polars_time/windows/
calendar.rs

1pub(crate) const DAYS_PER_MONTH: [[i64; 12]; 2] = [
2    //J   F   M   A   M   J   J   A   S   O   N   D
3    [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31], // non-leap year
4    [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31], // leap year
5];
6
7pub(crate) const fn is_leap_year(year: i32) -> bool {
8    year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)
9}
10
11/// Get the number of days in the given month of the given year
12pub(crate) const fn days_in_month(year: i32, month: u8) -> u8 {
13    DAYS_PER_MONTH[is_leap_year(year) as usize][(month - 1) as usize] as u8
14}
15
16/// nanoseconds per unit
17pub const NS_MICROSECOND: i64 = 1_000;
18pub const NS_MILLISECOND: i64 = 1_000_000;
19pub const NS_SECOND: i64 = 1_000_000_000;
20pub const NS_MINUTE: i64 = 60 * NS_SECOND;
21pub const NS_HOUR: i64 = 60 * NS_MINUTE;
22pub const NS_DAY: i64 = 24 * NS_HOUR;
23pub const NS_WEEK: i64 = 7 * NS_DAY;
24
25/// Not-to-exceed (NTE) nanoseconds per unit, accounting for DST.
26/// This is an upper bound. Leap seconds do not matter for correctness.
27pub const NTE_NS_DAY: i64 = (24 + 1) * NS_HOUR + 1;
28pub const NTE_NS_WEEK: i64 = 6 * NS_DAY + NTE_NS_DAY;
polars_time/windows/calendar.rs

polars_time/windows/
calendar.rs
