2 files changed, 104 insertions, 0 deletions
diff --git a/third_party/rust/time-core/src/lib.rs b/third_party/rust/time-core/src/lib.rs
new file mode 100644
index 0000000000..d962578b59
--- /dev/null
+++ b/third_party/rust/time-core/src/lib.rs
@@ -0,0 +1,52 @@
+//! Core items for `time`.
+//!
+//! This crate is an implementation detail of `time` and should not be relied upon directly.
+
+#![no_std]
+#![deny(
+    anonymous_parameters,
+    clippy::all,
+    clippy::alloc_instead_of_core,
+    clippy::explicit_auto_deref,
+    clippy::obfuscated_if_else,
+    clippy::std_instead_of_core,
+    clippy::undocumented_unsafe_blocks,
+    const_err,
+    illegal_floating_point_literal_pattern,
+    late_bound_lifetime_arguments,
+    path_statements,
+    patterns_in_fns_without_body,
+    rust_2018_idioms,
+    trivial_casts,
+    trivial_numeric_casts,
+    unreachable_pub,
+    unsafe_op_in_unsafe_fn,
+    unused_extern_crates,
+    rustdoc::broken_intra_doc_links,
+    rustdoc::private_intra_doc_links
+)]
+#![warn(
+    clippy::dbg_macro,
+    clippy::decimal_literal_representation,
+    clippy::get_unwrap,
+    clippy::missing_docs_in_private_items,
+    clippy::nursery,
+    clippy::print_stdout,
+    clippy::todo,
+    clippy::unimplemented,
+    clippy::unnested_or_patterns,
+    clippy::unwrap_in_result,
+    clippy::unwrap_used,
+    clippy::use_debug,
+    deprecated_in_future,
+    missing_copy_implementations,
+    missing_debug_implementations,
+    unused_qualifications,
+    variant_size_differences
+)]
+#![allow(clippy::redundant_pub_crate)]
+#![doc(html_favicon_url = "https://avatars0.githubusercontent.com/u/55999857")]
+#![doc(html_logo_url = "https://avatars0.githubusercontent.com/u/55999857")]
+#![doc(test(attr(deny(warnings))))]
+
+pub mod util;
diff --git a/third_party/rust/time-core/src/util.rs b/third_party/rust/time-core/src/util.rs
new file mode 100644
index 0000000000..26ced0638c
--- /dev/null
+++ b/third_party/rust/time-core/src/util.rs
@@ -0,0 +1,52 @@
+//! Utility functions.
+
+/// Returns if the provided year is a leap year in the proleptic Gregorian calendar. Uses
+/// [astronomical year numbering](https://en.wikipedia.org/wiki/Astronomical_year_numbering).
+///
+/// ```rust
+/// # use time::util::is_leap_year;
+/// assert!(!is_leap_year(1900));
+/// assert!(is_leap_year(2000));
+/// assert!(is_leap_year(2004));
+/// assert!(!is_leap_year(2005));
+/// assert!(!is_leap_year(2100));
+/// ```
+pub const fn is_leap_year(year: i32) -> bool {
+    year % 4 == 0 && (year % 25 != 0 || year % 16 == 0)
+}
+
+/// Get the number of calendar days in a given year.
+///
+/// The returned value will always be either 365 or 366.
+///
+/// ```rust
+/// # use time::util::days_in_year;
+/// assert_eq!(days_in_year(1900), 365);
+/// assert_eq!(days_in_year(2000), 366);
+/// assert_eq!(days_in_year(2004), 366);
+/// assert_eq!(days_in_year(2005), 365);
+/// assert_eq!(days_in_year(2100), 365);
+/// ```
+pub const fn days_in_year(year: i32) -> u16 {
+    if is_leap_year(year) { 366 } else { 365 }
+}
+
+/// Get the number of weeks in the ISO year.
+///
+/// The returned value will always be either 52 or 53.
+///
+/// ```rust
+/// # use time::util::weeks_in_year;
+/// assert_eq!(weeks_in_year(2019), 52);
+/// assert_eq!(weeks_in_year(2020), 53);
+/// ```
+pub const fn weeks_in_year(year: i32) -> u8 {
+    match year.rem_euclid(400) {
+        4 | 9 | 15 | 20 | 26 | 32 | 37 | 43 | 48 | 54 | 60 | 65 | 71 | 76 | 82 | 88 | 93 | 99
+        | 105 | 111 | 116 | 122 | 128 | 133 | 139 | 144 | 150 | 156 | 161 | 167 | 172 | 178
+        | 184 | 189 | 195 | 201 | 207 | 212 | 218 | 224 | 229 | 235 | 240 | 246 | 252 | 257
+        | 263 | 268 | 274 | 280 | 285 | 291 | 296 | 303 | 308 | 314 | 320 | 325 | 331 | 336
+        | 342 | 348 | 353 | 359 | 364 | 370 | 376 | 381 | 387 | 392 | 398 => 53,
+        _ => 52,
+    }
+}