tempo/year
Functions to use with years in Tempo. Years are pretty simple thankfully.
All functions in this module interpret years as
proleptic Gregorian calendar
years, meaning the Gregorian rules are applied to every year including
those before the calendar’s 1582 adoption. They accept any year value, not
just the 1000 to 9999 range that the tempo/date constructors are limited
to.
Values
pub fn days(of year: Int) -> IntGet the number of days in a proleptic Gregorian calendar year, so always
365 or 366. Accounts for leap years using the Gregorian rules described in
is_leap_year.
Any year value is accepted, not just the 1000 to 9999 range that the
tempo/date constructors are limited to.
Examples
year.days(2024)
// -> 366
year.days(2025)
// -> 365
pub fn is_leap_year(year: Int) -> BoolChecks if a year is a leap year, according to the proleptic Gregorian calendar: a year is a leap year when it is divisible by 4, except for century years, which must be divisible by 400.
Any year value is accepted, including years before the Gregorian calendar was adopted in 1582, for which the Gregorian rules are applied anyway. This is not a historical claim about the Julian calendar those years were actually recorded in, where every fourth year was a leap year with no century exception.
Examples
year.is_leap_year(2024)
// -> True
year.is_leap_year(2025)
// -> False
// A century year not divisible by 400 is not a leap year
year.is_leap_year(1900)
// -> False