1 files changed, 80 insertions, 0 deletions
diff --git a/rust/vendor/time/src/util.rs b/rust/vendor/time/src/util.rs
new file mode 100644
index 0000000..3735b0b
--- /dev/null
+++ b/rust/vendor/time/src/util.rs
@@ -0,0 +1,80 @@
+//! Utility functions.
+
+use crate::Month;
+
+/// Whether to adjust the date, and in which direction. Useful when implementing arithmetic.
+pub(crate) enum DateAdjustment {
+    /// The previous day should be used.
+    Previous,
+    /// The next day should be used.
+    Next,
+    /// The date should be used as-is.
+    None,
+}
+
+/// Get the number of days in the month of a given year.
+///
+/// ```rust
+/// # use time::{Month, util};
+/// assert_eq!(util::days_in_year_month(2020, Month::February), 29);
+/// ```
+pub const fn days_in_year_month(year: i32, month: Month) -> u8 {
+    use Month::*;
+    match month {
+        January | March | May | July | August | October | December => 31,
+        April | June | September | November => 30,
+        February if is_leap_year(year) => 29,
+        February => 28,
+    }
+}
+
+/// 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,
+    }
+}