Primitive weekday helpers.

The helpers here compute weekdays deterministically from Gregorian dates.

Examples

use use_weekday::{Weekday, is_weekend, weekday_for_date};

let weekday = weekday_for_date(2024, 5, 17).unwrap();

assert_eq!(weekday, Weekday::Friday);
assert_eq!(weekday.number_from_monday(), 5);
assert!(!is_weekend(weekday));