat sonra",
+                    "one": "{0} saat sonra",
+                },
+                "past": {
+                    "other": "{0} saat önce",
+                    "one": "{0} saat önce",
+                },
+            },
+            "minute": {
+                "future": {
+                    "other": "{0} dakika sonra",
+                    "one": "{0} dakika sonra",
+                },
+                "past": {
+                    "other": "{0} dakika önce",
+                    "one": "{0} dakika önce",
+                },
+            },
+            "second": {
+                "future": {
+                    "other": "{0} saniye sonra",
+                    "one": "{0} saniye sonra",
+                },
+                "past": {
+                    "other": "{0} saniye önce",
+                    "one": "{0} saniye önce",
+                },
+            },
+        },
+        "day_periods": {
+            "midnight": "gece yarısı",
+            "am": "ÖÖ",
+            "noon": "öğle",
+            "pm": "ÖS",
+            "morning1": "sabah",
+            "morning2": "öğleden önce",
+            "afternoon1": "öğleden sonra",
+            "afternoon2": "akşamüstü",
+            "evening1": "akşam",
+            "night1": "gece",
+        },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
+    },
+    "custom": custom_translations,
+}
diff --git a/pendulum/testing/__init__.py b/src/pendulum/locales/zh/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/testing/__init__.py
+++ b/src/pendulum/locales/zh/__init__.py
diff --git a/pendulum/locales/zh/custom.py b/src/pendulum/locales/zh/custom.py
index 69bc4ca..cf47a40 100644
--- a/pendulum/locales/zh/custom.py
+++ b/src/pendulum/locales/zh/custom.py
@@ -1,6 +1,8 @@
 """
 zh custom locale file.
 """
+from __future__ import annotations
+
 
 translations = {
     # Relative time
diff --git a/pendulum/locales/zh/locale.py b/src/pendulum/locales/zh/locale.py
index 2df477f..eb85ab7 100644
--- a/pendulum/locales/zh/locale.py
+++ b/src/pendulum/locales/zh/locale.py
@@ -1,4 +1,6 @@
-from .custom import translations as custom_translations
+from __future__ import annotations
+
+from pendulum.locales.zh.custom import translations as custom_translations
 
 
 """
@@ -14,24 +16,24 @@ locale = {
     "translations": {
         "days": {
             "abbreviated": {
-                0: "周日",
-                1: "周一",
-                2: "周二",
-                3: "周三",
-                4: "周四",
-                5: "周五",
-                6: "周六",
+                0: "周一",
+                1: "周二",
+                2: "周三",
+                3: "周四",
+                4: "周五",
+                5: "周六",
+                6: "周日",
             },
-            "narrow": {0: "日", 1: "一", 2: "二", 3: "三", 4: "四", 5: "五", 6: "六"},
-            "short": {0: "周日", 1: "周一", 2: "周二", 3: "周三", 4: "周四", 5: "周五", 6: "周六"},
+            "narrow": {0: "一", 1: "二", 2: "三", 3: "四", 4: "五", 5: "六", 6: "日"},
+            "short": {0: "周一", 1: "周二", 2: "周三", 3: "周四", 4: "周五", 5: "周六", 6: "周日"},
             "wide": {
-                0: "星期日",
-                1: "星期一",
-                2: "星期二",
-                3: "星期三",
-                4: "星期四",
-                5: "星期五",
-                6: "星期六",
+                0: "星期一",
+                1: "星期二",
+                2: "星期三",
+                3: "星期四",
+                4: "星期五",
+                5: "星期六",
+                6: "星期日",
             },
         },
         "months": {
@@ -108,6 +110,12 @@ locale = {
             "evening1": "晚上",
             "night1": "凌晨",
         },
+        "week_data": {
+            "min_days": 1,
+            "first_day": 0,
+            "weekend_start": 5,
+            "weekend_end": 6,
+        },
     },
     "custom": custom_translations,
 }
diff --git a/pendulum/tz/data/__init__.py b/src/pendulum/mixins/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/tz/data/__init__.py
+++ b/src/pendulum/mixins/__init__.py
diff --git a/pendulum/mixins/default.py b/src/pendulum/mixins/default.py
index 59f985e..f2531f3 100644
--- a/pendulum/mixins/default.py
+++ b/src/pendulum/mixins/default.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 from pendulum.formatting import Formatter
 
+
 _formatter = Formatter()
 
 
@@ -21,7 +22,7 @@ class FormattableMixin:
         """
         Methods for automatic json serialization by simplejson.
         """
-        return str(self)
+        return self.isoformat()
 
     def __format__(self, format_spec: str) -> str:
         if len(format_spec) > 0:
diff --git a/pendulum/parser.py b/src/pendulum/parser.py
index 77900e2..5f9a0f7 100644
--- a/pendulum/parser.py
+++ b/src/pendulum/parser.py
@@ -5,21 +5,22 @@ import typing as t
 
 import pendulum
 
+from pendulum.duration import Duration
 from pendulum.parsing import _Interval
 from pendulum.parsing import parse as base_parse
 from pendulum.tz.timezone import UTC
 
+
 if t.TYPE_CHECKING:
     from pendulum.date import Date
     from pendulum.datetime import DateTime
-    from pendulum.duration import Duration
     from pendulum.interval import Interval
     from pendulum.time import Time
 
 try:
-    from pendulum.parsing._iso8601 import Duration as CDuration
+    from pendulum._pendulum import Duration as RustDuration
 except ImportError:
-    CDuration = None  # type: ignore[misc, assignment]
+    RustDuration = None  # type: ignore[assignment,misc]
 
 
 def parse(text: str, **options: t.Any) -> Date | Time | DateTime | Duration:
@@ -109,7 +110,10 @@ def _parse(text: str, **options: t.Any) -> Date | DateTime | Time | Duration | I
             ),
         )
 
-    if CDuration and isinstance(parsed, CDuration):
+    if isinstance(parsed, Duration):
+        return parsed
+
+    if RustDuration is not None and isinstance(parsed, RustDuration):
         return pendulum.duration(
             years=parsed.years,
             months=parsed.months,
@@ -121,4 +125,4 @@ def _parse(text: str, **options: t.Any) -> Date | DateTime | Time | Duration | I
             microseconds=parsed.microseconds,
         )
 
-    return parsed
+    raise NotImplementedError
diff --git a/pendulum/parsing/__init__.py b/src/pendulum/parsing/__init__.py
index 0e64065..761f52c 100644
--- a/pendulum/parsing/__init__.py
+++ b/src/pendulum/parsing/__init__.py
@@ -17,20 +17,22 @@ from dateutil import parser
 
 from pendulum.parsing.exceptions import ParserError
 
+
 with_extensions = os.getenv("PENDULUM_EXTENSIONS", "1") == "1"
 
 try:
     if not with_extensions or struct.calcsize("P") == 4:
         raise ImportError()
 
-    from pendulum.parsing._iso8601 import Duration
-    from pendulum.parsing._iso8601 import parse_iso8601
+    from pendulum._pendulum import Duration
+    from pendulum._pendulum import parse_iso8601
 except ImportError:
-    from pendulum.duration import Duration  # type: ignore[misc]
-    from pendulum.parsing.iso8601 import parse_iso8601  # type: ignore[misc]
+    from pendulum.duration import Duration  # type: ignore[assignment]
+    from pendulum.parsing.iso8601 import parse_iso8601  # type: ignore[assignment]
+
 
 COMMON = re.compile(
-    # Date (optional)  # noqa: E800
+    # Date (optional)  # noqa: ERA001
     "^"
     "(?P<date>"
     "    (?P<classic>"  # Classic date (YYYY-MM-DD)
@@ -41,10 +43,10 @@ COMMON = re.compile(
     "        )?"
     "    )"
     ")?"
-    # Time (optional)  # noqa: E800
-    "(?P<time>"
-    r"    (?P<timesep>\ )?"  # Separator (space)
-    r"    (?P<hour>\d{1,2}):(?P<minute>\d{1,2})?(?::(?P<second>\d{1,2}))?"  # HH:mm:ss (optional mm and ss)
+    # Time (optional)  # noqa: ERA001
+    "(?P<time>" r"    (?P<timesep>\ )?"  # Separator (space)
+    # HH:mm:ss (optional mm and ss)
+    r"    (?P<hour>\d{1,2}):(?P<minute>\d{1,2})?(?::(?P<second>\d{1,2}))?"
     # Subsecond part (optional)
     "    (?P<subsecondsection>"
     "        (?:[.|,])"  # Subsecond separator (optional)
@@ -173,10 +175,7 @@ def _parse_common(text: str, **options: Any) -> datetime | date | time:
 
     minute = int(m.group("minute"))
 
-    if m.group("second"):
-        second = int(m.group("second"))
-    else:
-        second = 0
+    second = int(m.group("second")) if m.group("second") else 0
 
     # Grabbing subseconds, if any
     microsecond = 0
@@ -231,3 +230,6 @@ def _parse_iso8601_interval(text: str) -> _Interval:
     return _Interval(
         cast(datetime, start), cast(datetime, end), cast(Duration, duration)
     )
+
+
+__all__ = ["parse", "parse_iso8601"]
diff --git a/pendulum/parsing/exceptions/__init__.py b/src/pendulum/parsing/exceptions/__init__.py
index 05195b5..9f2d809 100644
--- a/pendulum/parsing/exceptions/__init__.py
+++ b/src/pendulum/parsing/exceptions/__init__.py
@@ -2,5 +2,4 @@ from __future__ import annotations
 
 
 class ParserError(ValueError):
-
     pass
diff --git a/pendulum/parsing/iso8601.py b/src/pendulum/parsing/iso8601.py
index 907cf13..cc4dd7a 100644
--- a/pendulum/parsing/iso8601.py
+++ b/src/pendulum/parsing/iso8601.py
@@ -17,9 +17,11 @@ from pendulum.helpers import week_day
 from pendulum.parsing.exceptions import ParserError
 from pendulum.tz.timezone import UTC
 from pendulum.tz.timezone import FixedTimezone
+from pendulum.tz.timezone import Timezone
+
 
 ISO8601_DT = re.compile(
-    # Date (optional)  # noqa: E800
+    # Date (optional)  # noqa: ERA001
     "^"
     "(?P<date>"
     "    (?P<classic>"  # Classic date (YYYY-MM-DD) or ordinal (YYYY-DDD)
@@ -39,10 +41,10 @@ ISO8601_DT = re.compile(
     r"        (?P<isoweekday>\d)?"  # Weekday (optional)
     "    )"
     ")?"
-    # Time (optional)  # noqa: E800
-    "(?P<time>"
-    r"    (?P<timesep>[T\ ])?"  # Separator (T or space)
-    r"    (?P<hour>\d{1,2})(?P<minsep>:)?(?P<minute>\d{1,2})?(?P<secsep>:)?(?P<second>\d{1,2})?"  # HH:mm:ss (optional mm and ss)
+    # Time (optional)  # noqa: ERA001
+    "(?P<time>" r"    (?P<timesep>[T\ ])?"  # Separator (T or space)
+    # HH:mm:ss (optional mm and ss)
+    r"    (?P<hour>\d{1,2})(?P<minsep>:)?(?P<minute>\d{1,2})?(?P<secsep>:)?(?P<second>\d{1,2})?"  # noqa: E501
     # Subsecond part (optional)
     "    (?P<subsecondsection>"
     "        (?:[.,])"  # Subsecond separator (optional)
@@ -59,7 +61,7 @@ ISO8601_DT = re.compile(
 
 ISO8601_DURATION = re.compile(
     "^P"  # Duration P indicator
-    # Years, months and days (optional)  # noqa: E800
+    # Years, months and days (optional)  # noqa: ERA001
     "(?P<w>"
     r"    (?P<weeks>\d+(?:[.,]\d+)?W)"
     ")?"
@@ -107,7 +109,7 @@ def parse_iso8601(
     minute = 0
     second = 0
     microsecond = 0
-    tzinfo: FixedTimezone | None = None
+    tzinfo: FixedTimezone | Timezone | None = None
 
     if m.group("date"):
         # A date has been specified
@@ -183,7 +185,7 @@ def parse_iso8601(
         if ambiguous_date:
             # We can "safely" assume that the ambiguous date
             # was actually a time in the form hhmmss
-            hhmmss = f"{str(year)}{str(month):0>2}"
+            hhmmss = f"{year!s}{month!s:0>2}"
 
             return datetime.time(int(hhmmss[:2]), int(hhmmss[2:4]), int(hhmmss[4:]))
 
@@ -253,7 +255,7 @@ def parse_iso8601(
             tzinfo = FixedTimezone(offset)
 
     if is_time:
-        return datetime.time(hour, minute, second, microsecond)
+        return datetime.time(hour, minute, second, microsecond, tzinfo=tzinfo)
 
     return datetime.datetime(
         year, month, day, hour, minute, second, microsecond, tzinfo=tzinfo
@@ -418,10 +420,7 @@ def _parse_iso8601_duration(text: str, **options: str) -> Duration | None:
 def _get_iso_8601_week(
     year: int | str, week: int | str, weekday: int | str
 ) -> dict[str, int]:
-    if not weekday:
-        weekday = 1
-    else:
-        weekday = int(weekday)
+    weekday = 1 if not weekday else int(weekday)
 
     year = int(year)
     week = int(week)
diff --git a/pendulum/py.typed b/src/pendulum/py.typed
index e69de29..e69de29 100644
--- a/pendulum/py.typed
+++ b/src/pendulum/py.typed
diff --git a/pendulum/utils/__init__.py b/src/pendulum/testing/__init__.py
index e69de29..e69de29 100644
--- a/pendulum/utils/__init__.py
+++ b/src/pendulum/testing/__init__.py
diff --git a/src/pendulum/testing/traveller.py b/src/pendulum/testing/traveller.py
new file mode 100644
index 0000000..3ef3af4
--- /dev/null
+++ b/src/pendulum/testing/traveller.py
@@ -0,0 +1,172 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+from typing import cast
+
+from pendulum.datetime import DateTime
+from pendulum.utils._compat import PYPY
+
+
+if TYPE_CHECKING:
+    from types import TracebackType
+
+    from typing_extensions import Self
+
+
+class BaseTraveller:
+    def __init__(self, datetime_class: type[DateTime] = DateTime) -> None:
+        self._datetime_class: type[DateTime] = datetime_class
+
+    def freeze(self) -> Self:
+        raise self._not_implemented()
+
+    def travel_back(self) -> Self:
+        raise self._not_implemented()
+
+    def travel(
+        self,
+        years: int = 0,
+        months: int = 0,
+        weeks: int = 0,
+        days: int = 0,
+        hours: int = 0,
+        minutes: int = 0,
+        seconds: int = 0,
+        microseconds: int = 0,
+    ) -> Self:
+        raise self._not_implemented()
+
+    def travel_to(self, dt: DateTime, *, freeze: bool = False) -> Self:
+        raise self._not_implemented()
+
+    def __enter__(self) -> Self:
+        return self
+
+    def __exit__(
+        self,
+        exc_type: type[BaseException] | None,
+        exc_val: BaseException | None,
+        exc_tb: TracebackType,
+    ) -> None:
+        ...
+
+    def _not_implemented(self) -> NotImplementedError:
+        return NotImplementedError()
+
+
+if not PYPY:
+    try:
+        import time_machine
+    except ImportError:
+        time_machine = None  # type: ignore[assignment]
+
+    if time_machine is not None:
+
+        class Traveller(BaseTraveller):
+            def __init__(self, datetime_class: type[DateTime] = DateTime) -> None:
+                super().__init__(datetime_class)
+
+                self._started: bool = False
+                self._traveller: time_machine.travel | None = None
+                self._coordinates: time_machine.Coordinates | None = None
+
+            def freeze(self) -> Self:
+                if self._started:
+                    cast(time_machine.Coordinates, self._coordinates).move_to(
+                        self._datetime_class.now(), tick=False
+                    )
+                else:
+                    self._start(freeze=True)
+
+                return self
+
+            def travel_back(self) -> Self:
+                if not self._started:
+                    return self
+
+                cast(time_machine.travel, self._traveller).stop()
+                self._coordinates = None
+                self._traveller = None
+                self._started = False
+
+                return self
+
+            def travel(
+                self,
+                years: int = 0,
+                months: int = 0,
+                weeks: int = 0,
+                days: int = 0,
+                hours: int = 0,
+                minutes: int = 0,
+                seconds: int = 0,
+                microseconds: int = 0,
+                *,
+                freeze: bool = False,
+            ) -> Self:
+                self._start(freeze=freeze)
+
+                cast(time_machine.Coordinates, self._coordinates).move_to(
+                    self._datetime_class.now().add(
+                        years=years,
+                        months=months,
+                        weeks=weeks,
+                        days=days,
+                        hours=hours,
+                        minutes=minutes,
+                        seconds=seconds,
+                        microseconds=microseconds,
+                    )
+                )
+
+                return self
+
+            def travel_to(self, dt: DateTime, *, freeze: bool = False) -> Self:
+                self._start(freeze=freeze)
+
+                cast(time_machine.Coordinates, self._coordinates).move_to(dt)
+
+                return self
+
+            def _start(self, freeze: bool = False) -> None:
+                if self._started:
+                    return
+
+                if not self._traveller:
+                    self._traveller = time_machine.travel(
+                        self._datetime_class.now(), tick=not freeze
+                    )
+
+                self._coordinates = self._traveller.start()
+
+                self._started = True
+
+            def __enter__(self) -> Self:
+                self._start()
+
+                return self
+
+            def __exit__(
+                self,
+                exc_type: type[BaseException] | None,
+                exc_val: BaseException | None,
+                exc_tb: TracebackType,
+            ) -> None:
+                self.travel_back()
+
+    else:
+
+        class Traveller(BaseTraveller):  # type: ignore[no-redef]
+            def _not_implemented(self) -> NotImplementedError:
+                return NotImplementedError(
+                    "Time travelling is an optional feature. "
+                    'You can add it by installing Pendulum with the "test" extra.'
+                )
+
+else:
+
+    class Traveller(BaseTraveller):  # type: ignore[no-redef]
+        def _not_implemented(self) -> NotImplementedError:
+            return NotImplementedError(
+                "Time travelling is not supported on the PyPy Python implementation."
+            )
diff --git a/pendulum/time.py b/src/pendulum/time.py
index f979e25..23c79c0 100644
--- a/pendulum/time.py
+++ b/src/pendulum/time.py
@@ -17,9 +17,16 @@ from pendulum.constants import USECS_PER_SEC
 from pendulum.duration import AbsoluteDuration
 from pendulum.duration import Duration
 from pendulum.mixins.default import FormattableMixin
+from pendulum.tz.timezone import UTC
+
 
 if TYPE_CHECKING:
-    from typing import Literal
+    from typing_extensions import Literal
+    from typing_extensions import Self
+    from typing_extensions import SupportsIndex
+
+    from pendulum.tz.timezone import FixedTimezone
+    from pendulum.tz.timezone import Timezone
 
 
 class Time(FormattableMixin, time):
@@ -27,6 +34,17 @@ class Time(FormattableMixin, time):
     Represents a time instance as hour, minute, second, microsecond.
     """
 
+    @classmethod
+    def instance(
+        cls, t: time, tz: str | Timezone | FixedTimezone | datetime.tzinfo | None = UTC
+    ) -> Self:
+        tz = t.tzinfo or tz
+
+        if tz is not None:
+            tz = pendulum._safe_timezone(tz)
+
+        return cls(t.hour, t.minute, t.second, t.microsecond, tzinfo=tz, fold=t.fold)
+
     # String formatting
     def __repr__(self) -> str:
         us = ""
@@ -35,7 +53,7 @@ class Time(FormattableMixin, time):
 
         tzinfo = ""
         if self.tzinfo:
-            tzinfo = f", tzinfo={repr(self.tzinfo)}"
+            tzinfo = f", tzinfo={self.tzinfo!r}"
 
         return (
             f"{self.__class__.__name__}"
@@ -44,7 +62,7 @@ class Time(FormattableMixin, time):
 
     # Comparisons
 
-    def closest(self, dt1: Time | time, dt2: Time | time) -> Time:
+    def closest(self, dt1: Time | time, dt2: Time | time) -> Self:
         """
         Get the closest time from the instance.
         """
@@ -56,7 +74,7 @@ class Time(FormattableMixin, time):
 
         return dt2
 
-    def farthest(self, dt1: Time | time, dt2: Time | time) -> Time:
+    def farthest(self, dt1: Time | time, dt2: Time | time) -> Self:
         """
         Get the farthest time from the instance.
         """
@@ -250,13 +268,13 @@ class Time(FormattableMixin, time):
 
     def replace(
         self,
-        hour: int | None = None,
-        minute: int | None = None,
-        second: int | None = None,
-        microsecond: int | None = None,
+        hour: SupportsIndex | None = None,
+        minute: SupportsIndex | None = None,
+        second: SupportsIndex | None = None,
+        microsecond: SupportsIndex | None = None,
         tzinfo: bool | datetime.tzinfo | Literal[True] | None = True,
         fold: int = 0,
-    ) -> Time:
+    ) -> Self:
         if tzinfo is True:
             tzinfo = self.tzinfo
 
@@ -281,7 +299,7 @@ class Time(FormattableMixin, time):
         return (self,)
 
     def _get_state(
-        self, protocol: int = 3
+        self, protocol: SupportsIndex = 3
     ) -> tuple[int, int, int, int, datetime.tzinfo | None]:
         tz = self.tzinfo
 
@@ -292,8 +310,8 @@ class Time(FormattableMixin, time):
     ) -> tuple[type[Time], tuple[int, int, int, int, datetime.tzinfo | None]]:
         return self.__reduce_ex__(2)
 
-    def __reduce_ex__(  # type: ignore[override]
-        self, protocol: int
+    def __reduce_ex__(
+        self, protocol: SupportsIndex
     ) -> tuple[type[Time], tuple[int, int, int, int, datetime.tzinfo | None]]:
         return self.__class__, self._get_state(protocol)
 
diff --git a/pendulum/tz/__init__.py b/src/pendulum/tz/__init__.py
index 45c9855..36c2c69 100644
--- a/pendulum/tz/__init__.py
+++ b/src/pendulum/tz/__init__.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
-import sys
+from pathlib import Path
+from typing import cast
 
 from pendulum.tz.local_timezone import get_local_timezone
 from pendulum.tz.local_timezone import set_local_timezone
@@ -8,11 +9,8 @@ from pendulum.tz.local_timezone import test_local_timezone
 from pendulum.tz.timezone import UTC
 from pendulum.tz.timezone import FixedTimezone
 from pendulum.tz.timezone import Timezone
+from pendulum.utils._compat import resources
 
-if sys.version_info >= (3, 9):
-    from importlib import resources
-else:
-    import importlib_resources as resources
 
 PRE_TRANSITION = "pre"
 POST_TRANSITION = "post"
@@ -27,25 +25,12 @@ def timezones() -> tuple[str, ...]:
     global _timezones
 
     if _timezones is None:
-        with resources.files("tzdata").joinpath("zones").open() as f:
+        with cast(Path, resources.files("tzdata").joinpath("zones")).open() as f:
             _timezones = tuple(tz.strip() for tz in f.readlines())
 
     return _timezones
 
 
-def timezone(name: str | int) -> Timezone | FixedTimezone:
-    """
-    Return a Timezone instance given its name.
-    """
-    if isinstance(name, int):
-        return fixed_timezone(name)
-
-    if name.lower() == "utc":
-        return UTC
-
-    return Timezone(name)
-
-
 def fixed_timezone(offset: int) -> FixedTimezone:
     """
     Return a Timezone instance given its offset in seconds.
@@ -73,7 +58,6 @@ __all__ = [
     "set_local_timezone",
     "get_local_timezone",
     "test_local_timezone",
-    "timezone",
     "fixed_timezone",
     "local_timezone",
     "timezones",
diff --git a/src/pendulum/tz/data/__init__.py b/src/pendulum/tz/data/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/pendulum/tz/data/__init__.py
diff --git a/pendulum/tz/data/windows.py b/src/pendulum/tz/data/windows.py
index 65aa6c3..e76e6bb 100644
--- a/pendulum/tz/data/windows.py
+++ b/src/pendulum/tz/data/windows.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+
 windows_timezones = {
     "AUS Central Standard Time": "Australia/Darwin",
     "AUS Eastern Standard Time": "Australia/Sydney",
diff --git a/pendulum/tz/exceptions.py b/src/pendulum/tz/exceptions.py
index b8833ac..d06c133 100644
--- a/pendulum/tz/exceptions.py
+++ b/src/pendulum/tz/exceptions.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 from typing import TYPE_CHECKING
 
+
 if TYPE_CHECKING:
     from datetime import datetime
 
diff --git a/pendulum/tz/local_timezone.py b/src/pendulum/tz/local_timezone.py
index 41cf81b..3cb488c 100644
--- a/pendulum/tz/local_timezone.py
+++ b/src/pendulum/tz/local_timezone.py
@@ -4,20 +4,20 @@ import contextlib
 import os
 import re
 import sys
+import warnings
 
 from contextlib import contextmanager
 from typing import Iterator
 from typing import cast
 
 from pendulum.tz.exceptions import InvalidTimezone
+from pendulum.tz.timezone import UTC
 from pendulum.tz.timezone import FixedTimezone
 from pendulum.tz.timezone import Timezone
 
+
 if sys.platform == "win32":
-    try:
-        import _winreg as winreg
-    except (ImportError, AttributeError):
-        import winreg
+    import winreg
 
 _mock_local_timezone = None
 _local_timezone = None
@@ -142,7 +142,7 @@ if sys.platform == "win32":
 else:
 
     def _get_windows_timezone() -> Timezone:
-        ...
+        raise NotImplementedError
 
 
 def _get_darwin_timezone() -> Timezone:
@@ -239,9 +239,13 @@ def _get_unix_timezone(_root: str = "/") -> Timezone:
             continue
 
         with open(tzpath, "rb") as f:
-            return cast(Timezone, Timezone.from_file(f))
+            return Timezone.from_file(f)
+
+    warnings.warn(
+        "Unable not find any timezone configuration, defaulting to UTC.", stacklevel=1
+    )
 
-    raise RuntimeError("Unable to find any timezone configuration")
+    return UTC
 
 
 def _tz_from_env(tzenv: str) -> Timezone:
@@ -251,7 +255,7 @@ def _tz_from_env(tzenv: str) -> Timezone:
     # TZ specifies a file
     if os.path.isfile(tzenv):
         with open(tzenv, "rb") as f:
-            return cast(Timezone, Timezone.from_file(f))
+            return Timezone.from_file(f)
 
     # TZ specifies a zoneinfo zone.
     try:
diff --git a/pendulum/tz/timezone.py b/src/pendulum/tz/timezone.py
index f689004..0c6eb8d 100644
--- a/pendulum/tz/timezone.py
+++ b/src/pendulum/tz/timezone.py
@@ -1,9 +1,12 @@
+# mypy: no-warn-redundant-casts
 from __future__ import annotations
 
-import datetime as datetime_
+import datetime as _datetime
 
 from abc import ABC
 from abc import abstractmethod
+from typing import TYPE_CHECKING
+from typing import TypeVar
 from typing import cast
 
 from pendulum.tz.exceptions import AmbiguousTime
@@ -11,11 +14,18 @@ from pendulum.tz.exceptions import InvalidTimezone
 from pendulum.tz.exceptions import NonExistingTime
 from pendulum.utils._compat import zoneinfo
 
+
+if TYPE_CHECKING:
+    from typing_extensions import Self
+
 POST_TRANSITION = "post"
 PRE_TRANSITION = "pre"
 TRANSITION_ERROR = "error"
 
 
+_DT = TypeVar("_DT", bound=_datetime.datetime)
+
+
 class PendulumTimezone(ABC):
     @property
     @abstractmethod
@@ -23,9 +33,7 @@ class PendulumTimezone(ABC):
         raise NotImplementedError
 
     @abstractmethod
-    def convert(
-        self, dt: datetime_.datetime, raise_on_unknown_times: bool = False
-    ) -> datetime_.datetime:
+    def convert(self, dt: _DT, raise_on_unknown_times: bool = False) -> _DT:
         raise NotImplementedError
 
     @abstractmethod
@@ -38,11 +46,11 @@ class PendulumTimezone(ABC):
         minute: int = 0,
         second: int = 0,
         microsecond: int = 0,
-    ) -> datetime_.datetime:
+    ) -> _datetime.datetime:
         raise NotImplementedError
 
 
-class Timezone(zoneinfo.ZoneInfo, PendulumTimezone):  # type: ignore[misc]
+class Timezone(zoneinfo.ZoneInfo, PendulumTimezone):
     """
     Represents a named timezone.
 
@@ -52,19 +60,17 @@ class Timezone(zoneinfo.ZoneInfo, PendulumTimezone):  # type: ignore[misc]
     >>> tz = Timezone('Europe/Paris')
     """
 
-    def __new__(cls, key: str) -> Timezone:
+    def __new__(cls, key: str) -> Self:
         try:
-            return cast(Timezone, super().__new__(cls, key))
+            return super().__new__(cls, key)  # type: ignore[call-arg]
         except zoneinfo.ZoneInfoNotFoundError:
             raise InvalidTimezone(key)
 
     @property
     def name(self) -> str:
-        return cast(str, self.key)
+        return self.key
 
-    def convert(
-        self, dt: datetime_.datetime, raise_on_unknown_times: bool = False
-    ) -> datetime_.datetime:
+    def convert(self, dt: _DT, raise_on_unknown_times: bool = False) -> _DT:
         """
         Converts a datetime in the current timezone.
 
@@ -85,12 +91,26 @@ class Timezone(zoneinfo.ZoneInfo, PendulumTimezone):  # type: ignore[misc]
         >>> in_new_york.isoformat()
         '2013-03-30T21:30:00-04:00'
         """
+
         if dt.tzinfo is None:
-            offset_before = (
-                self.utcoffset(dt.replace(fold=0)) if dt.fold else self.utcoffset(dt)
+            # Technically, utcoffset() can return None, but none of the zone information
+            # in tzdata sets _tti_before to None. This can be checked with the following
+            # code:
+            #
+            # >>> import zoneinfo
+            # >>> from zoneinfo._zoneinfo import ZoneInfo
+            #
+            # >>> for tzname in zoneinfo.available_timezones():
+            # >>>     if ZoneInfo(tzname)._tti_before is None:
+            # >>>         print(tzname)
+
+            offset_before = cast(
+                _datetime.timedelta,
+                (self.utcoffset(dt.replace(fold=0)) if dt.fold else self.utcoffset(dt)),
             )
-            offset_after = (
-                self.utcoffset(dt) if dt.fold else self.utcoffset(dt.replace(fold=1))
+            offset_after = cast(
+                _datetime.timedelta,
+                (self.utcoffset(dt) if dt.fold else self.utcoffset(dt.replace(fold=1))),
             )
 
             if offset_after > offset_before:
@@ -98,10 +118,14 @@ class Timezone(zoneinfo.ZoneInfo, PendulumTimezone):  # type: ignore[misc]
                 if raise_on_unknown_times:
                     raise NonExistingTime(dt)
 
-                dt += (
-                    (offset_after - offset_before)
-                    if dt.fold
-                    else (offset_before - offset_after)
+                dt = cast(
+                    _DT,
+                    dt
+                    + (
+                        (offset_after - offset_before)
+                        if dt.fold
+                        else (offset_before - offset_after)
+                    ),
                 )
             elif offset_before > offset_after and raise_on_unknown_times:
                 # Repeated time
@@ -109,7 +133,7 @@ class Timezone(zoneinfo.ZoneInfo, PendulumTimezone):  # type: ignore[misc]
 
             return dt.replace(tzinfo=self)
 
-        return dt.astimezone(self)
+        return cast(_DT, dt.astimezone(self))
 
     def datetime(
         self,
@@ -120,12 +144,12 @@ class Timezone(zoneinfo.ZoneInfo, PendulumTimezone):  # type: ignore[misc]
         minute: int = 0,
         second: int = 0,
         microsecond: int = 0,
-    ) -> datetime_.datetime:
+    ) -> _datetime.datetime:
         """
         Return a normalized datetime for the current timezone.
         """
         return self.convert(
-            datetime_.datetime(
+            _datetime.datetime(
                 year, month, day, hour, minute, second, microsecond, fold=1
             )
         )
@@ -134,7 +158,7 @@ class Timezone(zoneinfo.ZoneInfo, PendulumTimezone):  # type: ignore[misc]
         return f"{self.__class__.__name__}('{self.name}')"
 
 
-class FixedTimezone(datetime_.tzinfo, PendulumTimezone):
+class FixedTimezone(_datetime.tzinfo, PendulumTimezone):
     def __init__(self, offset: int, name: str | None = None) -> None:
         sign = "-" if offset < 0 else "+"
 
@@ -146,15 +170,13 @@ class FixedTimezone(datetime_.tzinfo, PendulumTimezone):
 
         self._name = name
         self._offset = offset
-        self._utcoffset = datetime_.timedelta(seconds=offset)
+        self._utcoffset = _datetime.timedelta(seconds=offset)
 
     @property
     def name(self) -> str:
         return self._name
 
-    def convert(
-        self, dt: datetime_.datetime, raise_on_unknown_times: bool = False
-    ) -> datetime_.datetime:
+    def convert(self, dt: _DT, raise_on_unknown_times: bool = False) -> _DT:
         if dt.tzinfo is None:
             return dt.__class__(
                 dt.year,
@@ -168,7 +190,7 @@ class FixedTimezone(datetime_.tzinfo, PendulumTimezone):
                 fold=0,
             )
 
-        return dt.astimezone(self)
+        return cast(_DT, dt.astimezone(self))
 
     def datetime(
         self,
@@ -179,9 +201,9 @@ class FixedTimezone(datetime_.tzinfo, PendulumTimezone):
         minute: int = 0,
         second: int = 0,
         microsecond: int = 0,
-    ) -> datetime_.datetime:
+    ) -> _datetime.datetime:
         return self.convert(
-            datetime_.datetime(
+            _datetime.datetime(
                 year, month, day, hour, minute, second, microsecond, fold=1
             )
         )
@@ -190,17 +212,17 @@ class FixedTimezone(datetime_.tzinfo, PendulumTimezone):
     def offset(self) -> int:
         return self._offset
 
-    def utcoffset(self, dt: datetime_.datetime | None) -> datetime_.timedelta:
+    def utcoffset(self, dt: _datetime.datetime | None) -> _datetime.timedelta:
         return self._utcoffset
 
-    def dst(self, dt: datetime_.datetime | None) -> datetime_.timedelta:
-        return datetime_.timedelta()
+    def dst(self, dt: _datetime.datetime | None) -> _datetime.timedelta:
+        return _datetime.timedelta()
 
-    def fromutc(self, dt: datetime_.datetime) -> datetime_.datetime:
+    def fromutc(self, dt: _datetime.datetime) -> _datetime.datetime:
         # Use the stdlib datetime's add method to avoid infinite recursion
-        return (datetime_.datetime.__add__(dt, self._utcoffset)).replace(tzinfo=self)
+        return (_datetime.datetime.__add__(dt, self._utcoffset)).replace(tzinfo=self)
 
-    def tzname(self, dt: datetime_.datetime | None) -> str | None:
+    def tzname(self, dt: _datetime.datetime | None) -> str | None:
         return self._name
 
     def __getinitargs__(self) -> tuple[int, str]:
diff --git a/src/pendulum/utils/__init__.py b/src/pendulum/utils/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/pendulum/utils/__init__.py
diff --git a/src/pendulum/utils/_compat.py b/src/pendulum/utils/_compat.py
new file mode 100644
index 0000000..e4dfedf
--- /dev/null
+++ b/src/pendulum/utils/_compat.py
@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+import sys
+
+from pendulum.utils import _zoneinfo as zoneinfo
+
+
+PYPY = hasattr(sys, "pypy_version_info")
+
+if sys.version_info < (3, 9):
+    import importlib_resources as resources
+else:
+    from importlib import resources
+
+__all__ = ["resources", "zoneinfo"]
diff --git a/src/pendulum/utils/_zoneinfo.py b/src/pendulum/utils/_zoneinfo.py
new file mode 100644
index 0000000..e9f0251
--- /dev/null
+++ b/src/pendulum/utils/_zoneinfo.py
@@ -0,0 +1,80 @@
+from __future__ import annotations
+
+import sys
+
+from typing import TYPE_CHECKING
+
+
+if sys.version_info < (3, 9):
+    # Works around https://github.com/pganssle/zoneinfo/issues/125
+    from backports.zoneinfo import TZPATH
+    from backports.zoneinfo import InvalidTZPathWarning
+    from backports.zoneinfo import ZoneInfoNotFoundError
+    from backports.zoneinfo import available_timezones
+    from backports.zoneinfo import reset_tzpath
+
+    if TYPE_CHECKING:
+        from collections.abc import Iterable
+        from datetime import datetime
+        from datetime import timedelta
+        from datetime import tzinfo
+        from typing import Any
+        from typing import Protocol
+
+        from typing_extensions import Self
+
+        class _IOBytes(Protocol):
+            def read(self, __size: int) -> bytes:
+                ...
+
+            def seek(self, __size: int, __whence: int = ...) -> Any:
+                ...
+
+        class ZoneInfo(tzinfo):
+            @property
+            def key(self) -> str:
+                ...
+
+            def __init__(self, key: str) -> None:
+                ...
+
+            @classmethod
+            def no_cache(cls, key: str) -> Self:
+                ...
+
+            @classmethod
+            def from_file(cls, __fobj: _IOBytes, key: str | None = ...) -> Self:
+                ...
+
+            @classmethod
+            def clear_cache(cls, *, only_keys: Iterable[str] | None = ...) -> None:
+                ...
+
+            def tzname(self, __dt: datetime | None) -> str | None:
+                ...
+
+            def utcoffset(self, __dt: datetime | None) -> timedelta | None:
+                ...
+
+            def dst(self, __dt: datetime | None) -> timedelta | None:
+                ...
+
+    else:
+        from backports.zoneinfo import ZoneInfo
+
+else:
+    from zoneinfo import TZPATH
+    from zoneinfo import InvalidTZPathWarning
+    from zoneinfo import ZoneInfo
+    from zoneinfo import ZoneInfoNotFoundError
+    from zoneinfo import available_timezones
+    from zoneinfo import reset_tzpath
+
+__all__ = [
+    "ZoneInfo",
+    "reset_tzpath",
+    "available_timezones",
+    "TZPATH",
+    "ZoneInfoNotFoundError",
+    "InvalidTZPathWarning",
+]
diff --git a/tests/benchmarks/__init__.py b/tests/benchmarks/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/benchmarks/__init__.py
diff --git a/tests/benchmarks/test_parse_8601.py b/tests/benchmarks/test_parse_8601.py
new file mode 100644
index 0000000..1f838a8
--- /dev/null
+++ b/tests/benchmarks/test_parse_8601.py
@@ -0,0 +1,51 @@
+from __future__ import annotations
+
+import pytest
+
+from pendulum.parsing.iso8601 import parse_iso8601
+
+
+@pytest.mark.benchmark(group="Parsing")
+def test_parse_iso8601() -> None:
+    # Date
+    parse_iso8601("2016")
+    parse_iso8601("2016-10")
+    parse_iso8601("2016-10-06")
+    parse_iso8601("20161006")
+
+    # Time
+    parse_iso8601("201610")
+
+    # Datetime
+    parse_iso8601("2016-10-06T12:34:56.123456")
+    parse_iso8601("2016-10-06T12:34:56.123")
+    parse_iso8601("2016-10-06T12:34:56.000123")
+    parse_iso8601("2016-10-06T12")
+    parse_iso8601("2016-10-06T123456")
+    parse_iso8601("2016-10-06T123456.123456")
+    parse_iso8601("20161006T123456.123456")
+    parse_iso8601("20161006 123456.123456")
+
+    # Datetime with offset
+    parse_iso8601("2016-10-06T12:34:56.123456+05:30")
+    parse_iso8601("2016-10-06T12:34:56.123456+0530")
+    parse_iso8601("2016-10-06T12:34:56.123456-05:30")
+    parse_iso8601("2016-10-06T12:34:56.123456-0530")
+    parse_iso8601("2016-10-06T12:34:56.123456+05")
+    parse_iso8601("2016-10-06T12:34:56.123456-05")
+    parse_iso8601("20161006T123456,123456-05")
+    parse_iso8601("2016-10-06T12:34:56.123456789+05:30")
+
+    # Ordinal date
+    parse_iso8601("2012-007")
+    parse_iso8601("2012007")
+    parse_iso8601("2017-079")
+
+    # Week date
+    parse_iso8601("2012-W05")
+    parse_iso8601("2008-W39-6")
+    parse_iso8601("2009-W53-7")
+    parse_iso8601("2009-W01-1")
+
+    # Week date wth time
+    parse_iso8601("2008-W39-6T09")
diff --git a/tests/conftest.py b/tests/conftest.py
index 060e951..99f4b93 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,25 +1,38 @@
 from __future__ import annotations
 
+from typing import TYPE_CHECKING
+
 import pytest
 
 import pendulum
 
 
+if TYPE_CHECKING:
+    from collections.abc import Iterator
+
+
 @pytest.fixture(autouse=True)
-def setup():
+def setup() -> Iterator[None]:
     pendulum.set_local_timezone(pendulum.timezone("America/Toronto"))
 
     yield
 
     pendulum.set_locale("en")
     pendulum.set_local_timezone()
-    pendulum.week_starts_at(pendulum.MONDAY)
-    pendulum.week_ends_at(pendulum.SUNDAY)
+    pendulum.week_starts_at(pendulum.WeekDay.MONDAY)
+    pendulum.week_ends_at(pendulum.WeekDay.SUNDAY)
 
 
 def assert_datetime(
-    d, year, month, day, hour=None, minute=None, second=None, microsecond=None
-):
+    d: pendulum.DateTime,
+    year: int,
+    month: int,
+    day: int,
+    hour: int | None = None,
+    minute: int | None = None,
+    second: int | None = None,
+    microsecond: int | None = None,
+) -> None:
     assert year == d.year
     assert month == d.month
     assert day == d.day
@@ -37,13 +50,19 @@ def assert_datetime(
         assert microsecond == d.microsecond
 
 
-def assert_date(d, year, month, day):
+def assert_date(d: pendulum.Date, year: int, month: int, day: int) -> None:
     assert year == d.year
     assert month == d.month
     assert day == d.day
 
 
-def assert_time(t, hour, minute, second, microsecond=None):
+def assert_time(
+    t: pendulum.Time,
+    hour: int,
+    minute: int,
+    second: int,
+    microsecond: int | None = None,
+) -> None:
     assert hour == t.hour
     assert minute == t.minute
     assert second == t.second
@@ -53,15 +72,15 @@ def assert_time(t, hour, minute, second, microsecond=None):
 
 
 def assert_duration(
-    dur,
-    years=None,
-    months=None,
-    weeks=None,
-    days=None,
-    hours=None,
-    minutes=None,
-    seconds=None,
-    microseconds=None,
+    dur: pendulum.Duration,
+    years: int | None = None,
+    months: int | None = None,
+    weeks: int | None = None,
+    days: int | None = None,
+    hours: int | None = None,
+    minutes: int | None = None,
+    seconds: int | None = None,
+    microseconds: int | None = None,
 ) -> None:
     expected = {}
     actual = {}
diff --git a/tests/date/test_comparison.py b/tests/date/test_comparison.py
index 94bf224..9fd999b 100644
--- a/tests/date/test_comparison.py
+++ b/tests/date/test_comparison.py
@@ -46,7 +46,7 @@ def test_not_equal_to_false():
 def test_not_equal_to_none():
     d1 = pendulum.Date(2000, 1, 1)
 
-    assert d1 != None  # noqa
+    assert d1 is not None
 
 
 def test_greater_than_true():
diff --git a/tests/date/test_day_of_week_modifiers.py b/tests/date/test_day_of_week_modifiers.py
index 55aba55..0363096 100644
--- a/tests/date/test_day_of_week_modifiers.py
+++ b/tests/date/test_day_of_week_modifiers.py
@@ -49,7 +49,7 @@ def test_next_monday():
 
 
 def test_next_saturday():
-    d = pendulum.date(1975, 5, 21).next(6)
+    d = pendulum.date(1975, 5, 21).next(5)
     assert_date(d, 1975, 5, 24)
 
 
@@ -71,7 +71,7 @@ def test_previous_monday():
 
 
 def test_previous_saturday():
-    d = pendulum.date(1975, 5, 21).previous(6)
+    d = pendulum.date(1975, 5, 21).previous(5)
     assert_date(d, 1975, 5, 17)
 
 
@@ -93,7 +93,7 @@ def test_first_wednesday_of_month():
 
 
 def test_first_friday_of_month():
-    d = pendulum.date(1975, 11, 21).first_of("month", 5)
+    d = pendulum.date(1975, 11, 21).first_of("month", 4)
     assert_date(d, 1975, 11, 7)
 
 
@@ -108,7 +108,7 @@ def test_last_tuesday_of_month():
 
 
 def test_last_friday_of_month():
-    d = pendulum.date(1975, 12, 5).last_of("month", 5)
+    d = pendulum.date(1975, 12, 5).last_of("month", 4)
     assert_date(d, 1975, 12, 26)
 
 
@@ -139,7 +139,7 @@ def test_2nd_monday_of_month():
 
 
 def test_3rd_wednesday_of_month():
-    d = pendulum.date(1975, 12, 5).nth_of("month", 3, 3)
+    d = pendulum.date(1975, 12, 5).nth_of("month", 3, 2)
 
     assert_date(d, 1975, 12, 17)
 
@@ -155,7 +155,7 @@ def test_first_wednesday_of_quarter():
 
 
 def test_first_friday_of_quarter():
-    d = pendulum.date(1975, 11, 21).first_of("quarter", 5)
+    d = pendulum.date(1975, 11, 21).first_of("quarter", 4)
     assert_date(d, 1975, 10, 3)
 
 
@@ -215,7 +215,7 @@ def test_2nd_monday_of_quarter():
 
 
 def test_3rd_wednesday_of_quarter():
-    d = pendulum.date(1975, 8, 5).nth_of("quarter", 3, 3)
+    d = pendulum.date(1975, 8, 5).nth_of("quarter", 3, 2)
     assert_date(d, 1975, 7, 16)
 
 
@@ -230,7 +230,7 @@ def test_first_wednesday_of_year():
 
 
 def test_first_friday_of_year():
-    d = pendulum.date(1975, 11, 21).first_of("year", 5)
+    d = pendulum.date(1975, 11, 21).first_of("year", 4)
     assert_date(d, 1975, 1, 3)
 
 
@@ -245,7 +245,7 @@ def test_last_tuesday_of_year():
 
 
 def test_last_friday_of_year():
-    d = pendulum.date(1975, 8, 5).last_of("year", 5)
+    d = pendulum.date(1975, 8, 5).last_of("year", 4)
     assert_date(d, 1975, 12, 26)
 
 
diff --git a/tests/date/test_diff.py b/tests/date/test_diff.py
index 56358cc..cfececf 100644
--- a/tests/date/test_diff.py
+++ b/tests/date/test_diff.py
@@ -9,7 +9,7 @@ import pendulum
 
 @pytest.fixture
 def today():
-    return pendulum.today().date()
+    return pendulum.Date.today()
 
 
 def test_diff_in_years_positive():
diff --git a/tests/datetime/test_add.py b/tests/datetime/test_add.py
index 87ea39f..409f5bd 100644
--- a/tests/datetime/test_add.py
+++ b/tests/datetime/test_add.py
@@ -252,17 +252,29 @@ def test_add_time_to_new_transition_repeated_big():
     assert not dt.is_dst()
 
 
-def test_add_interval():
+def test_add_duration_across_transition():
     dt = pendulum.datetime(2017, 3, 11, 10, 45, tz="America/Los_Angeles")
     new = dt + pendulum.duration(hours=24)
 
     assert_datetime(new, 2017, 3, 12, 11, 45)
 
 
-def test_period_over_midnight_tz():
+def test_add_duration_across_transition_days():
+    dt = pendulum.datetime(2017, 3, 11, 10, 45, tz="America/Los_Angeles")
+    new = dt + pendulum.duration(days=1)
+
+    assert_datetime(new, 2017, 3, 12, 10, 45)
+
+    dt = pendulum.datetime(2023, 11, 5, 0, 0, tz="America/Chicago")
+    new = dt + pendulum.duration(days=1)
+
+    assert_datetime(new, 2023, 11, 6, 0, 0)
+
+
+def test_interval_over_midnight_tz():
     start = pendulum.datetime(2018, 2, 25, tz="Europe/Paris")
     end = start.add(hours=1)
-    period = end - start
-    new_end = start + period
+    interval = end - start
+    new_end = start + interval
 
     assert new_end == end
diff --git a/tests/datetime/test_behavior.py b/tests/datetime/test_behavior.py
index e02323a..76de1d6 100644
--- a/tests/datetime/test_behavior.py
+++ b/tests/datetime/test_behavior.py
@@ -158,6 +158,14 @@ def test_deepcopy():
     assert dt == deepcopy(dt)
 
 
+def test_deepcopy_on_transition():
+    dt = pendulum.datetime(2023, 11, 5, 1, 0, 0, tz="US/Pacific")
+    clone = deepcopy(dt)
+
+    assert dt == clone
+    assert dt.offset == clone.offset
+
+
 def test_pickle_timezone():
     dt1 = pendulum.timezone("Europe/Amsterdam")
     s = pickle.dumps(dt1)
diff --git a/tests/datetime/test_comparison.py b/tests/datetime/test_comparison.py
index ad81e73..c3cb064 100644
--- a/tests/datetime/test_comparison.py
+++ b/tests/datetime/test_comparison.py
@@ -75,7 +75,7 @@ def test_not_equal_with_timezone_true():
 def test_not_equal_to_none():
     d1 = pendulum.datetime(2000, 1, 1, 1, 2, 3)
 
-    assert d1 != None  # noqa
+    assert d1 is not None
 
 
 def test_greater_than_true():
diff --git a/tests/datetime/test_construct.py b/tests/datetime/test_construct.py
index 9488c08..b083cbe 100644
--- a/tests/datetime/test_construct.py
+++ b/tests/datetime/test_construct.py
@@ -5,17 +5,15 @@ import os
 from datetime import datetime
 
 import pytest
-import pytz
-
-from dateutil import tz
 
 import pendulum
 
 from pendulum import DateTime
-from pendulum.tz import timezone
+from pendulum import timezone
 from pendulum.utils._compat import PYPY
 from tests.conftest import assert_datetime
 
+
 if not PYPY:
     import time_machine
 else:
@@ -82,27 +80,6 @@ def test_yesterday():
     assert now.diff(yesterday, False).in_days() == -1
 
 
-def test_instance_naive_datetime_defaults_to_utc():
-    now = pendulum.instance(datetime.now())
-    assert now.timezone_name == "UTC"
-
-
-def test_instance_timezone_aware_datetime():
-    now = pendulum.instance(datetime.now(timezone("Europe/Paris")))
-    assert now.timezone_name == "Europe/Paris"
-
-
-def test_instance_timezone_aware_datetime_pytz():
-    now = pendulum.instance(datetime.now(pytz.timezone("Europe/Paris")))
-    assert now.timezone_name == "Europe/Paris"
-
-
-def test_instance_timezone_aware_datetime_any_tzinfo():
-    dt = datetime(2016, 8, 7, 12, 34, 56, tzinfo=tz.gettz("Europe/Paris"))
-    now = pendulum.instance(dt)
-    assert now.timezone_name == "+02:00"
-
-
 def test_now():
     now = pendulum.now("America/Toronto")
     in_paris = pendulum.now("Europe/Paris")
diff --git a/tests/datetime/test_day_of_week_modifiers.py b/tests/datetime/test_day_of_week_modifiers.py
index 46de84e..eb4bc4f 100644
--- a/tests/datetime/test_day_of_week_modifiers.py
+++ b/tests/datetime/test_day_of_week_modifiers.py
@@ -49,7 +49,7 @@ def test_next_monday():
 
 
 def test_next_saturday():
-    d = pendulum.datetime(1975, 5, 21).next(6)
+    d = pendulum.datetime(1975, 5, 21).next(5)
     assert_datetime(d, 1975, 5, 24, 0, 0, 0)
 
 
@@ -79,7 +79,7 @@ def test_previous_monday():
 
 
 def test_previous_saturday():
-    d = pendulum.datetime(1975, 5, 21).previous(6)
+    d = pendulum.datetime(1975, 5, 21).previous(5)
     assert_datetime(d, 1975, 5, 17, 0, 0, 0)
 
 
@@ -109,7 +109,7 @@ def test_first_wednesday_of_month():
 
 
 def test_first_friday_of_month():
-    d = pendulum.datetime(1975, 11, 21).first_of("month", 5)
+    d = pendulum.datetime(1975, 11, 21).first_of("month", 4)
     assert_datetime(d, 1975, 11, 7, 0, 0, 0)
 
 
@@ -124,7 +124,7 @@ def test_last_tuesday_of_month():
 
 
 def test_last_friday_of_month():
-    d = pendulum.datetime(1975, 12, 5).last_of("month", 5)
+    d = pendulum.datetime(1975, 12, 5).last_of("month", 4)
     assert_datetime(d, 1975, 12, 26, 0, 0, 0)
 
 
@@ -155,7 +155,7 @@ def test_2nd_monday_of_month():
 
 
 def test_3rd_wednesday_of_month():
-    d = pendulum.datetime(1975, 12, 5).nth_of("month", 3, 3)
+    d = pendulum.datetime(1975, 12, 5).nth_of("month", 3, 2)
 
     assert_datetime(d, 1975, 12, 17, 0, 0, 0)
 
@@ -171,7 +171,7 @@ def test_first_wednesday_of_quarter():
 
 
 def test_first_friday_of_quarter():
-    d = pendulum.datetime(1975, 11, 21).first_of("quarter", 5)
+    d = pendulum.datetime(1975, 11, 21).first_of("quarter", 4)
     assert_datetime(d, 1975, 10, 3, 0, 0, 0)
 
 
@@ -231,7 +231,7 @@ def test_2nd_monday_of_quarter():
 
 
 def test_3rd_wednesday_of_quarter():
-    d = pendulum.datetime(1975, 8, 5).nth_of("quarter", 3, 3)
+    d = pendulum.datetime(1975, 8, 5).nth_of("quarter", 3, 2)
     assert_datetime(d, 1975, 7, 16, 0, 0, 0)
 
 
@@ -246,7 +246,7 @@ def test_first_wednesday_of_year():
 
 
 def test_first_friday_of_year():
-    d = pendulum.datetime(1975, 11, 21).first_of("year", 5)
+    d = pendulum.datetime(1975, 11, 21).first_of("year", 4)
     assert_datetime(d, 1975, 1, 3, 0, 0, 0)
 
 
@@ -261,7 +261,7 @@ def test_last_tuesday_of_year():
 
 
 def test_last_friday_of_year():
-    d = pendulum.datetime(1975, 8, 5).last_of("year", 5)
+    d = pendulum.datetime(1975, 8, 5).last_of("year", 4)
     assert_datetime(d, 1975, 12, 26, 0, 0, 0)
 
 
diff --git a/tests/datetime/test_from_format.py b/tests/datetime/test_from_format.py
index 10c4a23..184c0a0 100644
--- a/tests/datetime/test_from_format.py
+++ b/tests/datetime/test_from_format.py
@@ -81,9 +81,8 @@ def test_from_format_with_invalid_padded_day():
         ("12/02/1999", "DD/MM/YYYY", "1999-02-12T00:00:00+00:00", None),
         ("12_02_1999", "DD_MM_YYYY", "1999-02-12T00:00:00+00:00", None),
         ("12:02:1999", "DD:MM:YYYY", "1999-02-12T00:00:00+00:00", None),
-        ("2-2-99", "D-M-YY", "2099-02-02T00:00:00+00:00", None),
-        ("2-2-99", "D-M-YY", "1999-02-02T00:00:00+00:00", "1990-01-01"),
-        ("99", "YY", "2099-01-01T00:00:00+00:00", None),
+        ("2-2-99", "D-M-YY", "1999-02-02T00:00:00+00:00", None),
+        ("99", "YY", "1999-01-01T00:00:00+00:00", None),
         ("300-1999", "DDD-YYYY", "1999-10-27T00:00:00+00:00", None),
         ("12-02-1999 2:45:10", "DD-MM-YYYY h:m:s", "1999-02-12T02:45:10+00:00", None),
         ("12-02-1999 12:45:10", "DD-MM-YYYY h:m:s", "1999-02-12T12:45:10+00:00", None),
@@ -100,7 +99,8 @@ def test_from_format_with_invalid_padded_day():
         ("Monday", "dddd", "2018-01-29T00:00:00+00:00", "2018-02-02"),
         ("Mon", "ddd", "2018-01-29T00:00:00+00:00", "2018-02-02"),
         ("Mo", "dd", "2018-01-29T00:00:00+00:00", "2018-02-02"),
-        ("0", "d", "2018-02-04T00:00:00+00:00", "2018-02-02"),
+        ("0", "d", "2018-01-29T00:00:00+00:00", "2018-02-02"),
+        ("6", "d", "2018-02-04T00:00:00+00:00", "2018-02-02"),
         ("1", "E", "2018-01-29T00:00:00+00:00", "2018-02-02"),
         ("March", "MMMM", "2018-03-01T00:00:00+00:00", "2018-02-02"),
         ("Mar", "MMM", "2018-03-01T00:00:00+00:00", "2018-02-02"),
@@ -150,10 +150,7 @@ def test_from_format_with_invalid_padded_day():
     ],
 )
 def test_from_format(text, fmt, expected, now):
-    if now is None:
-        now = pendulum.datetime(2015, 11, 12)
-    else:
-        now = pendulum.parse(now)
+    now = pendulum.datetime(2015, 11, 12) if now is None else pendulum.parse(now)
 
     with pendulum.travel_to(now, freeze=True):
         assert pendulum.from_format(text, fmt).isoformat() == expected
@@ -201,3 +198,25 @@ def test_strptime():
     assert_datetime(d, 1975, 5, 21, 22, 32, 11)
     assert isinstance(d, pendulum.DateTime)
     assert d.timezone_name == "UTC"
+
+
+def test_from_format_2_digit_year():
+    """
+    Complies with open group spec for 2 digit years
+    https://pubs.opengroup.org/onlinepubs/9699919799/
+
+    "If century is not specified, then values in the range [69,99] shall
+    refer to years 1969 to 1999 inclusive, and values in the
+    range [00,68] shall refer to years 2000 to 2068 inclusive."
+    """
+    d = pendulum.from_format("00", "YY")
+    assert d.year == 2000
+
+    d = pendulum.from_format("68", "YY")
+    assert d.year == 2068
+
+    d = pendulum.from_format("69", "YY")
+    assert d.year == 1969
+
+    d = pendulum.from_format("99", "YY")
+    assert d.year == 1999
diff --git a/tests/datetime/test_getters.py b/tests/datetime/test_getters.py
index 5074623..8f4c1ae 100644
--- a/tests/datetime/test_getters.py
+++ b/tests/datetime/test_getters.py
@@ -7,7 +7,7 @@ import pytest
 import pendulum
 
 from pendulum import DateTime
-from pendulum.tz import timezone
+from pendulum import timezone
 from tests.conftest import assert_date
 from tests.conftest import assert_time
 
@@ -126,7 +126,8 @@ def test_utc():
     assert pendulum.datetime(2012, 1, 1, tz="UTC").is_utc()
     assert pendulum.datetime(2012, 1, 1, tz=0).is_utc()
     assert not pendulum.datetime(2012, 1, 1, tz=5).is_utc()
-    # There is no time difference between Greenwich Mean Time and Coordinated Universal Time
+    # There is no time difference between Greenwich Mean Time
+    # and Coordinated Universal Time
     assert pendulum.datetime(2012, 1, 1, tz="GMT").is_utc()
 
 
@@ -194,6 +195,14 @@ def test_week_of_year_last_week():
     assert pendulum.datetime(2012, 12, 31).week_of_year == 1
 
 
+def test_week_of_month_edge_case():
+    assert pendulum.datetime(2020, 1, 1).week_of_month == 1
+    assert pendulum.datetime(2020, 1, 7).week_of_month == 2
+    assert pendulum.datetime(2020, 1, 14).week_of_month == 3
+    assert pendulum.datetime(2023, 1, 1).week_of_month == 1
+    assert pendulum.datetime(2023, 1, 31).week_of_month == 6
+
+
 def test_timezone():
     d = pendulum.datetime(2000, 1, 1, tz="America/Toronto")
     assert d.timezone.name == "America/Toronto"
@@ -246,3 +255,41 @@ def test_time():
     t = dt.time()
     assert isinstance(t, pendulum.Time)
     assert_time(t, 10, 40, 34, 123456)
+
+
+@pytest.mark.parametrize(
+    "date, expected",
+    [
+        (pendulum.Date(2000, 1, 1), 1),
+        (pendulum.Date(2000, 1, 3), 2),
+        (pendulum.Date(2019, 12, 29), 5),
+        (pendulum.Date(2019, 12, 30), 6),
+        (pendulum.Date(2019, 12, 31), 6),
+        (pendulum.Date(2020, 1, 7), 2),
+        (pendulum.Date(2020, 1, 14), 3),
+        (pendulum.Date(2021, 1, 1), 1),
+        (pendulum.Date(2021, 1, 2), 1),
+        (pendulum.Date(2021, 1, 9), 2),
+        (pendulum.Date(2021, 1, 10), 2),
+        (pendulum.Date(2021, 1, 11), 3),
+        (pendulum.Date(2021, 1, 15), 3),
+        (pendulum.Date(2021, 1, 16), 3),
+        (pendulum.Date(2021, 1, 17), 3),
+        (pendulum.Date(2021, 1, 23), 4),
+        (pendulum.Date(2021, 1, 31), 5),
+        (pendulum.Date(2021, 12, 19), 3),
+        (pendulum.Date(2021, 12, 25), 4),
+        (pendulum.Date(2021, 12, 26), 4),
+        (pendulum.Date(2021, 12, 29), 5),
+        (pendulum.Date(2021, 12, 30), 5),
+        (pendulum.Date(2021, 12, 31), 5),
+        (pendulum.Date(2022, 1, 1), 1),
+        (pendulum.Date(2022, 1, 3), 2),
+        (pendulum.Date(2022, 1, 10), 3),
+        (pendulum.Date(2023, 1, 1), 1),
+        (pendulum.Date(2023, 1, 2), 2),
+        (pendulum.Date(2029, 12, 31), 6),
+    ],
+)
+def test_week_of_month_negative(date, expected):
+    assert date.week_of_month == expected
diff --git a/tests/datetime/test_start_end_of.py b/tests/datetime/test_start_end_of.py
index 597dbeb..1937e74 100644
--- a/tests/datetime/test_start_end_of.py
+++ b/tests/datetime/test_start_end_of.py
@@ -277,9 +277,49 @@ def test_start_of_with_transition():
     assert d.start_of("year").offset == 3600
 
 
+def test_start_of_on_date_before_transition():
+    d = pendulum.datetime(2013, 10, 27, 0, 59, 59, tz="UTC").in_timezone("Europe/Paris")
+    assert d.offset == 7200
+    assert d.start_of("minute").offset == 7200
+    assert d.start_of("hour").offset == 7200
+    assert d.start_of("day").offset == 7200
+    assert d.start_of("month").offset == 7200
+    assert d.start_of("year").offset == 3600
+
+
+def test_start_of_on_date_after_transition():
+    d = pendulum.datetime(2013, 10, 27, 1, 59, 59, tz="UTC").in_timezone("Europe/Paris")
+    assert d.offset == 3600
+    assert d.start_of("minute").offset == 3600
+    assert d.start_of("hour").offset == 3600
+    assert d.start_of("day").offset == 7200
+    assert d.start_of("month").offset == 7200
+    assert d.start_of("year").offset == 3600
+
+
 def test_end_of_with_transition():
     d = pendulum.datetime(2013, 3, 31, tz="Europe/Paris")
     assert d.offset == 3600
     assert d.end_of("month").offset == 7200
     assert d.end_of("day").offset == 7200
     assert d.end_of("year").offset == 3600
+
+
+def test_end_of_on_date_before_transition():
+    d = pendulum.datetime(2013, 10, 27, 0, 0, 0, tz="UTC").in_timezone("Europe/Paris")
+    assert d.offset == 7200
+    assert d.end_of("minute").offset == 7200
+    assert d.end_of("hour").offset == 7200
+    assert d.end_of("day").offset == 3600
+    assert d.end_of("month").offset == 3600
+    assert d.end_of("year").offset == 3600
+
+
+def test_end_of_on_date_after_transition():
+    d = pendulum.datetime(2013, 10, 27, 1, 0, 0, tz="UTC").in_timezone("Europe/Paris")
+    assert d.offset == 3600
+    assert d.end_of("minute").offset == 3600
+    assert d.end_of("hour").offset == 3600
+    assert d.end_of("day").offset == 3600
+    assert d.end_of("month").offset == 3600
+    assert d.end_of("year").offset == 3600
diff --git a/tests/datetime/test_strings.py b/tests/datetime/test_strings.py
index 0de340d..e78dbc8 100644
--- a/tests/datetime/test_strings.py
+++ b/tests/datetime/test_strings.py
@@ -7,9 +7,9 @@ import pendulum
 
 def test_to_string():
     d = pendulum.datetime(1975, 12, 25, 0, 0, 0, 0, tz="local")
-    assert str(d) == d.to_iso8601_string()
+    assert str(d) == "1975-12-25 00:00:00-05:00"
     d = pendulum.datetime(1975, 12, 25, 0, 0, 0, 123456, tz="local")
-    assert str(d) == d.to_iso8601_string()
+    assert str(d) == "1975-12-25 00:00:00.123456-05:00"
 
 
 def test_to_date_string():
@@ -109,11 +109,11 @@ def test_to_string_invalid():
 
 def test_repr():
     d = pendulum.datetime(1975, 12, 25, 14, 15, 16, tz="local")
-    expected = f"DateTime(1975, 12, 25, 14, 15, 16, tzinfo={repr(d.tzinfo)})"
+    expected = f"DateTime(1975, 12, 25, 14, 15, 16, tzinfo={d.tzinfo!r})"
     assert repr(d) == expected
 
     d = pendulum.datetime(1975, 12, 25, 14, 15, 16, 123456, tz="local")
-    expected = f"DateTime(1975, 12, 25, 14, 15, 16, 123456, tzinfo={repr(d.tzinfo)})"
+    expected = f"DateTime(1975, 12, 25, 14, 15, 16, 123456, tzinfo={d.tzinfo!r})"
     assert repr(d) == expected
 
 
@@ -135,7 +135,7 @@ def test_for_json():
 
 def test_format():
     d = pendulum.datetime(1975, 12, 25, 14, 15, 16, tz="Europe/Paris")
-    assert f"{d}" == "1975-12-25T14:15:16+01:00"
+    assert f"{d}" == "1975-12-25 14:15:16+01:00"
     assert f"{d:YYYY}" == "1975"
     assert f"{d:%Y}" == "1975"
     assert f"{d:%H:%M %d.%m.%Y}" == "14:15 25.12.1975"
diff --git a/tests/duration/test_behavior.py b/tests/duration/test_behavior.py
index a97bbde..2442534 100644
--- a/tests/duration/test_behavior.py
+++ b/tests/duration/test_behavior.py
@@ -2,12 +2,15 @@ from __future__ import annotations
 
 import pickle
 
+from copy import deepcopy
 from datetime import timedelta
 
 import pendulum
 
+from tests.conftest import assert_duration
 
-def test_pickle():
+
+def test_pickle() -> None:
     it = pendulum.duration(days=3, seconds=2456, microseconds=123456)
     s = pickle.dumps(it)
     it2 = pickle.loads(s)
@@ -15,7 +18,15 @@ def test_pickle():
     assert it == it2
 
 
-def test_comparison_to_timedelta():
+def test_comparison_to_timedelta() -> None:
     duration = pendulum.duration(days=3)
 
     assert duration < timedelta(days=4)
+
+
+def test_deepcopy() -> None:
+    duration = pendulum.duration(months=1)
+    copied_duration = deepcopy(duration)
+
+    assert copied_duration == duration
+    assert_duration(copied_duration, months=1)
diff --git a/tests/formatting/test_formatter.py b/tests/formatting/test_formatter.py
index 76c7a7f..4c4b008 100644
--- a/tests/formatting/test_formatter.py
+++ b/tests/formatting/test_formatter.py
@@ -113,6 +113,20 @@ def test_day_of_week():
     assert f.format(d, "do") == "0th"
 
 
+def test_localized_day_of_week():
+    f = Formatter()
+    d = pendulum.datetime(2016, 8, 28)
+    assert f.format(d, "e") == "0"
+    assert f.format(d, "e", locale="en-gb") == "6"
+    assert f.format(d.add(days=2), "e") == "2"
+    assert f.format(d.add(days=2), "e", locale="en-gb") == "1"
+
+    assert f.format(d, "eo") == "1st"
+    assert f.format(d, "eo", locale="en-gb") == "7th"
+    assert f.format(d.add(days=2), "eo") == "3rd"
+    assert f.format(d.add(days=2), "eo", locale="en-gb") == "2nd"
+
+
 def test_day_of_iso_week():
     f = Formatter()
     d = pendulum.datetime(2016, 8, 28)
diff --git a/tests/interval/test_add_subtract.py b/tests/interval/test_add_subtract.py
index 88525a3..d1f6036 100644
--- a/tests/interval/test_add_subtract.py
+++ b/tests/interval/test_add_subtract.py
@@ -6,8 +6,8 @@ import pendulum
 def test_dst_add():
     start = pendulum.datetime(2017, 3, 7, tz="America/Toronto")
     end = start.add(days=6)
-    period = end - start
-    new_end = start + period
+    interval = end - start
+    new_end = start + interval
 
     assert new_end == end
 
@@ -15,8 +15,8 @@ def test_dst_add():
 def test_dst_add_non_variable_units():
     start = pendulum.datetime(2013, 3, 31, 1, 30, tz="Europe/Paris")
     end = start.add(hours=1)
-    period = end - start
-    new_end = start + period
+    interval = end - start
+    new_end = start + interval
 
     assert new_end == end
 
@@ -24,8 +24,8 @@ def test_dst_add_non_variable_units():
 def test_dst_subtract():
     start = pendulum.datetime(2017, 3, 7, tz="America/Toronto")
     end = start.add(days=6)
-    period = end - start
-    new_start = end - period
+    interval = end - start
+    new_start = end - interval
 
     assert new_start == start
 
@@ -33,8 +33,8 @@ def test_dst_subtract():
 def test_naive_subtract():
     start = pendulum.naive(2013, 3, 31, 1, 30)
     end = start.add(hours=1)
-    period = end - start
-    new_end = start + period
+    interval = end - start
+    new_end = start + interval
 
     assert new_end == end
 
@@ -43,7 +43,7 @@ def test_negative_difference_subtract():
     start = pendulum.datetime(2018, 5, 28, 12, 34, 56, 123456)
     end = pendulum.datetime(2018, 1, 1)
 
-    period = end - start
-    new_end = start + period
+    interval = end - start
+    new_end = start + interval
 
     assert new_end == end
diff --git a/tests/interval/test_behavior.py b/tests/interval/test_behavior.py
index b5e057a..96a1f42 100644
--- a/tests/interval/test_behavior.py
+++ b/tests/interval/test_behavior.py
@@ -40,15 +40,28 @@ def test_comparison_to_timedelta():
     dt1 = pendulum.datetime(2016, 11, 18)
     dt2 = pendulum.datetime(2016, 11, 20)
 
-    period = dt2 - dt1
+    interval = dt2 - dt1
 
-    assert period < timedelta(days=4)
+    assert interval < timedelta(days=4)
 
 
 def test_equality_to_timedelta():
     dt1 = pendulum.datetime(2016, 11, 18)
     dt2 = pendulum.datetime(2016, 11, 20)
 
-    period = dt2 - dt1
+    interval = dt2 - dt1
 
-    assert period == timedelta(days=2)
+    assert interval == timedelta(days=2)
+
+
+def test_inequality():
+    dt1 = pendulum.datetime(2016, 11, 18)
+    dt2 = pendulum.datetime(2016, 11, 20)
+    dt3 = pendulum.datetime(2016, 11, 22)
+
+    interval1 = dt2 - dt1
+    interval2 = dt3 - dt2
+    interval3 = dt3 - dt1
+
+    assert interval1 != interval2
+    assert interval1 != interval3
diff --git a/tests/interval/test_construct.py b/tests/interval/test_construct.py
index 024e741..550b808 100644
--- a/tests/interval/test_construct.py
+++ b/tests/interval/test_construct.py
@@ -72,17 +72,17 @@ def test_accuracy():
 def test_dst_transition():
     start = pendulum.datetime(2017, 3, 7, tz="America/Toronto")
     end = start.add(days=6)
-    period = end - start
+    interval = end - start
 
-    assert period.days == 5
-    assert period.seconds == 82800
+    assert interval.days == 5
+    assert interval.seconds == 82800
 
-    assert period.remaining_days == 6
-    assert period.hours == 0
-    assert period.remaining_seconds == 0
+    assert interval.remaining_days == 6
+    assert interval.hours == 0
+    assert interval.remaining_seconds == 0
 
-    assert period.in_days() == 6
-    assert period.in_hours() == 5 * 24 + 23
+    assert interval.in_days() == 6
+    assert interval.in_hours() == 5 * 24 + 23
 
 
 def test_timedelta_behavior():
@@ -108,14 +108,14 @@ def test_timedelta_behavior():
 def test_different_timezones_same_time():
     dt1 = pendulum.datetime(2013, 3, 31, 1, 30, tz="Europe/Paris")
     dt2 = pendulum.datetime(2013, 4, 1, 1, 30, tz="Europe/Paris")
-    period = dt2 - dt1
+    interval = dt2 - dt1
 
-    assert period.in_words() == "1 day"
-    assert period.in_hours() == 23
+    assert interval.in_words() == "1 day"
+    assert interval.in_hours() == 23
 
     dt1 = pendulum.datetime(2013, 3, 31, 1, 30, tz="Europe/Paris")
     dt2 = pendulum.datetime(2013, 4, 1, 1, 30, tz="America/Toronto")
-    period = dt2 - dt1
+    interval = dt2 - dt1
 
-    assert period.in_words() == "1 day 5 hours"
-    assert period.in_hours() == 29
+    assert interval.in_words() == "1 day 5 hours"
+    assert interval.in_hours() == 29
diff --git a/tests/interval/test_hashing.py b/tests/interval/test_hashing.py
index c18502f..ca9ef9c 100644
--- a/tests/interval/test_hashing.py
+++ b/tests/interval/test_hashing.py
@@ -3,21 +3,21 @@ from __future__ import annotations
 import pendulum
 
 
-def test_periods_with_same_duration_and_different_dates():
+def test_intervals_with_same_duration_and_different_dates():
     day1 = pendulum.DateTime(2018, 1, 1)
     day2 = pendulum.DateTime(2018, 1, 2)
     day3 = pendulum.DateTime(2018, 1, 2)
 
-    period1 = day2 - day1
-    period2 = day3 - day2
+    interval1 = day2 - day1
+    interval2 = day3 - day2
 
-    assert period1 != period2
-    assert len({period1, period2}) == 2
+    assert interval1 != interval2
+    assert len({interval1, interval2}) == 2
 
 
-def test_periods_with_same_dates():
-    period1 = pendulum.DateTime(2018, 1, 2) - pendulum.DateTime(2018, 1, 1)
-    period2 = pendulum.DateTime(2018, 1, 2) - pendulum.DateTime(2018, 1, 1)
+def test_intervals_with_same_dates():
+    interval1 = pendulum.DateTime(2018, 1, 2) - pendulum.DateTime(2018, 1, 1)
+    interval2 = pendulum.DateTime(2018, 1, 2) - pendulum.DateTime(2018, 1, 1)
 
-    assert period1 == period2
-    assert len({period1, period2}) == 1
+    assert interval1 == interval2
+    assert len({interval1, interval2}) == 1
diff --git a/tests/interval/test_in_words.py b/tests/interval/test_in_words.py
index 410e11f..f60e20d 100644
--- a/tests/interval/test_in_words.py
+++ b/tests/interval/test_in_words.py
@@ -5,66 +5,66 @@ import pendulum
 
 def test_week():
     start_date = pendulum.datetime(2012, 1, 1)
-    period = pendulum.interval(start=start_date, end=start_date.add(weeks=1))
-    assert period.in_words() == "1 week"
+    interval = pendulum.interval(start=start_date, end=start_date.add(weeks=1))
+    assert interval.in_words() == "1 week"
 
 
 def test_week_and_day():
     start_date = pendulum.datetime(2012, 1, 1)
-    period = pendulum.interval(start=start_date, end=start_date.add(weeks=1, days=1))
-    assert period.in_words() == "1 week 1 day"
+    interval = pendulum.interval(start=start_date, end=start_date.add(weeks=1, days=1))
+    assert interval.in_words() == "1 week 1 day"
 
 
 def test_all():
     start_date = pendulum.datetime(2012, 1, 1)
-    period = pendulum.interval(
+    interval = pendulum.interval(
         start=start_date,
         end=start_date.add(years=1, months=1, days=1, seconds=1, microseconds=1),
     )
-    assert period.in_words() == "1 year 1 month 1 day 1 second"
+    assert interval.in_words() == "1 year 1 month 1 day 1 second"
 
 
 def test_in_french():
     start_date = pendulum.datetime(2012, 1, 1)
-    period = pendulum.interval(
+    interval = pendulum.interval(
         start=start_date,
         end=start_date.add(years=1, months=1, days=1, seconds=1, microseconds=1),
     )
-    assert period.in_words(locale="fr") == "1 an 1 mois 1 jour 1 seconde"
+    assert interval.in_words(locale="fr") == "1 an 1 mois 1 jour 1 seconde"
 
 
 def test_singular_negative_values():
     start_date = pendulum.datetime(2012, 1, 1)
-    period = pendulum.interval(start=start_date, end=start_date.subtract(days=1))
-    assert period.in_words() == "-1 day"
+    interval = pendulum.interval(start=start_date, end=start_date.subtract(days=1))
+    assert interval.in_words() == "-1 day"
 
 
 def test_separator():
     start_date = pendulum.datetime(2012, 1, 1)
-    period = pendulum.interval(
+    interval = pendulum.interval(
         start=start_date,
         end=start_date.add(years=1, months=1, days=1, seconds=1, microseconds=1),
     )
-    assert period.in_words(separator=", ") == "1 year, 1 month, 1 day, 1 second"
+    assert interval.in_words(separator=", ") == "1 year, 1 month, 1 day, 1 second"
 
 
 def test_subseconds():
     start_date = pendulum.datetime(2012, 1, 1)
-    period = pendulum.interval(
+    interval = pendulum.interval(
         start=start_date, end=start_date.add(microseconds=123456)
     )
-    assert period.in_words() == "0.12 second"
+    assert interval.in_words() == "0.12 second"
 
 
 def test_subseconds_with_seconds():
     start_date = pendulum.datetime(2012, 1, 1)
-    period = pendulum.interval(
+    interval = pendulum.interval(
         start=start_date, end=start_date.add(seconds=12, microseconds=123456)
     )
-    assert period.in_words() == "12 seconds"
+    assert interval.in_words() == "12 seconds"
 
 
-def test_zero_period():
+def test_zero_interval():
     start_date = pendulum.datetime(2012, 1, 1)
-    period = pendulum.interval(start=start_date, end=start_date)
-    assert period.in_words() == "0 microseconds"
+    interval = pendulum.interval(start=start_date, end=start_date)
+    assert interval.in_words() == "0 microseconds"
diff --git a/tests/interval/test_range.py b/tests/interval/test_range.py
index 28fe1ff..0b883e5 100644
--- a/tests/interval/test_range.py
+++ b/tests/interval/test_range.py
@@ -47,7 +47,7 @@ def test_iter():
     dt2 = pendulum.datetime(2000, 1, 31, 12, 45, 37)
 
     p = Interval(dt1, dt2)
-    i = 0  # noqa: SIM113 (suggests use of enumerate)
+    i = 0
     for dt in p:
         assert isinstance(dt, pendulum.DateTime)
         i += 1
diff --git a/tests/localization/test_cs.py b/tests/localization/test_cs.py
index 71b8340..c3c2d1c 100644
--- a/tests/localization/test_cs.py
+++ b/tests/localization/test_cs.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "cs"
 
 
diff --git a/tests/localization/test_da.py b/tests/localization/test_da.py
index b08adfe..34c69b1 100644
--- a/tests/localization/test_da.py
+++ b/tests/localization/test_da.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "da"
 
 
diff --git a/tests/localization/test_de.py b/tests/localization/test_de.py
index 9c72b79..4abc3f5 100644
--- a/tests/localization/test_de.py
+++ b/tests/localization/test_de.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "de"
 
 
diff --git a/tests/localization/test_es.py b/tests/localization/test_es.py
index 747ec6f..64d5dbb 100644
--- a/tests/localization/test_es.py
+++ b/tests/localization/test_es.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "es"
 
 
diff --git a/tests/localization/test_fa.py b/tests/localization/test_fa.py
index 39d2e4a..5bb25ad 100644
--- a/tests/localization/test_fa.py
+++ b/tests/localization/test_fa.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "fa"
 
 
diff --git a/tests/localization/test_fo.py b/tests/localization/test_fo.py
index f451553..a2b72de 100644
--- a/tests/localization/test_fo.py
+++ b/tests/localization/test_fo.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "fo"
 
 
diff --git a/tests/localization/test_fr.py b/tests/localization/test_fr.py
index 1cfef5b..e689a19 100644
--- a/tests/localization/test_fr.py
+++ b/tests/localization/test_fr.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "fr"
 
 
diff --git a/tests/localization/test_he.py b/tests/localization/test_he.py
index 6186ef2..0695a64 100644
--- a/tests/localization/test_he.py
+++ b/tests/localization/test_he.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "he"
 
 
diff --git a/tests/localization/test_id.py b/tests/localization/test_id.py
index 3dd316c..3ae668d 100644
--- a/tests/localization/test_id.py
+++ b/tests/localization/test_id.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "id"
 
 
diff --git a/tests/localization/test_it.py b/tests/localization/test_it.py
index 1918a2b..1f79c6e 100644
--- a/tests/localization/test_it.py
+++ b/tests/localization/test_it.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "it"
 
 
diff --git a/tests/localization/test_ja.py b/tests/localization/test_ja.py
index 82457fd..6f38d05 100644
--- a/tests/localization/test_ja.py
+++ b/tests/localization/test_ja.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "ja"
 
 
diff --git a/tests/localization/test_ko.py b/tests/localization/test_ko.py
index e33ca25..c03a372 100644
--- a/tests/localization/test_ko.py
+++ b/tests/localization/test_ko.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "ko"
 
 
diff --git a/tests/localization/test_lt.py b/tests/localization/test_lt.py
index 71de1ac..4b75394 100644
--- a/tests/localization/test_lt.py
+++ b/tests/localization/test_lt.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "lt"
 
 
diff --git a/tests/localization/test_nb.py b/tests/localization/test_nb.py
index 3f696e5..19b7d1c 100644
--- a/tests/localization/test_nb.py
+++ b/tests/localization/test_nb.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "nb"
 
 
diff --git a/tests/localization/test_nl.py b/tests/localization/test_nl.py
index 68227ec..fde63b4 100644
--- a/tests/localization/test_nl.py
+++ b/tests/localization/test_nl.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "nl"
 
 
diff --git a/tests/localization/test_nn.py b/tests/localization/test_nn.py
index d4b8099..7751858 100644
--- a/tests/localization/test_nn.py
+++ b/tests/localization/test_nn.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "nn"
 
 
diff --git a/tests/localization/test_pl.py b/tests/localization/test_pl.py
index 2b6e707..7253096 100644
--- a/tests/localization/test_pl.py
+++ b/tests/localization/test_pl.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "pl"
 
 
diff --git a/tests/localization/test_ru.py b/tests/localization/test_ru.py
index be0e645..b0a7712 100644
--- a/tests/localization/test_ru.py
+++ b/tests/localization/test_ru.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "ru"
 
 
diff --git a/tests/localization/test_sk.py b/tests/localization/test_sk.py
index 5553e7f..2c18f93 100644
--- a/tests/localization/test_sk.py
+++ b/tests/localization/test_sk.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "sk"
 
 
diff --git a/tests/localization/test_sv.py b/tests/localization/test_sv.py
index e0e4e65..e4b7051 100644
--- a/tests/localization/test_sv.py
+++ b/tests/localization/test_sv.py
@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import pendulum
 
+
 locale = "sv"
 
 
diff --git a/tests/localization/test_tr.py b/tests/localization/test_tr.py
new file mode 100644
index 0000000..5ec00ee
--- /dev/null
+++ b/tests/localization/test_tr.py
@@ -0,0 +1,66 @@
+from __future__ import annotations
+
+import pendulum
+
+
+locale = "tr"
+
+
+def test_diff_for_humans():
+    with pendulum.travel_to(pendulum.datetime(2016, 8, 29), freeze=True):
+        diff_for_humans()
+
+
+def diff_for_humans():
+    d = pendulum.now().subtract(seconds=1)
+    assert d.diff_for_humans(locale=locale) == "1 saniye önce"
+
+    d = pendulum.now().subtract(seconds=2)
+    assert d.diff_for_humans(locale=locale) == "2 saniye önce"
+
+    d = pendulum.now().subtract(minutes=1)
+    assert d.diff_for_humans(locale=locale) == "1 dakika önce"
+
+    d = pendulum.now().subtract(minutes=2)
+    assert d.diff_for_humans(locale=locale) == "2 dakika önce"
+
+    d = pendulum.now().subtract(hours=1)
+    assert d.diff_for_humans(locale=locale) == "1 saat önce"
+
+    d = pendulum.now().subtract(hours=2)
+    assert d.diff_for_humans(locale=locale) == "2 saat önce"
+
+    d = pendulum.now().subtract(days=1)
+    assert d.diff_for_humans(locale=locale) == "1 gün önce"
+
+    d = pendulum.now().subtract(days=2)
+    assert d.diff_for_humans(locale=locale) == "2 gün önce"
+
+    d = pendulum.now().subtract(weeks=1)
+    assert d.diff_for_humans(locale=locale) == "1 hafta önce"
+
+    d = pendulum.now().subtract(weeks=2)
+    assert d.diff_for_humans(locale=locale) == "2 hafta önce"
+
+    d = pendulum.now().subtract(months=1)
+    assert d.diff_for_humans(locale=locale) == "1 ay önce"
+
+    d = pendulum.now().subtract(months=2)
+    assert d.diff_for_humans(locale=locale) == "2 ay önce"
+
+    d = pendulum.now().subtract(years=1)
+    assert d.diff_for_humans(locale=locale) == "1 yıl önce"
+
+    d = pendulum.now().subtract(years=2)
+    assert d.diff_for_humans(locale=locale) == "2 yıl önce"
+
+    d = pendulum.now().add(seconds=1)
+    assert d.diff_for_humans(locale=locale) == "1 saniye sonra"
+
+    d = pendulum.now().add(seconds=1)
+    d2 = pendulum.now()
+    assert d.diff_for_humans(d2, locale=locale) == "1 saniye sonra"
+    assert d2.diff_for_humans(d, locale=locale) == "1 saniye önce"
+
+    assert d.diff_for_humans(d2, True, locale=locale) == "1 saniye"
+    assert d2.diff_for_humans(d.add(seconds=1), True, locale=locale) == "2 saniye"
diff --git a/tests/parsing/test_parse_iso8601.py b/tests/parsing/test_parse_iso8601.py
index 0047791..c15b9bd 100644
--- a/tests/parsing/test_parse_iso8601.py
+++ b/tests/parsing/test_parse_iso8601.py
@@ -8,83 +8,86 @@ import pytest
 
 from pendulum.parsing import parse_iso8601
 
+
 try:
-    from pendulum.parsing._extension import TZFixedOffset as FixedTimezone
+    from pendulum._pendulum import FixedTimezone
 except ImportError:
     from pendulum.tz.timezone import FixedTimezone
 
 
-def test_parse_iso8601():
-    # Date
-    assert date(2016, 1, 1) == parse_iso8601("2016")
-    assert date(2016, 10, 1) == parse_iso8601("2016-10")
-    assert date(2016, 10, 6) == parse_iso8601("2016-10-06")
-    assert date(2016, 10, 6) == parse_iso8601("20161006")
-
-    # Time
-    assert time(20, 16, 10, 0) == parse_iso8601("201610")
-
-    # Datetime
-    assert datetime(2016, 10, 6, 12, 34, 56, 123456) == parse_iso8601(
-        "2016-10-06T12:34:56.123456"
-    )
-    assert datetime(2016, 10, 6, 12, 34, 56, 123000) == parse_iso8601(
-        "2016-10-06T12:34:56.123"
-    )
-    assert datetime(2016, 10, 6, 12, 34, 56, 123) == parse_iso8601(
-        "2016-10-06T12:34:56.000123"
-    )
-    assert datetime(2016, 10, 6, 12, 0, 0, 0) == parse_iso8601("2016-10-06T12")
-    assert datetime(2016, 10, 6, 12, 34, 56, 0) == parse_iso8601("2016-10-06T123456")
-    assert datetime(2016, 10, 6, 12, 34, 56, 123456) == parse_iso8601(
-        "2016-10-06T123456.123456"
-    )
-    assert datetime(2016, 10, 6, 12, 34, 56, 123456) == parse_iso8601(
-        "20161006T123456.123456"
-    )
-    assert datetime(2016, 10, 6, 12, 34, 56, 123456) == parse_iso8601(
-        "20161006 123456.123456"
-    )
-
-    # Datetime with offset
-    assert datetime(
-        2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(19800)
-    ) == parse_iso8601("2016-10-06T12:34:56.123456+05:30")
-    assert datetime(
-        2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(19800)
-    ) == parse_iso8601("2016-10-06T12:34:56.123456+0530")
-    assert datetime(
-        2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(-19800)
-    ) == parse_iso8601("2016-10-06T12:34:56.123456-05:30")
-    assert datetime(
-        2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(-19800)
-    ) == parse_iso8601("2016-10-06T12:34:56.123456-0530")
-    assert datetime(
-        2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(18000)
-    ) == parse_iso8601("2016-10-06T12:34:56.123456+05")
-    assert datetime(
-        2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(-18000)
-    ) == parse_iso8601("2016-10-06T12:34:56.123456-05")
-    assert datetime(
-        2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(-18000)
-    ) == parse_iso8601("20161006T123456,123456-05")
-    assert datetime(
-        2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(+19800)
-    ) == parse_iso8601("2016-10-06T12:34:56.123456789+05:30")
-
-    # Ordinal date
-    assert date(2012, 1, 7) == parse_iso8601("2012-007")
-    assert date(2012, 1, 7) == parse_iso8601("2012007")
-    assert date(2017, 3, 20) == parse_iso8601("2017-079")
-
-    # Week date
-    assert date(2012, 1, 30) == parse_iso8601("2012-W05")
-    assert date(2008, 9, 27) == parse_iso8601("2008-W39-6")
-    assert date(2010, 1, 3) == parse_iso8601("2009-W53-7")
-    assert date(2008, 12, 29) == parse_iso8601("2009-W01-1")
-
-    # Week date wth time
-    assert datetime(2008, 9, 27, 9, 0, 0, 0) == parse_iso8601("2008-W39-6T09")
+@pytest.mark.parametrize(
+    ["text", "expected"],
+    [
+        ("2016-10", date(2016, 10, 1)),
+        ("2016-10-06", date(2016, 10, 6)),
+        # Ordinal date
+        ("2012-007", date(2012, 1, 7)),
+        ("2012007", date(2012, 1, 7)),
+        ("2017-079", date(2017, 3, 20)),
+        # Week date
+        ("2012-W05", date(2012, 1, 30)),
+        ("2008-W39-6", date(2008, 9, 27)),
+        ("2009-W53-7", date(2010, 1, 3)),
+        ("2009-W01-1", date(2008, 12, 29)),
+        # Time
+        ("12:34", time(12, 34, 0)),
+        ("12:34:56", time(12, 34, 56)),
+        ("12:34:56.123", time(12, 34, 56, 123000)),
+        ("12:34:56.123456", time(12, 34, 56, 123456)),
+        ("12:34+05:30", time(12, 34, 0, tzinfo=FixedTimezone(19800))),
+        ("12:34:56+05:30", time(12, 34, 56, tzinfo=FixedTimezone(19800))),
+        ("12:34:56.123+05:30", time(12, 34, 56, 123000, tzinfo=FixedTimezone(19800))),
+        (
+            "12:34:56.123456+05:30",
+            time(12, 34, 56, 123456, tzinfo=FixedTimezone(19800)),
+        ),
+        # Datetime
+        ("2016-10-06T12:34:56.123456", datetime(2016, 10, 6, 12, 34, 56, 123456)),
+        ("2016-10-06T12:34:56.123", datetime(2016, 10, 6, 12, 34, 56, 123000)),
+        ("2016-10-06T12:34:56.000123", datetime(2016, 10, 6, 12, 34, 56, 123)),
+        ("20161006T12", datetime(2016, 10, 6, 12, 0, 0, 0)),
+        ("20161006T123456", datetime(2016, 10, 6, 12, 34, 56, 0)),
+        ("20161006T123456.123456", datetime(2016, 10, 6, 12, 34, 56, 123456)),
+        ("20161006 123456.123456", datetime(2016, 10, 6, 12, 34, 56, 123456)),
+        # Datetime with offset
+        (
+            "2016-10-06T12:34:56.123456+05:30",
+            datetime(2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(19800)),
+        ),
+        (
+            "2016-10-06T12:34:56.123456+0530",
+            datetime(2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(19800)),
+        ),
+        (
+            "2016-10-06T12:34:56.123456-05:30",
+            datetime(2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(-19800)),
+        ),
+        (
+            "2016-10-06T12:34:56.123456-0530",
+            datetime(2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(-19800)),
+        ),
+        (
+            "2016-10-06T12:34:56.123456+05",
+            datetime(2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(18000)),
+        ),
+        (
+            "2016-10-06T12:34:56.123456-05",
+            datetime(2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(-18000)),
+        ),
+        (
+            "20161006T123456,123456-05",
+            datetime(2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(-18000)),
+        ),
+        (
+            "2016-10-06T12:34:56.123456789+05:30",
+            datetime(2016, 10, 6, 12, 34, 56, 123456, FixedTimezone(+19800)),
+        ),
+        # Week date with time
+        ("2008-W39-6T09", datetime(2008, 9, 27, 9, 0, 0, 0)),
+    ],
+)
+def test_parse_iso8601(text: str, expected: date) -> None:
+    assert parse_iso8601(text) == expected
 
 
 def test_parse_ios8601_invalid():
@@ -165,301 +168,43 @@ def test_parse_ios8601_invalid():
         parse_iso8601("2012-W123")  # Missing separator
 
 
-def test_parse_ios8601_duration():
-    text = "P2Y3M4DT5H6M7S"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 2
-    assert parsed.months == 3
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 4
-    assert parsed.hours == 5
-    assert parsed.minutes == 6
-    assert parsed.remaining_seconds == 7
-    assert parsed.microseconds == 0
-
-    text = "P1Y2M3DT4H5M6.5S"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 1
-    assert parsed.months == 2
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 3
-    assert parsed.hours == 4
-    assert parsed.minutes == 5
-    assert parsed.remaining_seconds == 6
-    assert parsed.microseconds == 500000
-
-    text = "P1Y2M3DT4H5M6,5S"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 1
-    assert parsed.months == 2
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 3
-    assert parsed.hours == 4
-    assert parsed.minutes == 5
-    assert parsed.remaining_seconds == 6
-    assert parsed.microseconds == 500000
-
-    text = "P1Y2M3D"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 1
-    assert parsed.months == 2
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 3
-    assert parsed.hours == 0
-    assert parsed.minutes == 0
-    assert parsed.remaining_seconds == 0
-    assert parsed.microseconds == 0
-
-    text = "P1Y2M3.5D"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 1
-    assert parsed.months == 2
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 3
-    assert parsed.hours == 12
-    assert parsed.minutes == 0
-    assert parsed.remaining_seconds == 0
-    assert parsed.microseconds == 0
-
-    text = "P1Y2M3,5D"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 1
-    assert parsed.months == 2
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 3
-    assert parsed.hours == 12
-    assert parsed.minutes == 0
-    assert parsed.remaining_seconds == 0
-    assert parsed.microseconds == 0
-
-    text = "PT4H54M6.5S"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 0
-    assert parsed.months == 0
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 0
-    assert parsed.hours == 4
-    assert parsed.minutes == 54
-    assert parsed.remaining_seconds == 6
-    assert parsed.microseconds == 500000
-
-    text = "PT4H54M6,5S"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 0
-    assert parsed.months == 0
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 0
-    assert parsed.hours == 4
-    assert parsed.minutes == 54
-    assert parsed.remaining_seconds == 6
-    assert parsed.microseconds == 500000
-
-    text = "P1Y"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 1
-    assert parsed.months == 0
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 0
-    assert parsed.hours == 0
-    assert parsed.minutes == 0
-    assert parsed.remaining_seconds == 0
-    assert parsed.microseconds == 0
-
-    text = "P1.5Y"
-    with pytest.raises(ValueError):
-        parse_iso8601(text)
-
-    text = "P1,5Y"
-    with pytest.raises(ValueError):
-        parse_iso8601(text)
-
-    text = "P1M"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 0
-    assert parsed.months == 1
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 0
-    assert parsed.hours == 0
-    assert parsed.minutes == 0
-    assert parsed.remaining_seconds == 0
-    assert parsed.microseconds == 0
-
-    text = "P1.5M"
-    with pytest.raises(ValueError):
-        parse_iso8601(text)
-
-    text = "P1,5M"
-    with pytest.raises(ValueError):
-        parse_iso8601(text)
-
-    text = "P1W"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 0
-    assert parsed.months == 0
-    assert parsed.weeks == 1
-    assert parsed.remaining_days == 0
-    assert parsed.hours == 0
-    assert parsed.minutes == 0
-    assert parsed.remaining_seconds == 0
-    assert parsed.microseconds == 0
-
-    text = "P1.5W"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 0
-    assert parsed.months == 0
-    assert parsed.weeks == 1
-    assert parsed.remaining_days == 3
-    assert parsed.hours == 12
-    assert parsed.minutes == 0
-    assert parsed.remaining_seconds == 0
-    assert parsed.microseconds == 0
-
-    text = "P1,5W"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 0
-    assert parsed.months == 0
-    assert parsed.weeks == 1
-    assert parsed.remaining_days == 3
-    assert parsed.hours == 12
-    assert parsed.minutes == 0
-    assert parsed.remaining_seconds == 0
-    assert parsed.microseconds == 0
-
-    text = "P1D"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 0
-    assert parsed.months == 0
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 1
-    assert parsed.hours == 0
-    assert parsed.minutes == 0
-    assert parsed.remaining_seconds == 0
-    assert parsed.microseconds == 0
-
-    text = "P1.5D"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 0
-    assert parsed.months == 0
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 1
-    assert parsed.hours == 12
-    assert parsed.minutes == 0
-    assert parsed.remaining_seconds == 0
-    assert parsed.microseconds == 0
-
-    text = "P1,5D"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 0
-    assert parsed.months == 0
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 1
-    assert parsed.hours == 12
-    assert parsed.minutes == 0
-    assert parsed.remaining_seconds == 0
-    assert parsed.microseconds == 0
-
-    text = "PT1H"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 0
-    assert parsed.months == 0
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 0
-    assert parsed.hours == 1
-    assert parsed.minutes == 0
-    assert parsed.remaining_seconds == 0
-    assert parsed.microseconds == 0
-
-    text = "PT1.5H"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 0
-    assert parsed.months == 0
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 0
-    assert parsed.hours == 1
-    assert parsed.minutes == 30
-    assert parsed.remaining_seconds == 0
-    assert parsed.microseconds == 0
-
-    text = "PT1,5H"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 0
-    assert parsed.months == 0
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 0
-    assert parsed.hours == 1
-    assert parsed.minutes == 30
-    assert parsed.remaining_seconds == 0
-    assert parsed.microseconds == 0
-
-    # Double digit with 0
-    text = "P2Y30M4DT5H6M7S"
-    parsed = parse_iso8601(text)
-
-    assert parsed.years == 2
-    assert parsed.months == 30
-    assert parsed.weeks == 0
-    assert parsed.remaining_days == 4
-    assert parsed.hours == 5
-    assert parsed.minutes == 6
-    assert parsed.remaining_seconds == 7
-    assert parsed.microseconds == 0
-
-    # No P operator
-    with pytest.raises(ValueError):
-        parse_iso8601("2Y3M4DT5H6M7S")
-
-    # Week and other units combined
-    with pytest.raises(ValueError):
-        parse_iso8601("P1Y2W")
-
-    # Invalid units order
-    with pytest.raises(ValueError):
-        parse_iso8601("P1S")
-
-    with pytest.raises(ValueError):
-        parse_iso8601("P1D1S")
-
-    with pytest.raises(ValueError):
-        parse_iso8601("1Y2M3D1SPT1M")
-
-    with pytest.raises(ValueError):
-        parse_iso8601("P1Y2M3D2MT1S")
-
-    with pytest.raises(ValueError):
-        parse_iso8601("P2M3D1ST1Y1M")
-
-    with pytest.raises(ValueError):
-        parse_iso8601("P1Y2M2MT3D1S")
-
-    with pytest.raises(ValueError):
-        parse_iso8601("P1D1Y1M")
-
-    with pytest.raises(ValueError):
-        parse_iso8601("PT1S1H")
-
-    # Invalid
-    with pytest.raises(ValueError):
-        parse_iso8601("P1Dasdfasdf")
-
-    # Invalid fractional
-    with pytest.raises(ValueError):
-        parse_iso8601("P2Y3M4DT5.5H6M7S")
+@pytest.mark.parametrize(
+    ["text", "expected"],
+    [
+        ("P2Y3M4DT5H6M7S", (2, 3, 0, 4, 5, 6, 7, 0)),
+        ("P1Y2M3DT4H5M6.5S", (1, 2, 0, 3, 4, 5, 6, 500_000)),
+        ("P1Y2M3DT4H5M6,5S", (1, 2, 0, 3, 4, 5, 6, 500_000)),
+        ("P1Y2M3D", (1, 2, 0, 3, 0, 0, 0, 0)),
+        ("P1Y2M3.5D", (1, 2, 0, 3, 12, 0, 0, 0)),
+        ("P1Y2M3,5D", (1, 2, 0, 3, 12, 0, 0, 0)),
+        ("PT4H54M6.5S", (0, 0, 0, 0, 4, 54, 6, 500_000)),
+        ("PT4H54M6,5S", (0, 0, 0, 0, 4, 54, 6, 500_000)),
+        ("P1Y", (1, 0, 0, 0, 0, 0, 0, 0)),
+        ("P1M", (0, 1, 0, 0, 0, 0, 0, 0)),
+        ("P1W", (0, 0, 1, 0, 0, 0, 0, 0)),
+        ("P1.5W", (0, 0, 1, 3, 12, 0, 0, 0)),
+        ("P1,5W", (0, 0, 1, 3, 12, 0, 0, 0)),
+        ("P1D", (0, 0, 0, 1, 0, 0, 0, 0)),
+        ("P1.5D", (0, 0, 0, 1, 12, 0, 0, 0)),
+        ("P1,5D", (0, 0, 0, 1, 12, 0, 0, 0)),
+        ("PT1H", (0, 0, 0, 0, 1, 0, 0, 0)),
+        ("PT1.5H", (0, 0, 0, 0, 1, 30, 0, 0)),
+        ("PT1,5H", (0, 0, 0, 0, 1, 30, 0, 0)),
+        ("P2Y30M4DT5H6M7S", (2, 30, 0, 4, 5, 6, 7, 0)),
+    ],
+)
+def test_parse_ios8601_duration(
+    text: str, expected: tuple[int, int, int, int, int, int, int, int]
+) -> None:
+    parsed = parse_iso8601(text)
+
+    assert (
+        parsed.years,
+        parsed.months,
+        parsed.weeks,
+        parsed.remaining_days,
+        parsed.hours,
+        parsed.minutes,
+        parsed.remaining_seconds,
+        parsed.microseconds,
+    ) == expected
diff --git a/tests/parsing/test_parsing.py b/tests/parsing/test_parsing.py
index 35dcf86..d57b82f 100644
--- a/tests/parsing/test_parsing.py
+++ b/tests/parsing/test_parsing.py
@@ -276,19 +276,6 @@ def test_iso8601_datetime():
     assert parsed.microsecond == 0
     assert parsed.utcoffset().total_seconds() == 19800
 
-    text = "20161001T1430,4+0530"
-
-    parsed = parse(text)
-
-    assert parsed.year == 2016
-    assert parsed.month == 10
-    assert parsed.day == 1
-    assert parsed.hour == 14
-    assert parsed.minute == 30
-    assert parsed.second == 0
-    assert parsed.microsecond == 400000
-    assert parsed.utcoffset().total_seconds() == 19800
-
     text = "2008-09-03T20:56:35.450686+01"
 
     parsed = parse(text)
@@ -480,7 +467,7 @@ def test_iso8601_ordinal():
 def test_iso8601_time():
     now = pendulum.datetime(2015, 11, 12)
 
-    text = "201205"
+    text = "T201205"
 
     parsed = parse(text, now=now)
 
diff --git a/tests/test_helpers.py b/tests/test_helpers.py
index e3daeac..e9317b9 100644
--- a/tests/test_helpers.py
+++ b/tests/test_helpers.py
@@ -8,14 +8,22 @@ import pytz
 import pendulum
 
 from pendulum import timezone
+from pendulum.helpers import PreciseDiff
 from pendulum.helpers import days_in_year
 from pendulum.helpers import precise_diff
 from pendulum.helpers import week_day
 
 
 def assert_diff(
-    diff, years=0, months=0, days=0, hours=0, minutes=0, seconds=0, microseconds=0
-):
+    diff: PreciseDiff,
+    years: int = 0,
+    months: int = 0,
+    days: int = 0,
+    hours: int = 0,
+    minutes: int = 0,
+    seconds: int = 0,
+    microseconds: int = 0,
+) -> None:
     assert diff.years == years
     assert diff.months == months
     assert diff.days == days
@@ -25,7 +33,7 @@ def assert_diff(
     assert diff.microseconds == microseconds
 
 
-def test_precise_diff():
+def test_precise_diff() -> None:
     dt1 = datetime(2003, 3, 1, 0, 0, 0)
     dt2 = datetime(2003, 1, 31, 23, 59, 59)
 
@@ -40,6 +48,7 @@ def test_precise_diff():
 
     diff = precise_diff(dt1, dt2)
     assert_diff(diff, months=-1, seconds=-1)
+    assert diff.total_days == -30
 
     diff = precise_diff(dt2, dt1)
     assert_diff(diff, months=1, seconds=1)
@@ -76,7 +85,7 @@ def test_precise_diff():
     assert_diff(diff, days=6, hours=0)
 
 
-def test_precise_diff_timezone():
+def test_precise_diff_timezone() -> None:
     paris = pendulum.timezone("Europe/Paris")
     toronto = pendulum.timezone("America/Toronto")
 
@@ -85,23 +94,26 @@ def test_precise_diff_timezone():
 
     diff = precise_diff(dt1, dt2)
     assert_diff(diff, days=1, hours=0)
+    assert diff.total_days == 1
 
     dt2 = toronto.datetime(2013, 4, 1, 1, 30)
 
     diff = precise_diff(dt1, dt2)
     assert_diff(diff, days=1, hours=5)
+    assert diff.total_days == 1
 
     # pytz
-    paris = pytz.timezone("Europe/Paris")
-    toronto = pytz.timezone("America/Toronto")
+    paris_pytz = pytz.timezone("Europe/Paris")
+    toronto_pytz = pytz.timezone("America/Toronto")
 
-    dt1 = paris.localize(datetime(2013, 3, 31, 1, 30))
-    dt2 = paris.localize(datetime(2013, 4, 1, 1, 30))
+    dt1 = paris_pytz.localize(datetime(2013, 3, 31, 1, 30))
+    dt2 = paris_pytz.localize(datetime(2013, 4, 1, 1, 30))
 
     diff = precise_diff(dt1, dt2)
     assert_diff(diff, days=1, hours=0)
+    assert diff.total_days == 1
 
-    dt2 = toronto.localize(datetime(2013, 4, 1, 1, 30))
+    dt2 = toronto_pytz.localize(datetime(2013, 4, 1, 1, 30))
 
     diff = precise_diff(dt1, dt2)
     assert_diff(diff, days=1, hours=5)
@@ -111,19 +123,20 @@ def test_precise_diff_timezone():
     dt2 = timezone("Europe/Paris").datetime(2018, 6, 20, 3, 40)  # UTC+2
     diff = precise_diff(dt1, dt2)
     assert_diff(diff, minutes=10)
+    assert diff.total_days == 0
 
 
-def test_week_day():
+def test_week_day() -> None:
     assert week_day(2017, 6, 2) == 5
     assert week_day(2017, 1, 1) == 7
 
 
-def test_days_in_years():
+def test_days_in_years() -> None:
     assert days_in_year(2017) == 365
     assert days_in_year(2016) == 366
 
 
-def test_locale():
+def test_locale() -> None:
     dt = pendulum.datetime(2000, 11, 10, 12, 34, 56, 123456)
     pendulum.set_locale("fr")
 
@@ -133,7 +146,7 @@ def test_locale():
     assert dt.date().format("MMMM") == "novembre"
 
 
-def test_set_locale_invalid():
+def test_set_locale_invalid() -> None:
     with pytest.raises(ValueError):
         pendulum.set_locale("invalid")
 
@@ -141,13 +154,13 @@ def test_set_locale_invalid():
 @pytest.mark.parametrize(
     "locale", ["DE", "pt-BR", "pt-br", "PT-br", "PT-BR", "pt_br", "PT_BR", "PT_BR"]
 )
-def test_set_locale_malformed_locale(locale):
+def test_set_locale_malformed_locale(locale: str) -> None:
     pendulum.set_locale(locale)
 
     pendulum.set_locale("en")
 
 
-def test_week_starts_at():
+def test_week_starts_at() -> None:
     pendulum.week_starts_at(pendulum.SATURDAY)
 
     dt = pendulum.now().start_of("week")
@@ -155,15 +168,15 @@ def test_week_starts_at():
     assert dt.date().day_of_week == pendulum.SATURDAY
 
 
-def test_week_starts_at_invalid_value():
+def test_week_starts_at_invalid_value() -> None:
     with pytest.raises(ValueError):
-        pendulum.week_starts_at(-1)
+        pendulum.week_starts_at(-1)  # type: ignore[arg-type]
 
     with pytest.raises(ValueError):
-        pendulum.week_starts_at(11)
+        pendulum.week_starts_at(11)  # type: ignore[arg-type]
 
 
-def test_week_ends_at():
+def test_week_ends_at() -> None:
     pendulum.week_ends_at(pendulum.SATURDAY)
 
     dt = pendulum.now().end_of("week")
@@ -171,9 +184,9 @@ def test_week_ends_at():
     assert dt.date().day_of_week == pendulum.SATURDAY
 
 
-def test_week_ends_at_invalid_value():
+def test_week_ends_at_invalid_value() -> None:
     with pytest.raises(ValueError):
-        pendulum.week_ends_at(-1)
+        pendulum.week_ends_at(-1)  # type: ignore[arg-type]
 
     with pytest.raises(ValueError):
-        pendulum.week_ends_at(11)
+        pendulum.week_ends_at(11)  # type: ignore[arg-type]
diff --git a/tests/test_main.py b/tests/test_main.py
index 1710bf2..011a6b1 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -1,12 +1,62 @@
 from __future__ import annotations
 
+from datetime import date
+from datetime import datetime
+from datetime import time
+
 import pytz
 
+from dateutil import tz
+
+import pendulum
+
 from pendulum import _safe_timezone
+from pendulum import timezone
 from pendulum.tz.timezone import Timezone
 
 
-def test_safe_timezone_with_tzinfo_objects():
+def test_instance_with_naive_datetime_defaults_to_utc() -> None:
+    now = pendulum.instance(datetime.now())
+    assert now.timezone_name == "UTC"
+
+
+def test_instance_with_aware_datetime() -> None:
+    now = pendulum.instance(datetime.now(timezone("Europe/Paris")))
+    assert now.timezone_name == "Europe/Paris"
+
+
+def test_instance_with_aware_datetime_pytz() -> None:
+    now = pendulum.instance(datetime.now(pytz.timezone("Europe/Paris")))
+    assert now.timezone_name == "Europe/Paris"
+
+
+def test_instance_with_aware_datetime_any_tzinfo() -> None:
+    dt = datetime(2016, 8, 7, 12, 34, 56, tzinfo=tz.gettz("Europe/Paris"))
+    now = pendulum.instance(dt)
+    assert now.timezone_name == "+02:00"
+
+
+def test_instance_with_date() -> None:
+    dt = pendulum.instance(date(2022, 12, 23))
+
+    assert isinstance(dt, pendulum.Date)
+
+
+def test_instance_with_naive_time() -> None:
+    dt = pendulum.instance(time(12, 34, 56, 123456))
+
+    assert isinstance(dt, pendulum.Time)
+
+
+def test_instance_with_aware_time() -> None:
+    dt = pendulum.instance(time(12, 34, 56, 123456, tzinfo=timezone("Europe/Paris")))
+
+    assert isinstance(dt, pendulum.Time)
+    assert isinstance(dt.tzinfo, Timezone)
+    assert dt.tzinfo.name == "Europe/Paris"
+
+
+def test_safe_timezone_with_tzinfo_objects() -> None:
     tz = _safe_timezone(pytz.timezone("Europe/Paris"))
 
     assert isinstance(tz, Timezone)
diff --git a/tests/test_parsing.py b/tests/test_parsing.py
index 0e5308c..f01653a 100644
--- a/tests/test_parsing.py
+++ b/tests/test_parsing.py
@@ -8,13 +8,14 @@ from tests.conftest import assert_duration
 from tests.conftest import assert_time
 
 
-def test_parse():
+def test_parse() -> None:
     text = "2016-10-16T12:34:56.123456+01:30"
 
     dt = pendulum.parse(text)
 
     assert isinstance(dt, pendulum.DateTime)
     assert_datetime(dt, 2016, 10, 16, 12, 34, 56, 123456)
+    assert dt.tz is not None
     assert dt.tz.name == "+01:30"
     assert dt.offset == 5400
 
@@ -36,16 +37,18 @@ def test_parse():
     assert dt.offset == 0
 
 
-def test_parse_with_timezone():
+def test_parse_with_timezone() -> None:
     text = "2016-10-16T12:34:56.123456"
 
     dt = pendulum.parse(text, tz="Europe/Paris")
+    assert isinstance(dt, pendulum.DateTime)
     assert_datetime(dt, 2016, 10, 16, 12, 34, 56, 123456)
+    assert dt.tz is not None
     assert dt.tz.name == "Europe/Paris"
     assert dt.offset == 7200
 
 
-def test_parse_exact():
+def test_parse_exact() -> None:
     text = "2016-10-16T12:34:56.123456+01:30"
 
     dt = pendulum.parse(text, exact=True)
@@ -76,7 +79,7 @@ def test_parse_exact():
     assert_time(dt, 13, 0, 0)
 
 
-def test_parse_duration():
+def test_parse_duration() -> None:
     text = "P2Y3M4DT5H6M7S"
 
     duration = pendulum.parse(text)
@@ -92,39 +95,39 @@ def test_parse_duration():
     assert_duration(duration, 0, 0, 2, 0, 0, 0, 0)
 
 
-def test_parse_interval():
+def test_parse_interval() -> None:
     text = "2008-05-11T15:30:00Z/P1Y2M10DT2H30M"
 
-    period = pendulum.parse(text)
+    interval = pendulum.parse(text)
 
-    assert isinstance(period, pendulum.Interval)
-    assert_datetime(period.start, 2008, 5, 11, 15, 30, 0, 0)
-    assert period.start.offset == 0
-    assert_datetime(period.end, 2009, 7, 21, 18, 0, 0, 0)
-    assert period.end.offset == 0
+    assert isinstance(interval, pendulum.Interval)
+    assert_datetime(interval.start, 2008, 5, 11, 15, 30, 0, 0)
+    assert interval.start.offset == 0
+    assert_datetime(interval.end, 2009, 7, 21, 18, 0, 0, 0)
+    assert interval.end.offset == 0
 
     text = "P1Y2M10DT2H30M/2008-05-11T15:30:00Z"
 
-    period = pendulum.parse(text)
+    interval = pendulum.parse(text)
 
-    assert isinstance(period, pendulum.Interval)
-    assert_datetime(period.start, 2007, 3, 1, 13, 0, 0, 0)
-    assert period.start.offset == 0
-    assert_datetime(period.end, 2008, 5, 11, 15, 30, 0, 0)
-    assert period.end.offset == 0
+    assert isinstance(interval, pendulum.Interval)
+    assert_datetime(interval.start, 2007, 3, 1, 13, 0, 0, 0)
+    assert interval.start.offset == 0
+    assert_datetime(interval.end, 2008, 5, 11, 15, 30, 0, 0)
+    assert interval.end.offset == 0
 
     text = "2007-03-01T13:00:00Z/2008-05-11T15:30:00Z"
 
-    period = pendulum.parse(text)
+    interval = pendulum.parse(text)
 
-    assert isinstance(period, pendulum.Interval)
-    assert_datetime(period.start, 2007, 3, 1, 13, 0, 0, 0)
-    assert period.start.offset == 0
-    assert_datetime(period.end, 2008, 5, 11, 15, 30, 0, 0)
-    assert period.end.offset == 0
+    assert isinstance(interval, pendulum.Interval)
+    assert_datetime(interval.start, 2007, 3, 1, 13, 0, 0, 0)
+    assert interval.start.offset == 0
+    assert_datetime(interval.end, 2008, 5, 11, 15, 30, 0, 0)
+    assert interval.end.offset == 0
 
 
-def test_parse_now():
+def test_parse_now() -> None:
     dt = pendulum.parse("now")
 
     assert dt.timezone_name == "America/Toronto"
@@ -135,7 +138,7 @@ def test_parse_now():
         assert pendulum.parse("now") == mock_now
 
 
-def test_parse_with_utc_timezone():
+def test_parse_with_utc_timezone() -> None:
     dt = pendulum.parse("2020-02-05T20:05:37.364951Z")
 
     assert dt.to_iso8601_string() == "2020-02-05T20:05:37.364951Z"
diff --git a/tests/testing/test_time_travel.py b/tests/testing/test_time_travel.py
index dd496e3..5e7a49b 100644
--- a/tests/testing/test_time_travel.py
+++ b/tests/testing/test_time_travel.py
@@ -9,6 +9,7 @@ import pendulum
 
 from pendulum.utils._compat import PYPY
 
+
 if TYPE_CHECKING:
     from typing import Generator
 
diff --git a/tests/time/test_comparison.py b/tests/time/test_comparison.py
index f1ef275..23dd176 100644
--- a/tests/time/test_comparison.py
+++ b/tests/time/test_comparison.py
@@ -28,7 +28,7 @@ def test_equal_to_false():
 def test_not_equal_to_none():
     t1 = pendulum.time(1, 2, 3)
 
-    assert t1 != None  # noqa
+    assert t1 is not None
 
 
 def test_greater_than_true():
diff --git a/tests/tz/test_helpers.py b/tests/tz/test_helpers.py
index edec6fd..9402372 100644
--- a/tests/tz/test_helpers.py
+++ b/tests/tz/test_helpers.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import pytest
 
-from pendulum.tz import timezone
+from pendulum import timezone
 from pendulum.tz.exceptions import InvalidTimezone
 from pendulum.tz.timezone import FixedTimezone
 from pendulum.tz.timezone import Timezone
diff --git a/tests/tz/test_timezone.py b/tests/tz/test_timezone.py
index 655267d..792beb0 100644
--- a/tests/tz/test_timezone.py
+++ b/tests/tz/test_timezone.py
@@ -274,7 +274,10 @@ def test_after_last_transition():
 
 
 @pytest.mark.skip(
-    reason="zoneinfo does not currently support POSIX transition rules to go beyond the last fixed transition."
+    reason=(
+        "zoneinfo does not currently support POSIX transition"
+        " rules to go beyond the last fixed transition."
+    )
 )
 def test_on_last_transition():
     tz = pendulum.timezone("Europe/Paris")
@@ -406,7 +409,10 @@ def test_just_before_last_transition():
 
 
 @pytest.mark.skip(
-    reason="zoneinfo does not currently support POSIX transition rules to go beyond the last fixed transition."
+    reason=(
+        "zoneinfo does not currently support POSIX transition"
+        " rules to go beyond the last fixed transition."
+    )
 )
 def test_timezones_are_extended():
     tz = pendulum.timezone("Europe/Paris")