diff options
Diffstat (limited to 'src/date.rs')
| -rw-r--r-- | src/date.rs | 29 |
1 files changed, 20 insertions, 9 deletions
diff --git a/src/date.rs b/src/date.rs index 43355ab..3691a7b 100644 --- a/src/date.rs +++ b/src/date.rs @@ -39,6 +39,9 @@ impl Date { /// The latest date which can be represented pub const MAX: Self = unsafe { Self::from_ymd_unchecked(Year::MAX, Month::December, 31) }; + pub const UNIX_EPOCH: Self = + unsafe { Self::from_ymd_unchecked(Year::from_i16(1970), Month::January, 1) }; + // TODO validated from_calendar_date /// Creates a date without checking to make sure that it's valid. @@ -56,24 +59,29 @@ impl Date { /// # Safety /// /// This function results in undefined behavior if the given date is not a real date + #[must_use] pub const unsafe fn from_ymd_unchecked(year: Year, month: Month, day: u8) -> Self { Self { year, month, day } } // TODO docs + #[must_use] pub const fn year(self) -> Year { self.year } + #[must_use] pub const fn month(self) -> Month { self.month } + #[must_use] pub const fn day(self) -> u8 { self.day } + #[must_use] pub const fn is_leap_year(self) -> bool { self.year.is_leap_year() } @@ -115,18 +123,21 @@ impl Date { } // TODO handle BCE properly - pub const fn days_after_common_era(self) -> isize { + #[must_use] + pub const fn days_after_common_era(self) -> i64 { let year = self.year.wrapping_sub(1); - let leap_years = (year.as_i16() / 4 - year.as_i16() / 100 + year.as_i16() / 400) as isize; - let month_last_day_ordinal = self.month.last_day_ordinal(self.is_leap_year()) as isize; + let leap_years = (year.as_i16() / 4 - year.as_i16() / 100 + year.as_i16() / 400) as i64; + let month_last_day_ordinal = + self.month.previous().last_day_ordinal(self.is_leap_year()) as i64; - year.as_i16() as isize * 365 + leap_years + month_last_day_ordinal + self.day as isize - 1 + year.as_i16() as i64 * 365 + leap_years + month_last_day_ordinal + self.day as i64 - 1 } // TODO test - pub const fn from_days_after_common_era(days: isize) -> Self { - let era = days / 146097; // an era is a period of 400 year - let day_of_era = days - (era * 146097); + #[must_use] + pub const fn from_days_after_common_era(days: i64) -> Self { + let era = days / 146_097; // an era is a period of 400 year + let day_of_era = days - (era * 146_097); let year_of_era = day_of_era / 365; let year = year_of_era + (era * 400); let ordinal = day_of_era - (365 * year + year / 4 - year / 100); @@ -140,7 +151,7 @@ impl Date { } #[must_use] - pub const fn add_days(self, days: isize) -> Self { + pub const fn add_days(self, days: i64) -> Self { let total_days_since_ce = self.days_after_common_era() + days; Self::from_days_after_common_era(total_days_since_ce) } @@ -192,7 +203,7 @@ impl Display for Date { self.year, self.month as u8, self.day, - width = 4 + (self.year() < 0.into()) as usize + width = 4 + usize::from(self.year() < 0.into()) ) } } |