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some more docs for NaiveDate.

This commit is contained in:
Kang Seonghoon 2015-05-03 14:38:27 +09:00
parent e08f0849dc
commit 6d4054a3a7
1 changed files with 30 additions and 1 deletions
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31
src/naive/date.rs
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@ -156,6 +156,20 @@ impl NaiveDate {
/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
///
/// Returns `None` on the out-of-range date and/or invalid DOY.
///
/// # Example
///
/// ~~~~
/// use chrono::NaiveDate;
///
/// assert!(NaiveDate::from_yo_opt(2015, 100).is_some());
/// assert!(NaiveDate::from_yo_opt(2015, 0).is_none());
/// assert!(NaiveDate::from_yo_opt(2015, 365).is_some());
/// assert!(NaiveDate::from_yo_opt(2015, 366).is_none());
/// assert!(NaiveDate::from_yo_opt(-4, 366).is_some()); // 5 BCE is a leap year
/// assert!(NaiveDate::from_yo_opt(400000, 1).is_none());
/// assert!(NaiveDate::from_yo_opt(-400000, 1).is_none());
/// ~~~~
pub fn from_yo_opt(year: i32, ordinal: u32) -> Option<NaiveDate> {
let flags = YearFlags::from_year(year);
NaiveDate::from_of(year, Of::new(ordinal, flags))
@ -242,8 +256,23 @@ impl NaiveDate {
/// in the proleptic Gregorian calendar.
///
/// Returns `None` on the out-of-range date.
///
/// # Example
///
/// ~~~~
/// use chrono::NaiveDate;
///
/// assert_eq!(NaiveDate::from_num_days_from_ce_opt(730000),
/// Some(NaiveDate::from_ymd(1999, 9, 3)));
/// assert_eq!(NaiveDate::from_num_days_from_ce_opt(1),
/// Some(NaiveDate::from_ymd(1, 1, 1)));
/// assert_eq!(NaiveDate::from_num_days_from_ce_opt(0),
/// Some(NaiveDate::from_ymd(0, 12, 31)));
/// assert_eq!(NaiveDate::from_num_days_from_ce_opt(100000000), None);
/// assert_eq!(NaiveDate::from_num_days_from_ce_opt(-100000000), None);
/// ~~~~
pub fn from_num_days_from_ce_opt(days: i32) -> Option<NaiveDate> {
let days = days + 365; // make January 1, 1 BCE equal to day 0
let days = days + 365; // make December 31, 1 BCE equal to day 0
let (year_div_400, cycle) = div_mod_floor(days, 146097);
let (year_mod_400, ordinal) = internals::cycle_to_yo(cycle as u32);
let flags = YearFlags::from_year_mod_400(year_mod_400 as i32);