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[Chrono][docsrs]: Timezone-aware date and time handling
========================================
[![Chrono GitHub Actions][gh-image]][gh-checks]
[![Chrono on crates.io][cratesio-image]][cratesio]
[![Chrono on docs.rs][docsrs-image]][docsrs]
[![Join the chat at https://gitter.im/chrono-rs/chrono][gitter-image]][gitter]
[gh-image]: https://github.com/chronotope/chrono/actions/workflows/test.yml/badge.svg
[gh-checks]: https://github.com/chronotope/chrono/actions?query=workflow%3Atest
[cratesio-image]: https://img.shields.io/crates/v/chrono.svg
[cratesio]: https://crates.io/crates/chrono
[docsrs-image]: https://docs.rs/chrono/badge.svg
[docsrs]: https://docs.rs/chrono
[gitter-image]: https://badges.gitter.im/chrono-rs/chrono.svg
[gitter]: https://gitter.im/chrono-rs/chrono
Chrono aims to provide all functionality needed to do correct operations on dates and times in the
[proleptic Gregorian calendar](https://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar):
* The [`DateTime`](https://docs.rs/chrono/latest/chrono/struct.DateTime.html) type is timezone-aware
by default, with separate timezone-naive types.
* Operations that may produce an invalid or ambiguous date and time return `Option` or
[`LocalResult`](https://docs.rs/chrono/latest/chrono/offset/enum.LocalResult.html).
* Configurable parsing and formatting with an `strftime` inspired date and time formatting syntax.
* The [`Local`](https://docs.rs/chrono/latest/chrono/offset/struct.Local.html) timezone works with
the current timezone of the OS.
* Types and operations are implemented to be reasonably efficient.
Timezone data is not shipped with chrono by default to limit binary sizes. Use the companion crate
[Chrono-TZ](https://crates.io/crates/chrono-tz) or [`tzfile`](https://crates.io/crates/tzfile) for
full timezone support.
## Documentation
See [docs.rs](https://docs.rs/chrono/latest/chrono/) for the API reference.
## Limitations
* Only the proleptic Gregorian calendar (i.e. extended to support older dates) is supported.
* Date types are limited to about +/- 262,000 years from the common epoch.
* Time types are limited to nanosecond accuracy.
* Leap seconds can be represented, but Chrono does not fully support them.
See [Leap Second Handling](https://docs.rs/chrono/latest/chrono/naive/struct.NaiveTime.html#leap-second-handling).
## Crate features
Default features:
* `alloc`: Enable features that depend on allocation (primarily string formatting)
* `std`: Enables functionality that depends on the standard library. This is a superset of `alloc`
and adds interoperation with standard library types and traits.
* `clock`: Enables reading the system time (`now`) and local timezone (`Local`).
* `wasmbind`: Interface with the JS Date API for the `wasm32` target.
Optional features:
* `serde`: Enable serialization/deserialization via serde.
* `rkyv`: Enable serialization/deserialization via rkyv.
* `rustc-serialize`: Enable serialization/deserialization via rustc-serialize (deprecated).
* `old_time`: compatability with the `Duration` type of the `time` 0.1 crate (deprecated).
* `arbitrary`: construct arbitrary instances of a type with the Arbitrary crate.
* `unstable-locales`: Enable localization. This adds various methods with a `_localized` suffix.
The implementation and API may change or even be removed in a patch release. Feedback welcome.
## Rust version requirements
The Minimum Supported Rust Version (MSRV) is currently **Rust 1.56.0**.
The MSRV is explicitly tested in CI. It may be bumped in minor releases, but this is not done
lightly.
## License
This project is licensed under either of
* [Apache License, Version 2.0](https://www.apache.org/licenses/LICENSE-2.0)
* [MIT License](https://opensource.org/licenses/MIT)
at your option.
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