Merge pull request #252 from quodlibetor/negative-timestamps
Add doctests around negative timestamps
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commit
369ce72987
11
src/lib.rs
11
src/lib.rs
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@ -884,7 +884,16 @@ pub trait Datelike: Sized {
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/// Returns `None` when the resulting value would be invalid.
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fn with_ordinal0(&self, ordinal0: u32) -> Option<Self>;
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/// Returns the number of days since January 1, 1 (Day 1) in the proleptic Gregorian calendar.
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/// Returns the number of days since January 1, Year 1 (aka Day 1) in the
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/// proleptic Gregorian calendar.
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///
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/// # Example:
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///
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/// ~~~
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/// use chrono::{NaiveDate, Datelike};
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/// assert_eq!(NaiveDate::from_ymd(1970, 1, 1).num_days_from_ce(), 719163);
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/// assert_eq!(NaiveDate::from_ymd(0, 1, 1).num_days_from_ce(), -365);
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/// ~~~
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fn num_days_from_ce(&self) -> i32 {
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// we know this wouldn't overflow since year is limited to 1/2^13 of i32's full range.
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let mut year = self.year() - 1;
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@ -255,12 +255,19 @@ impl NaiveDateTime {
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///
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/// let dt = NaiveDate::from_ymd(2001, 9, 9).and_hms(1, 46, 40);
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/// assert_eq!(dt.timestamp(), 1_000_000_000);
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///
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/// let dt = NaiveDate::from_ymd(1969, 12, 31).and_hms(23, 59, 59);
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/// assert_eq!(dt.timestamp(), -1);
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///
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/// let dt = NaiveDate::from_ymd(-1, 1, 1).and_hms(0, 0, 0);
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/// assert_eq!(dt.timestamp(), -62198755200);
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/// ~~~~
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#[inline]
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pub fn timestamp(&self) -> i64 {
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let ndays = i64::from(self.date.num_days_from_ce());
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let nseconds = i64::from(self.time.num_seconds_from_midnight());
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(ndays - 719_163) * 86_400 + nseconds
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const UNIX_EPOCH_DAY: i64 = 719_163;
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let gregorian_day = i64::from(self.date.num_days_from_ce());
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let seconds_from_midnight = i64::from(self.time.num_seconds_from_midnight());
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(gregorian_day - UNIX_EPOCH_DAY) * 86_400 + seconds_from_midnight
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}
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/// Returns the number of non-leap *milliseconds* since midnight on January 1, 1970.
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@ -283,6 +290,9 @@ impl NaiveDateTime {
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///
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/// let dt = NaiveDate::from_ymd(2001, 9, 9).and_hms_milli(1, 46, 40, 555);
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/// assert_eq!(dt.timestamp_millis(), 1_000_000_000_555);
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///
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/// let dt = NaiveDate::from_ymd(1969, 12, 31).and_hms_milli(23, 59, 59, 100);
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/// assert_eq!(dt.timestamp_millis(), -900);
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/// ~~~~
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#[inline]
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pub fn timestamp_millis(&self) -> i64 {
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@ -475,7 +475,7 @@ mod tests {
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use Weekday;
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use super::{Of, Mdf};
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use super::{YearFlags, A, B, C, D, E, F, G, AG, BA, CB, DC, ED, FE, GF};
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use num_iter::range_inclusive;
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use self::num_iter::range_inclusive;
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use std::u32;
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const NONLEAP_FLAGS: [YearFlags; 7] = [A, B, C, D, E, F, G];
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