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src/tempo/year.gleam
/// Checks if a year is a leap year.
///
/// ## Examples
///
/// ```gleam
/// year.is_leap_year(2024)
/// // -> True
/// ```
///
/// ```gleam
/// year.is_leap_year(2025)
/// // -> False
/// ```
pub fn is_leap_year(year: Int) -> Bool {
case year % 4 == 0 {
True ->
case year % 100 == 0 {
True ->
case year % 400 == 0 {
True -> True
False -> False
}
False -> True
}
False -> False
}
}
/// Get the number of days in a year. Accounts for leap years.
///
/// ## Examples
///
/// ```gleam
/// year.days(2024)
/// // -> 366
/// ```
///
/// ```gleam
/// year.days(2025)
/// // -> 365
/// ```
pub fn days(of year: Int) -> Int {
case is_leap_year(year) {
True -> 366
False -> 365
}
}