Function `days_in_month`

const fn days_in_month(month: u8, year: i32) -> u8

Get the number of days in the month of a given year.

# use time_core::util::days_in_month;
assert_eq!(days_in_month(2, 2020), 29);

Note: This function is not exposed by the time crate. It is an implementation detail.