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diff --git a/src/naive/date.rs b/src/naive/date.rs new file mode 100644 index 0000000..3e34e20 --- /dev/null +++ b/src/naive/date.rs @@ -0,0 +1,2392 @@ +// This is a part of Chrono. +// See README.md and LICENSE.txt for details. + +//! ISO 8601 calendar date without timezone. + +#[cfg(any(feature = "alloc", feature = "std", test))] +use core::borrow::Borrow; +use core::ops::{Add, AddAssign, Sub, SubAssign}; +use core::{fmt, str}; +use num_traits::ToPrimitive; +use oldtime::Duration as OldDuration; + +use div::div_mod_floor; +#[cfg(any(feature = "alloc", feature = "std", test))] +use format::DelayedFormat; +use format::{parse, ParseError, ParseResult, Parsed, StrftimeItems}; +use format::{Item, Numeric, Pad}; +use naive::{IsoWeek, NaiveDateTime, NaiveTime}; +use {Datelike, Weekday}; + +use super::internals::{self, DateImpl, Mdf, Of, YearFlags}; +use super::isoweek; + +const MAX_YEAR: i32 = internals::MAX_YEAR; +const MIN_YEAR: i32 = internals::MIN_YEAR; + +// MAX_YEAR-12-31 minus 0000-01-01 +// = ((MAX_YEAR+1)-01-01 minus 0001-01-01) + (0001-01-01 minus 0000-01-01) - 1 day +// = ((MAX_YEAR+1)-01-01 minus 0001-01-01) + 365 days +// = MAX_YEAR * 365 + (# of leap years from 0001 to MAX_YEAR) + 365 days +#[cfg(test)] // only used for testing +const MAX_DAYS_FROM_YEAR_0: i32 = + MAX_YEAR * 365 + MAX_YEAR / 4 - MAX_YEAR / 100 + MAX_YEAR / 400 + 365; + +// MIN_YEAR-01-01 minus 0000-01-01 +// = (MIN_YEAR+400n+1)-01-01 minus (400n+1)-01-01 +// = ((MIN_YEAR+400n+1)-01-01 minus 0001-01-01) - ((400n+1)-01-01 minus 0001-01-01) +// = ((MIN_YEAR+400n+1)-01-01 minus 0001-01-01) - 146097n days +// +// n is set to 1000 for convenience. +#[cfg(test)] // only used for testing +const MIN_DAYS_FROM_YEAR_0: i32 = (MIN_YEAR + 400_000) * 365 + (MIN_YEAR + 400_000) / 4 + - (MIN_YEAR + 400_000) / 100 + + (MIN_YEAR + 400_000) / 400 + - 146097_000; + +#[cfg(test)] // only used for testing, but duplicated in naive::datetime +const MAX_BITS: usize = 44; + +/// ISO 8601 calendar date without timezone. +/// Allows for every [proleptic Gregorian date](#calendar-date) +/// from Jan 1, 262145 BCE to Dec 31, 262143 CE. +/// Also supports the conversion from ISO 8601 ordinal and week date. +/// +/// # Calendar Date +/// +/// The ISO 8601 **calendar date** follows the proleptic Gregorian calendar. +/// It is like a normal civil calendar but note some slight differences: +/// +/// * Dates before the Gregorian calendar's inception in 1582 are defined via the extrapolation. +/// Be careful, as historical dates are often noted in the Julian calendar and others +/// and the transition to Gregorian may differ across countries (as late as early 20C). +/// +/// (Some example: Both Shakespeare from Britain and Cervantes from Spain seemingly died +/// on the same calendar date---April 23, 1616---but in the different calendar. +/// Britain used the Julian calendar at that time, so Shakespeare's death is later.) +/// +/// * ISO 8601 calendars has the year 0, which is 1 BCE (a year before 1 CE). +/// If you need a typical BCE/BC and CE/AD notation for year numbers, +/// use the [`Datelike::year_ce`](../trait.Datelike.html#method.year_ce) method. +/// +/// # Week Date +/// +/// The ISO 8601 **week date** is a triple of year number, week number +/// and [day of the week](../enum.Weekday.html) with the following rules: +/// +/// * A week consists of Monday through Sunday, and is always numbered within some year. +/// The week number ranges from 1 to 52 or 53 depending on the year. +/// +/// * The week 1 of given year is defined as the first week containing January 4 of that year, +/// or equivalently, the first week containing four or more days in that year. +/// +/// * The year number in the week date may *not* correspond to the actual Gregorian year. +/// For example, January 3, 2016 (Sunday) was on the last (53rd) week of 2015. +/// +/// Chrono's date types default to the ISO 8601 [calendar date](#calendar-date), +/// but [`Datelike::iso_week`](../trait.Datelike.html#tymethod.iso_week) and +/// [`Datelike::weekday`](../trait.Datelike.html#tymethod.weekday) methods +/// can be used to get the corresponding week date. +/// +/// # Ordinal Date +/// +/// The ISO 8601 **ordinal date** is a pair of year number and day of the year ("ordinal"). +/// The ordinal number ranges from 1 to 365 or 366 depending on the year. +/// The year number is the same as that of the [calendar date](#calendar-date). +/// +/// This is currently the internal format of Chrono's date types. +#[derive(PartialEq, Eq, Hash, PartialOrd, Ord, Copy, Clone)] +pub struct NaiveDate { + ymdf: DateImpl, // (year << 13) | of +} + +/// The minimum possible `NaiveDate` (January 1, 262145 BCE). +pub const MIN_DATE: NaiveDate = NaiveDate { ymdf: (MIN_YEAR << 13) | (1 << 4) | 0o07 /*FE*/ }; +/// The maximum possible `NaiveDate` (December 31, 262143 CE). +pub const MAX_DATE: NaiveDate = NaiveDate { ymdf: (MAX_YEAR << 13) | (365 << 4) | 0o17 /*F*/ }; + +// as it is hard to verify year flags in `MIN_DATE` and `MAX_DATE`, +// we use a separate run-time test. +#[test] +fn test_date_bounds() { + let calculated_min = NaiveDate::from_ymd(MIN_YEAR, 1, 1); + let calculated_max = NaiveDate::from_ymd(MAX_YEAR, 12, 31); + assert!( + MIN_DATE == calculated_min, + "`MIN_DATE` should have a year flag {:?}", + calculated_min.of().flags() + ); + assert!( + MAX_DATE == calculated_max, + "`MAX_DATE` should have a year flag {:?}", + calculated_max.of().flags() + ); + + // let's also check that the entire range do not exceed 2^44 seconds + // (sometimes used for bounding `Duration` against overflow) + let maxsecs = MAX_DATE.signed_duration_since(MIN_DATE).num_seconds(); + let maxsecs = maxsecs + 86401; // also take care of DateTime + assert!( + maxsecs < (1 << MAX_BITS), + "The entire `NaiveDate` range somehow exceeds 2^{} seconds", + MAX_BITS + ); +} + +impl NaiveDate { + /// Makes a new `NaiveDate` from year and packed ordinal-flags, with a verification. + fn from_of(year: i32, of: Of) -> Option<NaiveDate> { + if year >= MIN_YEAR && year <= MAX_YEAR && of.valid() { + let Of(of) = of; + Some(NaiveDate { ymdf: (year << 13) | (of as DateImpl) }) + } else { + None + } + } + + /// Makes a new `NaiveDate` from year and packed month-day-flags, with a verification. + fn from_mdf(year: i32, mdf: Mdf) -> Option<NaiveDate> { + NaiveDate::from_of(year, mdf.to_of()) + } + + /// Makes a new `NaiveDate` from the [calendar date](#calendar-date) + /// (year, month and day). + /// + /// Panics on the out-of-range date, invalid month and/or day. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike, Weekday}; + /// + /// let d = NaiveDate::from_ymd(2015, 3, 14); + /// assert_eq!(d.year(), 2015); + /// assert_eq!(d.month(), 3); + /// assert_eq!(d.day(), 14); + /// assert_eq!(d.ordinal(), 73); // day of year + /// assert_eq!(d.iso_week().year(), 2015); + /// assert_eq!(d.iso_week().week(), 11); + /// assert_eq!(d.weekday(), Weekday::Sat); + /// assert_eq!(d.num_days_from_ce(), 735671); // days since January 1, 1 CE + /// ~~~~ + pub fn from_ymd(year: i32, month: u32, day: u32) -> NaiveDate { + NaiveDate::from_ymd_opt(year, month, day).expect("invalid or out-of-range date") + } + + /// Makes a new `NaiveDate` from the [calendar date](#calendar-date) + /// (year, month and day). + /// + /// Returns `None` on the out-of-range date, invalid month and/or day. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// + /// let from_ymd_opt = NaiveDate::from_ymd_opt; + /// + /// assert!(from_ymd_opt(2015, 3, 14).is_some()); + /// assert!(from_ymd_opt(2015, 0, 14).is_none()); + /// assert!(from_ymd_opt(2015, 2, 29).is_none()); + /// assert!(from_ymd_opt(-4, 2, 29).is_some()); // 5 BCE is a leap year + /// assert!(from_ymd_opt(400000, 1, 1).is_none()); + /// assert!(from_ymd_opt(-400000, 1, 1).is_none()); + /// ~~~~ + pub fn from_ymd_opt(year: i32, month: u32, day: u32) -> Option<NaiveDate> { + let flags = YearFlags::from_year(year); + NaiveDate::from_mdf(year, Mdf::new(month, day, flags)) + } + + /// Makes a new `NaiveDate` from the [ordinal date](#ordinal-date) + /// (year and day of the year). + /// + /// Panics on the out-of-range date and/or invalid day of year. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike, Weekday}; + /// + /// let d = NaiveDate::from_yo(2015, 73); + /// assert_eq!(d.ordinal(), 73); + /// assert_eq!(d.year(), 2015); + /// assert_eq!(d.month(), 3); + /// assert_eq!(d.day(), 14); + /// assert_eq!(d.iso_week().year(), 2015); + /// assert_eq!(d.iso_week().week(), 11); + /// assert_eq!(d.weekday(), Weekday::Sat); + /// assert_eq!(d.num_days_from_ce(), 735671); // days since January 1, 1 CE + /// ~~~~ + pub fn from_yo(year: i32, ordinal: u32) -> NaiveDate { + NaiveDate::from_yo_opt(year, ordinal).expect("invalid or out-of-range date") + } + + /// Makes a new `NaiveDate` from the [ordinal date](#ordinal-date) + /// (year and day of the year). + /// + /// Returns `None` on the out-of-range date and/or invalid day of year. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// + /// let from_yo_opt = NaiveDate::from_yo_opt; + /// + /// assert!(from_yo_opt(2015, 100).is_some()); + /// assert!(from_yo_opt(2015, 0).is_none()); + /// assert!(from_yo_opt(2015, 365).is_some()); + /// assert!(from_yo_opt(2015, 366).is_none()); + /// assert!(from_yo_opt(-4, 366).is_some()); // 5 BCE is a leap year + /// assert!(from_yo_opt(400000, 1).is_none()); + /// assert!(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)) + } + + /// Makes a new `NaiveDate` from the [ISO week date](#week-date) + /// (year, week number and day of the week). + /// The resulting `NaiveDate` may have a different year from the input year. + /// + /// Panics on the out-of-range date and/or invalid week number. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike, Weekday}; + /// + /// let d = NaiveDate::from_isoywd(2015, 11, Weekday::Sat); + /// assert_eq!(d.iso_week().year(), 2015); + /// assert_eq!(d.iso_week().week(), 11); + /// assert_eq!(d.weekday(), Weekday::Sat); + /// assert_eq!(d.year(), 2015); + /// assert_eq!(d.month(), 3); + /// assert_eq!(d.day(), 14); + /// assert_eq!(d.ordinal(), 73); // day of year + /// assert_eq!(d.num_days_from_ce(), 735671); // days since January 1, 1 CE + /// ~~~~ + pub fn from_isoywd(year: i32, week: u32, weekday: Weekday) -> NaiveDate { + NaiveDate::from_isoywd_opt(year, week, weekday).expect("invalid or out-of-range date") + } + + /// Makes a new `NaiveDate` from the [ISO week date](#week-date) + /// (year, week number and day of the week). + /// The resulting `NaiveDate` may have a different year from the input year. + /// + /// Returns `None` on the out-of-range date and/or invalid week number. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Weekday}; + /// + /// let from_ymd = NaiveDate::from_ymd; + /// let from_isoywd_opt = NaiveDate::from_isoywd_opt; + /// + /// assert_eq!(from_isoywd_opt(2015, 0, Weekday::Sun), None); + /// assert_eq!(from_isoywd_opt(2015, 10, Weekday::Sun), Some(from_ymd(2015, 3, 8))); + /// assert_eq!(from_isoywd_opt(2015, 30, Weekday::Mon), Some(from_ymd(2015, 7, 20))); + /// assert_eq!(from_isoywd_opt(2015, 60, Weekday::Mon), None); + /// + /// assert_eq!(from_isoywd_opt(400000, 10, Weekday::Fri), None); + /// assert_eq!(from_isoywd_opt(-400000, 10, Weekday::Sat), None); + /// ~~~~ + /// + /// The year number of ISO week date may differ from that of the calendar date. + /// + /// ~~~~ + /// # use chrono::{NaiveDate, Weekday}; + /// # let from_ymd = NaiveDate::from_ymd; + /// # let from_isoywd_opt = NaiveDate::from_isoywd_opt; + /// // Mo Tu We Th Fr Sa Su + /// // 2014-W52 22 23 24 25 26 27 28 has 4+ days of new year, + /// // 2015-W01 29 30 31 1 2 3 4 <- so this is the first week + /// assert_eq!(from_isoywd_opt(2014, 52, Weekday::Sun), Some(from_ymd(2014, 12, 28))); + /// assert_eq!(from_isoywd_opt(2014, 53, Weekday::Mon), None); + /// assert_eq!(from_isoywd_opt(2015, 1, Weekday::Mon), Some(from_ymd(2014, 12, 29))); + /// + /// // 2015-W52 21 22 23 24 25 26 27 has 4+ days of old year, + /// // 2015-W53 28 29 30 31 1 2 3 <- so this is the last week + /// // 2016-W01 4 5 6 7 8 9 10 + /// assert_eq!(from_isoywd_opt(2015, 52, Weekday::Sun), Some(from_ymd(2015, 12, 27))); + /// assert_eq!(from_isoywd_opt(2015, 53, Weekday::Sun), Some(from_ymd(2016, 1, 3))); + /// assert_eq!(from_isoywd_opt(2015, 54, Weekday::Mon), None); + /// assert_eq!(from_isoywd_opt(2016, 1, Weekday::Mon), Some(from_ymd(2016, 1, 4))); + /// ~~~~ + pub fn from_isoywd_opt(year: i32, week: u32, weekday: Weekday) -> Option<NaiveDate> { + let flags = YearFlags::from_year(year); + let nweeks = flags.nisoweeks(); + if 1 <= week && week <= nweeks { + // ordinal = week ordinal - delta + let weekord = week * 7 + weekday as u32; + let delta = flags.isoweek_delta(); + if weekord <= delta { + // ordinal < 1, previous year + let prevflags = YearFlags::from_year(year - 1); + NaiveDate::from_of( + year - 1, + Of::new(weekord + prevflags.ndays() - delta, prevflags), + ) + } else { + let ordinal = weekord - delta; + let ndays = flags.ndays(); + if ordinal <= ndays { + // this year + NaiveDate::from_of(year, Of::new(ordinal, flags)) + } else { + // ordinal > ndays, next year + let nextflags = YearFlags::from_year(year + 1); + NaiveDate::from_of(year + 1, Of::new(ordinal - ndays, nextflags)) + } + } + } else { + None + } + } + + /// Makes a new `NaiveDate` from a day's number in the proleptic Gregorian calendar, with + /// January 1, 1 being day 1. + /// + /// Panics if the date is out of range. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike, Weekday}; + /// + /// let d = NaiveDate::from_num_days_from_ce(735671); + /// assert_eq!(d.num_days_from_ce(), 735671); // days since January 1, 1 CE + /// assert_eq!(d.year(), 2015); + /// assert_eq!(d.month(), 3); + /// assert_eq!(d.day(), 14); + /// assert_eq!(d.ordinal(), 73); // day of year + /// assert_eq!(d.iso_week().year(), 2015); + /// assert_eq!(d.iso_week().week(), 11); + /// assert_eq!(d.weekday(), Weekday::Sat); + /// ~~~~ + /// + /// While not directly supported by Chrono, + /// it is easy to convert from the Julian day number + /// (January 1, 4713 BCE in the *Julian* calendar being Day 0) + /// to Gregorian with this method. + /// (Note that this panics when `jd` is out of range.) + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// + /// fn jd_to_date(jd: i32) -> NaiveDate { + /// // keep in mind that the Julian day number is 0-based + /// // while this method requires an 1-based number. + /// NaiveDate::from_num_days_from_ce(jd - 1721425) + /// } + /// + /// // January 1, 4713 BCE in Julian = November 24, 4714 BCE in Gregorian + /// assert_eq!(jd_to_date(0), NaiveDate::from_ymd(-4713, 11, 24)); + /// + /// assert_eq!(jd_to_date(1721426), NaiveDate::from_ymd(1, 1, 1)); + /// assert_eq!(jd_to_date(2450000), NaiveDate::from_ymd(1995, 10, 9)); + /// assert_eq!(jd_to_date(2451545), NaiveDate::from_ymd(2000, 1, 1)); + /// ~~~~ + #[inline] + pub fn from_num_days_from_ce(days: i32) -> NaiveDate { + NaiveDate::from_num_days_from_ce_opt(days).expect("out-of-range date") + } + + /// Makes a new `NaiveDate` from a day's number in the proleptic Gregorian calendar, with + /// January 1, 1 being day 1. + /// + /// Returns `None` if the date is out of range. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// + /// let from_ndays_opt = NaiveDate::from_num_days_from_ce_opt; + /// let from_ymd = NaiveDate::from_ymd; + /// + /// assert_eq!(from_ndays_opt(730_000), Some(from_ymd(1999, 9, 3))); + /// assert_eq!(from_ndays_opt(1), Some(from_ymd(1, 1, 1))); + /// assert_eq!(from_ndays_opt(0), Some(from_ymd(0, 12, 31))); + /// assert_eq!(from_ndays_opt(-1), Some(from_ymd(0, 12, 30))); + /// assert_eq!(from_ndays_opt(100_000_000), None); + /// assert_eq!(from_ndays_opt(-100_000_000), None); + /// ~~~~ + pub fn from_num_days_from_ce_opt(days: i32) -> Option<NaiveDate> { + let days = days + 365; // make December 31, 1 BCE equal to day 0 + let (year_div_400, cycle) = div_mod_floor(days, 146_097); + let (year_mod_400, ordinal) = internals::cycle_to_yo(cycle as u32); + let flags = YearFlags::from_year_mod_400(year_mod_400 as i32); + NaiveDate::from_of(year_div_400 * 400 + year_mod_400 as i32, Of::new(ordinal, flags)) + } + + /// Makes a new `NaiveDate` by counting the number of occurrences of a particular day-of-week + /// since the beginning of the given month. For instance, if you want the 2nd Friday of March + /// 2017, you would use `NaiveDate::from_weekday_of_month(2017, 3, Weekday::Fri, 2)`. + /// + /// # Panics + /// + /// The resulting `NaiveDate` is guaranteed to be in `month`. If `n` is larger than the number + /// of `weekday` in `month` (eg. the 6th Friday of March 2017) then this function will panic. + /// + /// `n` is 1-indexed. Passing `n=0` will cause a panic. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Weekday}; + /// + /// let from_weekday_of_month = NaiveDate::from_weekday_of_month; + /// let from_ymd = NaiveDate::from_ymd; + /// + /// assert_eq!(from_weekday_of_month(2018, 8, Weekday::Wed, 1), from_ymd(2018, 8, 1)); + /// assert_eq!(from_weekday_of_month(2018, 8, Weekday::Fri, 1), from_ymd(2018, 8, 3)); + /// assert_eq!(from_weekday_of_month(2018, 8, Weekday::Tue, 2), from_ymd(2018, 8, 14)); + /// assert_eq!(from_weekday_of_month(2018, 8, Weekday::Fri, 4), from_ymd(2018, 8, 24)); + /// assert_eq!(from_weekday_of_month(2018, 8, Weekday::Fri, 5), from_ymd(2018, 8, 31)); + /// ~~~~ + pub fn from_weekday_of_month(year: i32, month: u32, weekday: Weekday, n: u8) -> NaiveDate { + NaiveDate::from_weekday_of_month_opt(year, month, weekday, n).expect("out-of-range date") + } + + /// Makes a new `NaiveDate` by counting the number of occurrences of a particular day-of-week + /// since the beginning of the given month. For instance, if you want the 2nd Friday of March + /// 2017, you would use `NaiveDate::from_weekday_of_month(2017, 3, Weekday::Fri, 2)`. `n` is 1-indexed. + /// + /// ~~~~ + /// use chrono::{NaiveDate, Weekday}; + /// assert_eq!(NaiveDate::from_weekday_of_month_opt(2017, 3, Weekday::Fri, 2), + /// NaiveDate::from_ymd_opt(2017, 3, 10)) + /// ~~~~ + /// + /// Returns `None` if `n` out-of-range; ie. if `n` is larger than the number of `weekday` in + /// `month` (eg. the 6th Friday of March 2017), or if `n == 0`. + pub fn from_weekday_of_month_opt( + year: i32, + month: u32, + weekday: Weekday, + n: u8, + ) -> Option<NaiveDate> { + if n == 0 { + return None; + } + let first = NaiveDate::from_ymd(year, month, 1).weekday(); + let first_to_dow = (7 + weekday.number_from_monday() - first.number_from_monday()) % 7; + let day = (u32::from(n) - 1) * 7 + first_to_dow + 1; + NaiveDate::from_ymd_opt(year, month, day) + } + + /// Parses a string with the specified format string and returns a new `NaiveDate`. + /// See the [`format::strftime` module](../format/strftime/index.html) + /// on the supported escape sequences. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// + /// let parse_from_str = NaiveDate::parse_from_str; + /// + /// assert_eq!(parse_from_str("2015-09-05", "%Y-%m-%d"), + /// Ok(NaiveDate::from_ymd(2015, 9, 5))); + /// assert_eq!(parse_from_str("5sep2015", "%d%b%Y"), + /// Ok(NaiveDate::from_ymd(2015, 9, 5))); + /// ~~~~ + /// + /// Time and offset is ignored for the purpose of parsing. + /// + /// ~~~~ + /// # use chrono::NaiveDate; + /// # let parse_from_str = NaiveDate::parse_from_str; + /// assert_eq!(parse_from_str("2014-5-17T12:34:56+09:30", "%Y-%m-%dT%H:%M:%S%z"), + /// Ok(NaiveDate::from_ymd(2014, 5, 17))); + /// ~~~~ + /// + /// Out-of-bound dates or insufficient fields are errors. + /// + /// ~~~~ + /// # use chrono::NaiveDate; + /// # let parse_from_str = NaiveDate::parse_from_str; + /// assert!(parse_from_str("2015/9", "%Y/%m").is_err()); + /// assert!(parse_from_str("2015/9/31", "%Y/%m/%d").is_err()); + /// ~~~~ + /// + /// All parsed fields should be consistent to each other, otherwise it's an error. + /// + /// ~~~~ + /// # use chrono::NaiveDate; + /// # let parse_from_str = NaiveDate::parse_from_str; + /// assert!(parse_from_str("Sat, 09 Aug 2013", "%a, %d %b %Y").is_err()); + /// ~~~~ + pub fn parse_from_str(s: &str, fmt: &str) -> ParseResult<NaiveDate> { + let mut parsed = Parsed::new(); + parse(&mut parsed, s, StrftimeItems::new(fmt))?; + parsed.to_naive_date() + } + + /// Makes a new `NaiveDateTime` from the current date and given `NaiveTime`. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, NaiveTime, NaiveDateTime}; + /// + /// let d = NaiveDate::from_ymd(2015, 6, 3); + /// let t = NaiveTime::from_hms_milli(12, 34, 56, 789); + /// + /// let dt: NaiveDateTime = d.and_time(t); + /// assert_eq!(dt.date(), d); + /// assert_eq!(dt.time(), t); + /// ~~~~ + #[inline] + pub fn and_time(&self, time: NaiveTime) -> NaiveDateTime { + NaiveDateTime::new(*self, time) + } + + /// Makes a new `NaiveDateTime` from the current date, hour, minute and second. + /// + /// No [leap second](./struct.NaiveTime.html#leap-second-handling) is allowed here; + /// use `NaiveDate::and_hms_*` methods with a subsecond parameter instead. + /// + /// Panics on invalid hour, minute and/or second. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, NaiveDateTime, Datelike, Timelike, Weekday}; + /// + /// let d = NaiveDate::from_ymd(2015, 6, 3); + /// + /// let dt: NaiveDateTime = d.and_hms(12, 34, 56); + /// assert_eq!(dt.year(), 2015); + /// assert_eq!(dt.weekday(), Weekday::Wed); + /// assert_eq!(dt.second(), 56); + /// ~~~~ + #[inline] + pub fn and_hms(&self, hour: u32, min: u32, sec: u32) -> NaiveDateTime { + self.and_hms_opt(hour, min, sec).expect("invalid time") + } + + /// Makes a new `NaiveDateTime` from the current date, hour, minute and second. + /// + /// No [leap second](./struct.NaiveTime.html#leap-second-handling) is allowed here; + /// use `NaiveDate::and_hms_*_opt` methods with a subsecond parameter instead. + /// + /// Returns `None` on invalid hour, minute and/or second. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// + /// let d = NaiveDate::from_ymd(2015, 6, 3); + /// assert!(d.and_hms_opt(12, 34, 56).is_some()); + /// assert!(d.and_hms_opt(12, 34, 60).is_none()); // use `and_hms_milli_opt` instead + /// assert!(d.and_hms_opt(12, 60, 56).is_none()); + /// assert!(d.and_hms_opt(24, 34, 56).is_none()); + /// ~~~~ + #[inline] + pub fn and_hms_opt(&self, hour: u32, min: u32, sec: u32) -> Option<NaiveDateTime> { + NaiveTime::from_hms_opt(hour, min, sec).map(|time| self.and_time(time)) + } + + /// Makes a new `NaiveDateTime` from the current date, hour, minute, second and millisecond. + /// + /// The millisecond part can exceed 1,000 + /// in order to represent the [leap second](./struct.NaiveTime.html#leap-second-handling). + /// + /// Panics on invalid hour, minute, second and/or millisecond. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, NaiveDateTime, Datelike, Timelike, Weekday}; + /// + /// let d = NaiveDate::from_ymd(2015, 6, 3); + /// + /// let dt: NaiveDateTime = d.and_hms_milli(12, 34, 56, 789); + /// assert_eq!(dt.year(), 2015); + /// assert_eq!(dt.weekday(), Weekday::Wed); + /// assert_eq!(dt.second(), 56); + /// assert_eq!(dt.nanosecond(), 789_000_000); + /// ~~~~ + #[inline] + pub fn and_hms_milli(&self, hour: u32, min: u32, sec: u32, milli: u32) -> NaiveDateTime { + self.and_hms_milli_opt(hour, min, sec, milli).expect("invalid time") + } + + /// Makes a new `NaiveDateTime` from the current date, hour, minute, second and millisecond. + /// + /// The millisecond part can exceed 1,000 + /// in order to represent the [leap second](./struct.NaiveTime.html#leap-second-handling). + /// + /// Returns `None` on invalid hour, minute, second and/or millisecond. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// + /// let d = NaiveDate::from_ymd(2015, 6, 3); + /// assert!(d.and_hms_milli_opt(12, 34, 56, 789).is_some()); + /// assert!(d.and_hms_milli_opt(12, 34, 59, 1_789).is_some()); // leap second + /// assert!(d.and_hms_milli_opt(12, 34, 59, 2_789).is_none()); + /// assert!(d.and_hms_milli_opt(12, 34, 60, 789).is_none()); + /// assert!(d.and_hms_milli_opt(12, 60, 56, 789).is_none()); + /// assert!(d.and_hms_milli_opt(24, 34, 56, 789).is_none()); + /// ~~~~ + #[inline] + pub fn and_hms_milli_opt( + &self, + hour: u32, + min: u32, + sec: u32, + milli: u32, + ) -> Option<NaiveDateTime> { + NaiveTime::from_hms_milli_opt(hour, min, sec, milli).map(|time| self.and_time(time)) + } + + /// Makes a new `NaiveDateTime` from the current date, hour, minute, second and microsecond. + /// + /// The microsecond part can exceed 1,000,000 + /// in order to represent the [leap second](./struct.NaiveTime.html#leap-second-handling). + /// + /// Panics on invalid hour, minute, second and/or microsecond. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, NaiveDateTime, Datelike, Timelike, Weekday}; + /// + /// let d = NaiveDate::from_ymd(2015, 6, 3); + /// + /// let dt: NaiveDateTime = d.and_hms_micro(12, 34, 56, 789_012); + /// assert_eq!(dt.year(), 2015); + /// assert_eq!(dt.weekday(), Weekday::Wed); + /// assert_eq!(dt.second(), 56); + /// assert_eq!(dt.nanosecond(), 789_012_000); + /// ~~~~ + #[inline] + pub fn and_hms_micro(&self, hour: u32, min: u32, sec: u32, micro: u32) -> NaiveDateTime { + self.and_hms_micro_opt(hour, min, sec, micro).expect("invalid time") + } + + /// Makes a new `NaiveDateTime` from the current date, hour, minute, second and microsecond. + /// + /// The microsecond part can exceed 1,000,000 + /// in order to represent the [leap second](./struct.NaiveTime.html#leap-second-handling). + /// + /// Returns `None` on invalid hour, minute, second and/or microsecond. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// + /// let d = NaiveDate::from_ymd(2015, 6, 3); + /// assert!(d.and_hms_micro_opt(12, 34, 56, 789_012).is_some()); + /// assert!(d.and_hms_micro_opt(12, 34, 59, 1_789_012).is_some()); // leap second + /// assert!(d.and_hms_micro_opt(12, 34, 59, 2_789_012).is_none()); + /// assert!(d.and_hms_micro_opt(12, 34, 60, 789_012).is_none()); + /// assert!(d.and_hms_micro_opt(12, 60, 56, 789_012).is_none()); + /// assert!(d.and_hms_micro_opt(24, 34, 56, 789_012).is_none()); + /// ~~~~ + #[inline] + pub fn and_hms_micro_opt( + &self, + hour: u32, + min: u32, + sec: u32, + micro: u32, + ) -> Option<NaiveDateTime> { + NaiveTime::from_hms_micro_opt(hour, min, sec, micro).map(|time| self.and_time(time)) + } + + /// Makes a new `NaiveDateTime` from the current date, hour, minute, second and nanosecond. + /// + /// The nanosecond part can exceed 1,000,000,000 + /// in order to represent the [leap second](./struct.NaiveTime.html#leap-second-handling). + /// + /// Panics on invalid hour, minute, second and/or nanosecond. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, NaiveDateTime, Datelike, Timelike, Weekday}; + /// + /// let d = NaiveDate::from_ymd(2015, 6, 3); + /// + /// let dt: NaiveDateTime = d.and_hms_nano(12, 34, 56, 789_012_345); + /// assert_eq!(dt.year(), 2015); + /// assert_eq!(dt.weekday(), Weekday::Wed); + /// assert_eq!(dt.second(), 56); + /// assert_eq!(dt.nanosecond(), 789_012_345); + /// ~~~~ + #[inline] + pub fn and_hms_nano(&self, hour: u32, min: u32, sec: u32, nano: u32) -> NaiveDateTime { + self.and_hms_nano_opt(hour, min, sec, nano).expect("invalid time") + } + + /// Makes a new `NaiveDateTime` from the current date, hour, minute, second and nanosecond. + /// + /// The nanosecond part can exceed 1,000,000,000 + /// in order to represent the [leap second](./struct.NaiveTime.html#leap-second-handling). + /// + /// Returns `None` on invalid hour, minute, second and/or nanosecond. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// + /// let d = NaiveDate::from_ymd(2015, 6, 3); + /// assert!(d.and_hms_nano_opt(12, 34, 56, 789_012_345).is_some()); + /// assert!(d.and_hms_nano_opt(12, 34, 59, 1_789_012_345).is_some()); // leap second + /// assert!(d.and_hms_nano_opt(12, 34, 59, 2_789_012_345).is_none()); + /// assert!(d.and_hms_nano_opt(12, 34, 60, 789_012_345).is_none()); + /// assert!(d.and_hms_nano_opt(12, 60, 56, 789_012_345).is_none()); + /// assert!(d.and_hms_nano_opt(24, 34, 56, 789_012_345).is_none()); + /// ~~~~ + #[inline] + pub fn and_hms_nano_opt( + &self, + hour: u32, + min: u32, + sec: u32, + nano: u32, + ) -> Option<NaiveDateTime> { + NaiveTime::from_hms_nano_opt(hour, min, sec, nano).map(|time| self.and_time(time)) + } + + /// Returns the packed month-day-flags. + #[inline] + fn mdf(&self) -> Mdf { + self.of().to_mdf() + } + + /// Returns the packed ordinal-flags. + #[inline] + fn of(&self) -> Of { + Of((self.ymdf & 0b1_1111_1111_1111) as u32) + } + + /// Makes a new `NaiveDate` with the packed month-day-flags changed. + /// + /// Returns `None` when the resulting `NaiveDate` would be invalid. + #[inline] + fn with_mdf(&self, mdf: Mdf) -> Option<NaiveDate> { + self.with_of(mdf.to_of()) + } + + /// Makes a new `NaiveDate` with the packed ordinal-flags changed. + /// + /// Returns `None` when the resulting `NaiveDate` would be invalid. + #[inline] + fn with_of(&self, of: Of) -> Option<NaiveDate> { + if of.valid() { + let Of(of) = of; + Some(NaiveDate { ymdf: (self.ymdf & !0b1_1111_1111_1111) | of as DateImpl }) + } else { + None + } + } + + /// Makes a new `NaiveDate` for the next calendar date. + /// + /// Panics when `self` is the last representable date. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 6, 3).succ(), NaiveDate::from_ymd(2015, 6, 4)); + /// assert_eq!(NaiveDate::from_ymd(2015, 6, 30).succ(), NaiveDate::from_ymd(2015, 7, 1)); + /// assert_eq!(NaiveDate::from_ymd(2015, 12, 31).succ(), NaiveDate::from_ymd(2016, 1, 1)); + /// ~~~~ + #[inline] + pub fn succ(&self) -> NaiveDate { + self.succ_opt().expect("out of bound") + } + + /// Makes a new `NaiveDate` for the next calendar date. + /// + /// Returns `None` when `self` is the last representable date. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// use chrono::naive::MAX_DATE; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 6, 3).succ_opt(), + /// Some(NaiveDate::from_ymd(2015, 6, 4))); + /// assert_eq!(MAX_DATE.succ_opt(), None); + /// ~~~~ + #[inline] + pub fn succ_opt(&self) -> Option<NaiveDate> { + self.with_of(self.of().succ()).or_else(|| NaiveDate::from_ymd_opt(self.year() + 1, 1, 1)) + } + + /// Makes a new `NaiveDate` for the previous calendar date. + /// + /// Panics when `self` is the first representable date. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 6, 3).pred(), NaiveDate::from_ymd(2015, 6, 2)); + /// assert_eq!(NaiveDate::from_ymd(2015, 6, 1).pred(), NaiveDate::from_ymd(2015, 5, 31)); + /// assert_eq!(NaiveDate::from_ymd(2015, 1, 1).pred(), NaiveDate::from_ymd(2014, 12, 31)); + /// ~~~~ + #[inline] + pub fn pred(&self) -> NaiveDate { + self.pred_opt().expect("out of bound") + } + + /// Makes a new `NaiveDate` for the previous calendar date. + /// + /// Returns `None` when `self` is the first representable date. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// use chrono::naive::MIN_DATE; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 6, 3).pred_opt(), + /// Some(NaiveDate::from_ymd(2015, 6, 2))); + /// assert_eq!(MIN_DATE.pred_opt(), None); + /// ~~~~ + #[inline] + pub fn pred_opt(&self) -> Option<NaiveDate> { + self.with_of(self.of().pred()).or_else(|| NaiveDate::from_ymd_opt(self.year() - 1, 12, 31)) + } + + /// Adds the `days` part of given `Duration` to the current date. + /// + /// Returns `None` when it will result in overflow. + /// + /// # Example + /// + /// ~~~~ + /// # extern crate chrono; fn main() { + /// use chrono::{Duration, NaiveDate}; + /// use chrono::naive::MAX_DATE; + /// + /// let d = NaiveDate::from_ymd(2015, 9, 5); + /// assert_eq!(d.checked_add_signed(Duration::days(40)), + /// Some(NaiveDate::from_ymd(2015, 10, 15))); + /// assert_eq!(d.checked_add_signed(Duration::days(-40)), + /// Some(NaiveDate::from_ymd(2015, 7, 27))); + /// assert_eq!(d.checked_add_signed(Duration::days(1_000_000_000)), None); + /// assert_eq!(d.checked_add_signed(Duration::days(-1_000_000_000)), None); + /// assert_eq!(MAX_DATE.checked_add_signed(Duration::days(1)), None); + /// # } + /// ~~~~ + pub fn checked_add_signed(self, rhs: OldDuration) -> Option<NaiveDate> { + let year = self.year(); + let (mut year_div_400, year_mod_400) = div_mod_floor(year, 400); + let cycle = internals::yo_to_cycle(year_mod_400 as u32, self.of().ordinal()); + let cycle = try_opt!((cycle as i32).checked_add(try_opt!(rhs.num_days().to_i32()))); + let (cycle_div_400y, cycle) = div_mod_floor(cycle, 146_097); + year_div_400 += cycle_div_400y; + + let (year_mod_400, ordinal) = internals::cycle_to_yo(cycle as u32); + let flags = YearFlags::from_year_mod_400(year_mod_400 as i32); + NaiveDate::from_of(year_div_400 * 400 + year_mod_400 as i32, Of::new(ordinal, flags)) + } + + /// Subtracts the `days` part of given `Duration` from the current date. + /// + /// Returns `None` when it will result in overflow. + /// + /// # Example + /// + /// ~~~~ + /// # extern crate chrono; fn main() { + /// use chrono::{Duration, NaiveDate}; + /// use chrono::naive::MIN_DATE; + /// + /// let d = NaiveDate::from_ymd(2015, 9, 5); + /// assert_eq!(d.checked_sub_signed(Duration::days(40)), + /// Some(NaiveDate::from_ymd(2015, 7, 27))); + /// assert_eq!(d.checked_sub_signed(Duration::days(-40)), + /// Some(NaiveDate::from_ymd(2015, 10, 15))); + /// assert_eq!(d.checked_sub_signed(Duration::days(1_000_000_000)), None); + /// assert_eq!(d.checked_sub_signed(Duration::days(-1_000_000_000)), None); + /// assert_eq!(MIN_DATE.checked_sub_signed(Duration::days(1)), None); + /// # } + /// ~~~~ + pub fn checked_sub_signed(self, rhs: OldDuration) -> Option<NaiveDate> { + let year = self.year(); + let (mut year_div_400, year_mod_400) = div_mod_floor(year, 400); + let cycle = internals::yo_to_cycle(year_mod_400 as u32, self.of().ordinal()); + let cycle = try_opt!((cycle as i32).checked_sub(try_opt!(rhs.num_days().to_i32()))); + let (cycle_div_400y, cycle) = div_mod_floor(cycle, 146_097); + year_div_400 += cycle_div_400y; + + let (year_mod_400, ordinal) = internals::cycle_to_yo(cycle as u32); + let flags = YearFlags::from_year_mod_400(year_mod_400 as i32); + NaiveDate::from_of(year_div_400 * 400 + year_mod_400 as i32, Of::new(ordinal, flags)) + } + + /// Subtracts another `NaiveDate` from the current date. + /// Returns a `Duration` of integral numbers. + /// + /// This does not overflow or underflow at all, + /// as all possible output fits in the range of `Duration`. + /// + /// # Example + /// + /// ~~~~ + /// # extern crate chrono; fn main() { + /// use chrono::{Duration, NaiveDate}; + /// + /// let from_ymd = NaiveDate::from_ymd; + /// let since = NaiveDate::signed_duration_since; + /// + /// assert_eq!(since(from_ymd(2014, 1, 1), from_ymd(2014, 1, 1)), Duration::zero()); + /// assert_eq!(since(from_ymd(2014, 1, 1), from_ymd(2013, 12, 31)), Duration::days(1)); + /// assert_eq!(since(from_ymd(2014, 1, 1), from_ymd(2014, 1, 2)), Duration::days(-1)); + /// assert_eq!(since(from_ymd(2014, 1, 1), from_ymd(2013, 9, 23)), Duration::days(100)); + /// assert_eq!(since(from_ymd(2014, 1, 1), from_ymd(2013, 1, 1)), Duration::days(365)); + /// assert_eq!(since(from_ymd(2014, 1, 1), from_ymd(2010, 1, 1)), Duration::days(365*4 + 1)); + /// assert_eq!(since(from_ymd(2014, 1, 1), from_ymd(1614, 1, 1)), Duration::days(365*400 + 97)); + /// # } + /// ~~~~ + pub fn signed_duration_since(self, rhs: NaiveDate) -> OldDuration { + let year1 = self.year(); + let year2 = rhs.year(); + let (year1_div_400, year1_mod_400) = div_mod_floor(year1, 400); + let (year2_div_400, year2_mod_400) = div_mod_floor(year2, 400); + let cycle1 = i64::from(internals::yo_to_cycle(year1_mod_400 as u32, self.of().ordinal())); + let cycle2 = i64::from(internals::yo_to_cycle(year2_mod_400 as u32, rhs.of().ordinal())); + OldDuration::days( + (i64::from(year1_div_400) - i64::from(year2_div_400)) * 146_097 + (cycle1 - cycle2), + ) + } + + /// Formats the date with the specified formatting items. + /// Otherwise it is the same as the ordinary `format` method. + /// + /// The `Iterator` of items should be `Clone`able, + /// since the resulting `DelayedFormat` value may be formatted multiple times. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// use chrono::format::strftime::StrftimeItems; + /// + /// let fmt = StrftimeItems::new("%Y-%m-%d"); + /// let d = NaiveDate::from_ymd(2015, 9, 5); + /// assert_eq!(d.format_with_items(fmt.clone()).to_string(), "2015-09-05"); + /// assert_eq!(d.format("%Y-%m-%d").to_string(), "2015-09-05"); + /// ~~~~ + /// + /// The resulting `DelayedFormat` can be formatted directly via the `Display` trait. + /// + /// ~~~~ + /// # use chrono::NaiveDate; + /// # use chrono::format::strftime::StrftimeItems; + /// # let fmt = StrftimeItems::new("%Y-%m-%d").clone(); + /// # let d = NaiveDate::from_ymd(2015, 9, 5); + /// assert_eq!(format!("{}", d.format_with_items(fmt)), "2015-09-05"); + /// ~~~~ + #[cfg(any(feature = "alloc", feature = "std", test))] + #[inline] + pub fn format_with_items<'a, I, B>(&self, items: I) -> DelayedFormat<I> + where + I: Iterator<Item = B> + Clone, + B: Borrow<Item<'a>>, + { + DelayedFormat::new(Some(*self), None, items) + } + + /// Formats the date with the specified format string. + /// See the [`format::strftime` module](../format/strftime/index.html) + /// on the supported escape sequences. + /// + /// This returns a `DelayedFormat`, + /// which gets converted to a string only when actual formatting happens. + /// You may use the `to_string` method to get a `String`, + /// or just feed it into `print!` and other formatting macros. + /// (In this way it avoids the redundant memory allocation.) + /// + /// A wrong format string does *not* issue an error immediately. + /// Rather, converting or formatting the `DelayedFormat` fails. + /// You are recommended to immediately use `DelayedFormat` for this reason. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::NaiveDate; + /// + /// let d = NaiveDate::from_ymd(2015, 9, 5); + /// assert_eq!(d.format("%Y-%m-%d").to_string(), "2015-09-05"); + /// assert_eq!(d.format("%A, %-d %B, %C%y").to_string(), "Saturday, 5 September, 2015"); + /// ~~~~ + /// + /// The resulting `DelayedFormat` can be formatted directly via the `Display` trait. + /// + /// ~~~~ + /// # use chrono::NaiveDate; + /// # let d = NaiveDate::from_ymd(2015, 9, 5); + /// assert_eq!(format!("{}", d.format("%Y-%m-%d")), "2015-09-05"); + /// assert_eq!(format!("{}", d.format("%A, %-d %B, %C%y")), "Saturday, 5 September, 2015"); + /// ~~~~ + #[cfg(any(feature = "alloc", feature = "std", test))] + #[inline] + pub fn format<'a>(&self, fmt: &'a str) -> DelayedFormat<StrftimeItems<'a>> { + self.format_with_items(StrftimeItems::new(fmt)) + } + + /// Returns an iterator that steps by days until the last representable date. + /// + /// # Example + /// + /// ``` + /// # use chrono::NaiveDate; + /// + /// let expected = [ + /// NaiveDate::from_ymd(2016, 2, 27), + /// NaiveDate::from_ymd(2016, 2, 28), + /// NaiveDate::from_ymd(2016, 2, 29), + /// NaiveDate::from_ymd(2016, 3, 1), + /// ]; + /// + /// let mut count = 0; + /// for (idx, d) in NaiveDate::from_ymd(2016, 2, 27).iter_days().take(4).enumerate() { + /// assert_eq!(d, expected[idx]); + /// count += 1; + /// } + /// assert_eq!(count, 4); + /// ``` + #[inline] + pub fn iter_days(&self) -> NaiveDateDaysIterator { + NaiveDateDaysIterator { value: *self } + } + + /// Returns an iterator that steps by weeks until the last representable date. + /// + /// # Example + /// + /// ``` + /// # use chrono::NaiveDate; + /// + /// let expected = [ + /// NaiveDate::from_ymd(2016, 2, 27), + /// NaiveDate::from_ymd(2016, 3, 5), + /// NaiveDate::from_ymd(2016, 3, 12), + /// NaiveDate::from_ymd(2016, 3, 19), + /// ]; + /// + /// let mut count = 0; + /// for (idx, d) in NaiveDate::from_ymd(2016, 2, 27).iter_weeks().take(4).enumerate() { + /// assert_eq!(d, expected[idx]); + /// count += 1; + /// } + /// assert_eq!(count, 4); + /// ``` + #[inline] + pub fn iter_weeks(&self) -> NaiveDateWeeksIterator { + NaiveDateWeeksIterator { value: *self } + } +} + +impl Datelike for NaiveDate { + /// Returns the year number in the [calendar date](#calendar-date). + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).year(), 2015); + /// assert_eq!(NaiveDate::from_ymd(-308, 3, 14).year(), -308); // 309 BCE + /// ~~~~ + #[inline] + fn year(&self) -> i32 { + self.ymdf >> 13 + } + + /// Returns the month number starting from 1. + /// + /// The return value ranges from 1 to 12. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).month(), 9); + /// assert_eq!(NaiveDate::from_ymd(-308, 3, 14).month(), 3); + /// ~~~~ + #[inline] + fn month(&self) -> u32 { + self.mdf().month() + } + + /// Returns the month number starting from 0. + /// + /// The return value ranges from 0 to 11. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).month0(), 8); + /// assert_eq!(NaiveDate::from_ymd(-308, 3, 14).month0(), 2); + /// ~~~~ + #[inline] + fn month0(&self) -> u32 { + self.mdf().month() - 1 + } + + /// Returns the day of month starting from 1. + /// + /// The return value ranges from 1 to 31. (The last day of month differs by months.) + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).day(), 8); + /// assert_eq!(NaiveDate::from_ymd(-308, 3, 14).day(), 14); + /// ~~~~ + /// + /// Combined with [`NaiveDate::pred`](#method.pred), + /// one can determine the number of days in a particular month. + /// (Note that this panics when `year` is out of range.) + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// fn ndays_in_month(year: i32, month: u32) -> u32 { + /// // the first day of the next month... + /// let (y, m) = if month == 12 { (year + 1, 1) } else { (year, month + 1) }; + /// let d = NaiveDate::from_ymd(y, m, 1); + /// + /// // ...is preceded by the last day of the original month + /// d.pred().day() + /// } + /// + /// assert_eq!(ndays_in_month(2015, 8), 31); + /// assert_eq!(ndays_in_month(2015, 9), 30); + /// assert_eq!(ndays_in_month(2015, 12), 31); + /// assert_eq!(ndays_in_month(2016, 2), 29); + /// assert_eq!(ndays_in_month(2017, 2), 28); + /// ~~~~ + #[inline] + fn day(&self) -> u32 { + self.mdf().day() + } + + /// Returns the day of month starting from 0. + /// + /// The return value ranges from 0 to 30. (The last day of month differs by months.) + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).day0(), 7); + /// assert_eq!(NaiveDate::from_ymd(-308, 3, 14).day0(), 13); + /// ~~~~ + #[inline] + fn day0(&self) -> u32 { + self.mdf().day() - 1 + } + + /// Returns the day of year starting from 1. + /// + /// The return value ranges from 1 to 366. (The last day of year differs by years.) + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).ordinal(), 251); + /// assert_eq!(NaiveDate::from_ymd(-308, 3, 14).ordinal(), 74); + /// ~~~~ + /// + /// Combined with [`NaiveDate::pred`](#method.pred), + /// one can determine the number of days in a particular year. + /// (Note that this panics when `year` is out of range.) + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// fn ndays_in_year(year: i32) -> u32 { + /// // the first day of the next year... + /// let d = NaiveDate::from_ymd(year + 1, 1, 1); + /// + /// // ...is preceded by the last day of the original year + /// d.pred().ordinal() + /// } + /// + /// assert_eq!(ndays_in_year(2015), 365); + /// assert_eq!(ndays_in_year(2016), 366); + /// assert_eq!(ndays_in_year(2017), 365); + /// assert_eq!(ndays_in_year(2000), 366); + /// assert_eq!(ndays_in_year(2100), 365); + /// ~~~~ + #[inline] + fn ordinal(&self) -> u32 { + self.of().ordinal() + } + + /// Returns the day of year starting from 0. + /// + /// The return value ranges from 0 to 365. (The last day of year differs by years.) + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).ordinal0(), 250); + /// assert_eq!(NaiveDate::from_ymd(-308, 3, 14).ordinal0(), 73); + /// ~~~~ + #[inline] + fn ordinal0(&self) -> u32 { + self.of().ordinal() - 1 + } + + /// Returns the day of week. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike, Weekday}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).weekday(), Weekday::Tue); + /// assert_eq!(NaiveDate::from_ymd(-308, 3, 14).weekday(), Weekday::Fri); + /// ~~~~ + #[inline] + fn weekday(&self) -> Weekday { + self.of().weekday() + } + + #[inline] + fn iso_week(&self) -> IsoWeek { + isoweek::iso_week_from_yof(self.year(), self.of()) + } + + /// Makes a new `NaiveDate` with the year number changed. + /// + /// Returns `None` when the resulting `NaiveDate` would be invalid. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).with_year(2016), + /// Some(NaiveDate::from_ymd(2016, 9, 8))); + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).with_year(-308), + /// Some(NaiveDate::from_ymd(-308, 9, 8))); + /// ~~~~ + /// + /// A leap day (February 29) is a good example that this method can return `None`. + /// + /// ~~~~ + /// # use chrono::{NaiveDate, Datelike}; + /// assert!(NaiveDate::from_ymd(2016, 2, 29).with_year(2015).is_none()); + /// assert!(NaiveDate::from_ymd(2016, 2, 29).with_year(2020).is_some()); + /// ~~~~ + #[inline] + fn with_year(&self, year: i32) -> Option<NaiveDate> { + // we need to operate with `mdf` since we should keep the month and day number as is + let mdf = self.mdf(); + + // adjust the flags as needed + let flags = YearFlags::from_year(year); + let mdf = mdf.with_flags(flags); + + NaiveDate::from_mdf(year, mdf) + } + + /// Makes a new `NaiveDate` with the month number (starting from 1) changed. + /// + /// Returns `None` when the resulting `NaiveDate` would be invalid. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).with_month(10), + /// Some(NaiveDate::from_ymd(2015, 10, 8))); + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).with_month(13), None); // no month 13 + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 30).with_month(2), None); // no February 30 + /// ~~~~ + #[inline] + fn with_month(&self, month: u32) -> Option<NaiveDate> { + self.with_mdf(self.mdf().with_month(month)) + } + + /// Makes a new `NaiveDate` with the month number (starting from 0) changed. + /// + /// Returns `None` when the resulting `NaiveDate` would be invalid. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).with_month0(9), + /// Some(NaiveDate::from_ymd(2015, 10, 8))); + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).with_month0(12), None); // no month 13 + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 30).with_month0(1), None); // no February 30 + /// ~~~~ + #[inline] + fn with_month0(&self, month0: u32) -> Option<NaiveDate> { + self.with_mdf(self.mdf().with_month(month0 + 1)) + } + + /// Makes a new `NaiveDate` with the day of month (starting from 1) changed. + /// + /// Returns `None` when the resulting `NaiveDate` would be invalid. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).with_day(30), + /// Some(NaiveDate::from_ymd(2015, 9, 30))); + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).with_day(31), + /// None); // no September 31 + /// ~~~~ + #[inline] + fn with_day(&self, day: u32) -> Option<NaiveDate> { + self.with_mdf(self.mdf().with_day(day)) + } + + /// Makes a new `NaiveDate` with the day of month (starting from 0) changed. + /// + /// Returns `None` when the resulting `NaiveDate` would be invalid. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).with_day0(29), + /// Some(NaiveDate::from_ymd(2015, 9, 30))); + /// assert_eq!(NaiveDate::from_ymd(2015, 9, 8).with_day0(30), + /// None); // no September 31 + /// ~~~~ + #[inline] + fn with_day0(&self, day0: u32) -> Option<NaiveDate> { + self.with_mdf(self.mdf().with_day(day0 + 1)) + } + + /// Makes a new `NaiveDate` with the day of year (starting from 1) changed. + /// + /// Returns `None` when the resulting `NaiveDate` would be invalid. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 1, 1).with_ordinal(60), + /// Some(NaiveDate::from_ymd(2015, 3, 1))); + /// assert_eq!(NaiveDate::from_ymd(2015, 1, 1).with_ordinal(366), + /// None); // 2015 had only 365 days + /// + /// assert_eq!(NaiveDate::from_ymd(2016, 1, 1).with_ordinal(60), + /// Some(NaiveDate::from_ymd(2016, 2, 29))); + /// assert_eq!(NaiveDate::from_ymd(2016, 1, 1).with_ordinal(366), + /// Some(NaiveDate::from_ymd(2016, 12, 31))); + /// ~~~~ + #[inline] + fn with_ordinal(&self, ordinal: u32) -> Option<NaiveDate> { + self.with_of(self.of().with_ordinal(ordinal)) + } + + /// Makes a new `NaiveDate` with the day of year (starting from 0) changed. + /// + /// Returns `None` when the resulting `NaiveDate` would be invalid. + /// + /// # Example + /// + /// ~~~~ + /// use chrono::{NaiveDate, Datelike}; + /// + /// assert_eq!(NaiveDate::from_ymd(2015, 1, 1).with_ordinal0(59), + /// Some(NaiveDate::from_ymd(2015, 3, 1))); + /// assert_eq!(NaiveDate::from_ymd(2015, 1, 1).with_ordinal0(365), + /// None); // 2015 had only 365 days + /// + /// assert_eq!(NaiveDate::from_ymd(2016, 1, 1).with_ordinal0(59), + /// Some(NaiveDate::from_ymd(2016, 2, 29))); + /// assert_eq!(NaiveDate::from_ymd(2016, 1, 1).with_ordinal0(365), + /// Some(NaiveDate::from_ymd(2016, 12, 31))); + /// ~~~~ + #[inline] + fn with_ordinal0(&self, ordinal0: u32) -> Option<NaiveDate> { + self.with_of(self.of().with_ordinal(ordinal0 + 1)) + } +} + +/// An addition of `Duration` to `NaiveDate` discards the fractional days, +/// rounding to the closest integral number of days towards `Duration::zero()`. +/// +/// Panics on underflow or overflow. +/// Use [`NaiveDate::checked_add_signed`](#method.checked_add_signed) to detect that. +/// +/// # Example +/// +/// ~~~~ +/// # extern crate chrono; fn main() { +/// use chrono::{Duration, NaiveDate}; +/// +/// let from_ymd = NaiveDate::from_ymd; +/// +/// assert_eq!(from_ymd(2014, 1, 1) + Duration::zero(), from_ymd(2014, 1, 1)); +/// assert_eq!(from_ymd(2014, 1, 1) + Duration::seconds(86399), from_ymd(2014, 1, 1)); +/// assert_eq!(from_ymd(2014, 1, 1) + Duration::seconds(-86399), from_ymd(2014, 1, 1)); +/// assert_eq!(from_ymd(2014, 1, 1) + Duration::days(1), from_ymd(2014, 1, 2)); +/// assert_eq!(from_ymd(2014, 1, 1) + Duration::days(-1), from_ymd(2013, 12, 31)); +/// assert_eq!(from_ymd(2014, 1, 1) + Duration::days(364), from_ymd(2014, 12, 31)); +/// assert_eq!(from_ymd(2014, 1, 1) + Duration::days(365*4 + 1), from_ymd(2018, 1, 1)); +/// assert_eq!(from_ymd(2014, 1, 1) + Duration::days(365*400 + 97), from_ymd(2414, 1, 1)); +/// # } +/// ~~~~ +impl Add<OldDuration> for NaiveDate { + type Output = NaiveDate; + + #[inline] + fn add(self, rhs: OldDuration) -> NaiveDate { + self.checked_add_signed(rhs).expect("`NaiveDate + Duration` overflowed") + } +} + +impl AddAssign<OldDuration> for NaiveDate { + #[inline] + fn add_assign(&mut self, rhs: OldDuration) { + *self = self.add(rhs); + } +} + +/// A subtraction of `Duration` from `NaiveDate` discards the fractional days, +/// rounding to the closest integral number of days towards `Duration::zero()`. +/// It is the same as the addition with a negated `Duration`. +/// +/// Panics on underflow or overflow. +/// Use [`NaiveDate::checked_sub_signed`](#method.checked_sub_signed) to detect that. +/// +/// # Example +/// +/// ~~~~ +/// # extern crate chrono; fn main() { +/// use chrono::{Duration, NaiveDate}; +/// +/// let from_ymd = NaiveDate::from_ymd; +/// +/// assert_eq!(from_ymd(2014, 1, 1) - Duration::zero(), from_ymd(2014, 1, 1)); +/// assert_eq!(from_ymd(2014, 1, 1) - Duration::seconds(86399), from_ymd(2014, 1, 1)); +/// assert_eq!(from_ymd(2014, 1, 1) - Duration::seconds(-86399), from_ymd(2014, 1, 1)); +/// assert_eq!(from_ymd(2014, 1, 1) - Duration::days(1), from_ymd(2013, 12, 31)); +/// assert_eq!(from_ymd(2014, 1, 1) - Duration::days(-1), from_ymd(2014, 1, 2)); +/// assert_eq!(from_ymd(2014, 1, 1) - Duration::days(364), from_ymd(2013, 1, 2)); +/// assert_eq!(from_ymd(2014, 1, 1) - Duration::days(365*4 + 1), from_ymd(2010, 1, 1)); +/// assert_eq!(from_ymd(2014, 1, 1) - Duration::days(365*400 + 97), from_ymd(1614, 1, 1)); +/// # } +/// ~~~~ +impl Sub<OldDuration> for NaiveDate { + type Output = NaiveDate; + + #[inline] + fn sub(self, rhs: OldDuration) -> NaiveDate { + self.checked_sub_signed(rhs).expect("`NaiveDate - Duration` overflowed") + } +} + +impl SubAssign<OldDuration> for NaiveDate { + #[inline] + fn sub_assign(&mut self, rhs: OldDuration) { + *self = self.sub(rhs); + } +} + +/// Subtracts another `NaiveDate` from the current date. +/// Returns a `Duration` of integral numbers. +/// +/// This does not overflow or underflow at all, +/// as all possible output fits in the range of `Duration`. +/// +/// The implementation is a wrapper around +/// [`NaiveDate::signed_duration_since`](#method.signed_duration_since). +/// +/// # Example +/// +/// ~~~~ +/// # extern crate chrono; fn main() { +/// use chrono::{Duration, NaiveDate}; +/// +/// let from_ymd = NaiveDate::from_ymd; +/// +/// assert_eq!(from_ymd(2014, 1, 1) - from_ymd(2014, 1, 1), Duration::zero()); +/// assert_eq!(from_ymd(2014, 1, 1) - from_ymd(2013, 12, 31), Duration::days(1)); +/// assert_eq!(from_ymd(2014, 1, 1) - from_ymd(2014, 1, 2), Duration::days(-1)); +/// assert_eq!(from_ymd(2014, 1, 1) - from_ymd(2013, 9, 23), Duration::days(100)); +/// assert_eq!(from_ymd(2014, 1, 1) - from_ymd(2013, 1, 1), Duration::days(365)); +/// assert_eq!(from_ymd(2014, 1, 1) - from_ymd(2010, 1, 1), Duration::days(365*4 + 1)); +/// assert_eq!(from_ymd(2014, 1, 1) - from_ymd(1614, 1, 1), Duration::days(365*400 + 97)); +/// # } +/// ~~~~ +impl Sub<NaiveDate> for NaiveDate { + type Output = OldDuration; + + #[inline] + fn sub(self, rhs: NaiveDate) -> OldDuration { + self.signed_duration_since(rhs) + } +} + +/// Iterator over `NaiveDate` with a step size of one day. +#[derive(Debug, Copy, Clone, Hash, PartialEq, PartialOrd, Eq, Ord)] +pub struct NaiveDateDaysIterator { + value: NaiveDate, +} + +impl Iterator for NaiveDateDaysIterator { + type Item = NaiveDate; + + fn next(&mut self) -> Option<Self::Item> { + if self.value == MAX_DATE { + return None; + } + // current < MAX_DATE from here on: + let current = self.value; + // This can't panic because current is < MAX_DATE: + self.value = current.succ(); + Some(current) + } + + fn size_hint(&self) -> (usize, Option<usize>) { + let exact_size = MAX_DATE.signed_duration_since(self.value).num_days(); + (exact_size as usize, Some(exact_size as usize)) + } +} + +impl ExactSizeIterator for NaiveDateDaysIterator {} + +#[derive(Debug, Copy, Clone, Hash, PartialEq, PartialOrd, Eq, Ord)] +pub struct NaiveDateWeeksIterator { + value: NaiveDate, +} + +impl Iterator for NaiveDateWeeksIterator { + type Item = NaiveDate; + + fn next(&mut self) -> Option<Self::Item> { + if MAX_DATE - self.value < OldDuration::weeks(1) { + return None; + } + let current = self.value; + self.value = current + OldDuration::weeks(1); + Some(current) + } + + fn size_hint(&self) -> (usize, Option<usize>) { + let exact_size = MAX_DATE.signed_duration_since(self.value).num_weeks(); + (exact_size as usize, Some(exact_size as usize)) + } +} + +impl ExactSizeIterator for NaiveDateWeeksIterator {} + +// TODO: NaiveDateDaysIterator and NaiveDateWeeksIterator should implement FusedIterator, +// TrustedLen, and Step once they becomes stable. +// See: https://github.com/chronotope/chrono/issues/208 + +/// The `Debug` output of the naive date `d` is the same as +/// [`d.format("%Y-%m-%d")`](../format/strftime/index.html). +/// +/// The string printed can be readily parsed via the `parse` method on `str`. +/// +/// # Example +/// +/// ~~~~ +/// use chrono::NaiveDate; +/// +/// assert_eq!(format!("{:?}", NaiveDate::from_ymd(2015, 9, 5)), "2015-09-05"); +/// assert_eq!(format!("{:?}", NaiveDate::from_ymd( 0, 1, 1)), "0000-01-01"); +/// assert_eq!(format!("{:?}", NaiveDate::from_ymd(9999, 12, 31)), "9999-12-31"); +/// ~~~~ +/// +/// ISO 8601 requires an explicit sign for years before 1 BCE or after 9999 CE. +/// +/// ~~~~ +/// # use chrono::NaiveDate; +/// assert_eq!(format!("{:?}", NaiveDate::from_ymd( -1, 1, 1)), "-0001-01-01"); +/// assert_eq!(format!("{:?}", NaiveDate::from_ymd(10000, 12, 31)), "+10000-12-31"); +/// ~~~~ +impl fmt::Debug for NaiveDate { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + let year = self.year(); + let mdf = self.mdf(); + if 0 <= year && year <= 9999 { + write!(f, "{:04}-{:02}-{:02}", year, mdf.month(), mdf.day()) + } else { + // ISO 8601 requires the explicit sign for out-of-range years + write!(f, "{:+05}-{:02}-{:02}", year, mdf.month(), mdf.day()) + } + } +} + +/// The `Display` output of the naive date `d` is the same as +/// [`d.format("%Y-%m-%d")`](../format/strftime/index.html). +/// +/// The string printed can be readily parsed via the `parse` method on `str`. +/// +/// # Example +/// +/// ~~~~ +/// use chrono::NaiveDate; +/// +/// assert_eq!(format!("{}", NaiveDate::from_ymd(2015, 9, 5)), "2015-09-05"); +/// assert_eq!(format!("{}", NaiveDate::from_ymd( 0, 1, 1)), "0000-01-01"); +/// assert_eq!(format!("{}", NaiveDate::from_ymd(9999, 12, 31)), "9999-12-31"); +/// ~~~~ +/// +/// ISO 8601 requires an explicit sign for years before 1 BCE or after 9999 CE. +/// +/// ~~~~ +/// # use chrono::NaiveDate; +/// assert_eq!(format!("{}", NaiveDate::from_ymd( -1, 1, 1)), "-0001-01-01"); +/// assert_eq!(format!("{}", NaiveDate::from_ymd(10000, 12, 31)), "+10000-12-31"); +/// ~~~~ +impl fmt::Display for NaiveDate { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + fmt::Debug::fmt(self, f) + } +} + +/// Parsing a `str` into a `NaiveDate` uses the same format, +/// [`%Y-%m-%d`](../format/strftime/index.html), as in `Debug` and `Display`. +/// +/// # Example +/// +/// ~~~~ +/// use chrono::NaiveDate; +/// +/// let d = NaiveDate::from_ymd(2015, 9, 18); +/// assert_eq!("2015-09-18".parse::<NaiveDate>(), Ok(d)); +/// +/// let d = NaiveDate::from_ymd(12345, 6, 7); +/// assert_eq!("+12345-6-7".parse::<NaiveDate>(), Ok(d)); +/// +/// assert!("foo".parse::<NaiveDate>().is_err()); +/// ~~~~ +impl str::FromStr for NaiveDate { + type Err = ParseError; + + fn from_str(s: &str) -> ParseResult<NaiveDate> { + const ITEMS: &'static [Item<'static>] = &[ + Item::Numeric(Numeric::Year, Pad::Zero), + Item::Space(""), + Item::Literal("-"), + Item::Numeric(Numeric::Month, Pad::Zero), + Item::Space(""), + Item::Literal("-"), + Item::Numeric(Numeric::Day, Pad::Zero), + Item::Space(""), + ]; + + let mut parsed = Parsed::new(); + parse(&mut parsed, s, ITEMS.iter())?; + parsed.to_naive_date() + } +} + +#[cfg(all(test, any(feature = "rustc-serialize", feature = "serde")))] +fn test_encodable_json<F, E>(to_string: F) +where + F: Fn(&NaiveDate) -> Result<String, E>, + E: ::std::fmt::Debug, +{ + assert_eq!(to_string(&NaiveDate::from_ymd(2014, 7, 24)).ok(), Some(r#""2014-07-24""#.into())); + assert_eq!(to_string(&NaiveDate::from_ymd(0, 1, 1)).ok(), Some(r#""0000-01-01""#.into())); + assert_eq!(to_string(&NaiveDate::from_ymd(-1, 12, 31)).ok(), Some(r#""-0001-12-31""#.into())); + assert_eq!(to_string(&MIN_DATE).ok(), Some(r#""-262144-01-01""#.into())); + assert_eq!(to_string(&MAX_DATE).ok(), Some(r#""+262143-12-31""#.into())); +} + +#[cfg(all(test, any(feature = "rustc-serialize", feature = "serde")))] +fn test_decodable_json<F, E>(from_str: F) +where + F: Fn(&str) -> Result<NaiveDate, E>, + E: ::std::fmt::Debug, +{ + use std::{i32, i64}; + + assert_eq!(from_str(r#""2016-07-08""#).ok(), Some(NaiveDate::from_ymd(2016, 7, 8))); + assert_eq!(from_str(r#""2016-7-8""#).ok(), Some(NaiveDate::from_ymd(2016, 7, 8))); + assert_eq!(from_str(r#""+002016-07-08""#).ok(), Some(NaiveDate::from_ymd(2016, 7, 8))); + assert_eq!(from_str(r#""0000-01-01""#).ok(), Some(NaiveDate::from_ymd(0, 1, 1))); + assert_eq!(from_str(r#""0-1-1""#).ok(), Some(NaiveDate::from_ymd(0, 1, 1))); + assert_eq!(from_str(r#""-0001-12-31""#).ok(), Some(NaiveDate::from_ymd(-1, 12, 31))); + assert_eq!(from_str(r#""-262144-01-01""#).ok(), Some(MIN_DATE)); + assert_eq!(from_str(r#""+262143-12-31""#).ok(), Some(MAX_DATE)); + + // bad formats + assert!(from_str(r#""""#).is_err()); + assert!(from_str(r#""20001231""#).is_err()); + assert!(from_str(r#""2000-00-00""#).is_err()); + assert!(from_str(r#""2000-02-30""#).is_err()); + assert!(from_str(r#""2001-02-29""#).is_err()); + assert!(from_str(r#""2002-002-28""#).is_err()); + assert!(from_str(r#""yyyy-mm-dd""#).is_err()); + assert!(from_str(r#"0"#).is_err()); + assert!(from_str(r#"20.01"#).is_err()); + assert!(from_str(&i32::MIN.to_string()).is_err()); + assert!(from_str(&i32::MAX.to_string()).is_err()); + assert!(from_str(&i64::MIN.to_string()).is_err()); + assert!(from_str(&i64::MAX.to_string()).is_err()); + assert!(from_str(r#"{}"#).is_err()); + // pre-0.3.0 rustc-serialize format is now invalid + assert!(from_str(r#"{"ymdf":20}"#).is_err()); + assert!(from_str(r#"null"#).is_err()); +} + +#[cfg(feature = "rustc-serialize")] +mod rustc_serialize { + use super::NaiveDate; + use rustc_serialize::{Decodable, Decoder, Encodable, Encoder}; + + impl Encodable for NaiveDate { + fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error> { + format!("{:?}", self).encode(s) + } + } + + impl Decodable for NaiveDate { + fn decode<D: Decoder>(d: &mut D) -> Result<NaiveDate, D::Error> { + d.read_str()?.parse().map_err(|_| d.error("invalid date")) + } + } + + #[cfg(test)] + use rustc_serialize::json; + + #[test] + fn test_encodable() { + super::test_encodable_json(json::encode); + } + + #[test] + fn test_decodable() { + super::test_decodable_json(json::decode); + } +} + +#[cfg(feature = "serde")] +mod serde { + use super::NaiveDate; + use core::fmt; + use serdelib::{de, ser}; + + // TODO not very optimized for space (binary formats would want something better) + + impl ser::Serialize for NaiveDate { + fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> + where + S: ser::Serializer, + { + struct FormatWrapped<'a, D: 'a> { + inner: &'a D, + } + + impl<'a, D: fmt::Debug> fmt::Display for FormatWrapped<'a, D> { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + self.inner.fmt(f) + } + } + + serializer.collect_str(&FormatWrapped { inner: &self }) + } + } + + struct NaiveDateVisitor; + + impl<'de> de::Visitor<'de> for NaiveDateVisitor { + type Value = NaiveDate; + + fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { + write!(formatter, "a formatted date string") + } + + #[cfg(any(feature = "std", test))] + fn visit_str<E>(self, value: &str) -> Result<NaiveDate, E> + where + E: de::Error, + { + value.parse().map_err(E::custom) + } + + #[cfg(not(any(feature = "std", test)))] + fn visit_str<E>(self, value: &str) -> Result<NaiveDate, E> + where + E: de::Error, + { + value.parse().map_err(E::custom) + } + } + + impl<'de> de::Deserialize<'de> for NaiveDate { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: de::Deserializer<'de>, + { + deserializer.deserialize_str(NaiveDateVisitor) + } + } + + #[cfg(test)] + extern crate bincode; + #[cfg(test)] + extern crate serde_json; + + #[test] + fn test_serde_serialize() { + super::test_encodable_json(self::serde_json::to_string); + } + + #[test] + fn test_serde_deserialize() { + super::test_decodable_json(|input| self::serde_json::from_str(&input)); + } + + #[test] + fn test_serde_bincode() { + // Bincode is relevant to test separately from JSON because + // it is not self-describing. + use self::bincode::{deserialize, serialize, Infinite}; + + let d = NaiveDate::from_ymd(2014, 7, 24); + let encoded = serialize(&d, Infinite).unwrap(); + let decoded: NaiveDate = deserialize(&encoded).unwrap(); + assert_eq!(d, decoded); + } +} + +#[cfg(test)] +mod tests { + use super::NaiveDate; + use super::{MAX_DATE, MAX_DAYS_FROM_YEAR_0, MAX_YEAR}; + use super::{MIN_DATE, MIN_DAYS_FROM_YEAR_0, MIN_YEAR}; + use oldtime::Duration; + use std::{i32, u32}; + use {Datelike, Weekday}; + + #[test] + fn test_date_from_ymd() { + let ymd_opt = |y, m, d| NaiveDate::from_ymd_opt(y, m, d); + + assert!(ymd_opt(2012, 0, 1).is_none()); + assert!(ymd_opt(2012, 1, 1).is_some()); + assert!(ymd_opt(2012, 2, 29).is_some()); + assert!(ymd_opt(2014, 2, 29).is_none()); + assert!(ymd_opt(2014, 3, 0).is_none()); + assert!(ymd_opt(2014, 3, 1).is_some()); + assert!(ymd_opt(2014, 3, 31).is_some()); + assert!(ymd_opt(2014, 3, 32).is_none()); + assert!(ymd_opt(2014, 12, 31).is_some()); + assert!(ymd_opt(2014, 13, 1).is_none()); + } + + #[test] + fn test_date_from_yo() { + let yo_opt = |y, o| NaiveDate::from_yo_opt(y, o); + let ymd = |y, m, d| NaiveDate::from_ymd(y, m, d); + + assert_eq!(yo_opt(2012, 0), None); + assert_eq!(yo_opt(2012, 1), Some(ymd(2012, 1, 1))); + assert_eq!(yo_opt(2012, 2), Some(ymd(2012, 1, 2))); + assert_eq!(yo_opt(2012, 32), Some(ymd(2012, 2, 1))); + assert_eq!(yo_opt(2012, 60), Some(ymd(2012, 2, 29))); + assert_eq!(yo_opt(2012, 61), Some(ymd(2012, 3, 1))); + assert_eq!(yo_opt(2012, 100), Some(ymd(2012, 4, 9))); + assert_eq!(yo_opt(2012, 200), Some(ymd(2012, 7, 18))); + assert_eq!(yo_opt(2012, 300), Some(ymd(2012, 10, 26))); + assert_eq!(yo_opt(2012, 366), Some(ymd(2012, 12, 31))); + assert_eq!(yo_opt(2012, 367), None); + + assert_eq!(yo_opt(2014, 0), None); + assert_eq!(yo_opt(2014, 1), Some(ymd(2014, 1, 1))); + assert_eq!(yo_opt(2014, 2), Some(ymd(2014, 1, 2))); + assert_eq!(yo_opt(2014, 32), Some(ymd(2014, 2, 1))); + assert_eq!(yo_opt(2014, 59), Some(ymd(2014, 2, 28))); + assert_eq!(yo_opt(2014, 60), Some(ymd(2014, 3, 1))); + assert_eq!(yo_opt(2014, 100), Some(ymd(2014, 4, 10))); + assert_eq!(yo_opt(2014, 200), Some(ymd(2014, 7, 19))); + assert_eq!(yo_opt(2014, 300), Some(ymd(2014, 10, 27))); + assert_eq!(yo_opt(2014, 365), Some(ymd(2014, 12, 31))); + assert_eq!(yo_opt(2014, 366), None); + } + + #[test] + fn test_date_from_isoywd() { + let isoywd_opt = |y, w, d| NaiveDate::from_isoywd_opt(y, w, d); + let ymd = |y, m, d| NaiveDate::from_ymd(y, m, d); + + assert_eq!(isoywd_opt(2004, 0, Weekday::Sun), None); + assert_eq!(isoywd_opt(2004, 1, Weekday::Mon), Some(ymd(2003, 12, 29))); + assert_eq!(isoywd_opt(2004, 1, Weekday::Sun), Some(ymd(2004, 1, 4))); + assert_eq!(isoywd_opt(2004, 2, Weekday::Mon), Some(ymd(2004, 1, 5))); + assert_eq!(isoywd_opt(2004, 2, Weekday::Sun), Some(ymd(2004, 1, 11))); + assert_eq!(isoywd_opt(2004, 52, Weekday::Mon), Some(ymd(2004, 12, 20))); + assert_eq!(isoywd_opt(2004, 52, Weekday::Sun), Some(ymd(2004, 12, 26))); + assert_eq!(isoywd_opt(2004, 53, Weekday::Mon), Some(ymd(2004, 12, 27))); + assert_eq!(isoywd_opt(2004, 53, Weekday::Sun), Some(ymd(2005, 1, 2))); + assert_eq!(isoywd_opt(2004, 54, Weekday::Mon), None); + + assert_eq!(isoywd_opt(2011, 0, Weekday::Sun), None); + assert_eq!(isoywd_opt(2011, 1, Weekday::Mon), Some(ymd(2011, 1, 3))); + assert_eq!(isoywd_opt(2011, 1, Weekday::Sun), Some(ymd(2011, 1, 9))); + assert_eq!(isoywd_opt(2011, 2, Weekday::Mon), Some(ymd(2011, 1, 10))); + assert_eq!(isoywd_opt(2011, 2, Weekday::Sun), Some(ymd(2011, 1, 16))); + + assert_eq!(isoywd_opt(2018, 51, Weekday::Mon), Some(ymd(2018, 12, 17))); + assert_eq!(isoywd_opt(2018, 51, Weekday::Sun), Some(ymd(2018, 12, 23))); + assert_eq!(isoywd_opt(2018, 52, Weekday::Mon), Some(ymd(2018, 12, 24))); + assert_eq!(isoywd_opt(2018, 52, Weekday::Sun), Some(ymd(2018, 12, 30))); + assert_eq!(isoywd_opt(2018, 53, Weekday::Mon), None); + } + + #[test] + fn test_date_from_isoywd_and_iso_week() { + for year in 2000..2401 { + for week in 1..54 { + for &weekday in [ + Weekday::Mon, + Weekday::Tue, + Weekday::Wed, + Weekday::Thu, + Weekday::Fri, + Weekday::Sat, + Weekday::Sun, + ] + .iter() + { + let d = NaiveDate::from_isoywd_opt(year, week, weekday); + if d.is_some() { + let d = d.unwrap(); + assert_eq!(d.weekday(), weekday); + let w = d.iso_week(); + assert_eq!(w.year(), year); + assert_eq!(w.week(), week); + } + } + } + } + + for year in 2000..2401 { + for month in 1..13 { + for day in 1..32 { + let d = NaiveDate::from_ymd_opt(year, month, day); + if d.is_some() { + let d = d.unwrap(); + let w = d.iso_week(); + let d_ = NaiveDate::from_isoywd(w.year(), w.week(), d.weekday()); + assert_eq!(d, d_); + } + } + } + } + } + + #[test] + fn test_date_from_num_days_from_ce() { + let from_ndays_from_ce = |days| NaiveDate::from_num_days_from_ce_opt(days); + assert_eq!(from_ndays_from_ce(1), Some(NaiveDate::from_ymd(1, 1, 1))); + assert_eq!(from_ndays_from_ce(2), Some(NaiveDate::from_ymd(1, 1, 2))); + assert_eq!(from_ndays_from_ce(31), Some(NaiveDate::from_ymd(1, 1, 31))); + assert_eq!(from_ndays_from_ce(32), Some(NaiveDate::from_ymd(1, 2, 1))); + assert_eq!(from_ndays_from_ce(59), Some(NaiveDate::from_ymd(1, 2, 28))); + assert_eq!(from_ndays_from_ce(60), Some(NaiveDate::from_ymd(1, 3, 1))); + assert_eq!(from_ndays_from_ce(365), Some(NaiveDate::from_ymd(1, 12, 31))); + assert_eq!(from_ndays_from_ce(365 * 1 + 1), Some(NaiveDate::from_ymd(2, 1, 1))); + assert_eq!(from_ndays_from_ce(365 * 2 + 1), Some(NaiveDate::from_ymd(3, 1, 1))); + assert_eq!(from_ndays_from_ce(365 * 3 + 1), Some(NaiveDate::from_ymd(4, 1, 1))); + assert_eq!(from_ndays_from_ce(365 * 4 + 2), Some(NaiveDate::from_ymd(5, 1, 1))); + assert_eq!(from_ndays_from_ce(146097 + 1), Some(NaiveDate::from_ymd(401, 1, 1))); + assert_eq!(from_ndays_from_ce(146097 * 5 + 1), Some(NaiveDate::from_ymd(2001, 1, 1))); + assert_eq!(from_ndays_from_ce(719163), Some(NaiveDate::from_ymd(1970, 1, 1))); + assert_eq!(from_ndays_from_ce(0), Some(NaiveDate::from_ymd(0, 12, 31))); // 1 BCE + assert_eq!(from_ndays_from_ce(-365), Some(NaiveDate::from_ymd(0, 1, 1))); + assert_eq!(from_ndays_from_ce(-366), Some(NaiveDate::from_ymd(-1, 12, 31))); // 2 BCE + + for days in (-9999..10001).map(|x| x * 100) { + assert_eq!(from_ndays_from_ce(days).map(|d| d.num_days_from_ce()), Some(days)); + } + + assert_eq!(from_ndays_from_ce(MIN_DATE.num_days_from_ce()), Some(MIN_DATE)); + assert_eq!(from_ndays_from_ce(MIN_DATE.num_days_from_ce() - 1), None); + assert_eq!(from_ndays_from_ce(MAX_DATE.num_days_from_ce()), Some(MAX_DATE)); + assert_eq!(from_ndays_from_ce(MAX_DATE.num_days_from_ce() + 1), None); + } + + #[test] + fn test_date_from_weekday_of_month_opt() { + let ymwd = |y, m, w, n| NaiveDate::from_weekday_of_month_opt(y, m, w, n); + assert_eq!(ymwd(2018, 8, Weekday::Tue, 0), None); + assert_eq!(ymwd(2018, 8, Weekday::Wed, 1), Some(NaiveDate::from_ymd(2018, 8, 1))); + assert_eq!(ymwd(2018, 8, Weekday::Thu, 1), Some(NaiveDate::from_ymd(2018, 8, 2))); + assert_eq!(ymwd(2018, 8, Weekday::Sun, 1), Some(NaiveDate::from_ymd(2018, 8, 5))); + assert_eq!(ymwd(2018, 8, Weekday::Mon, 1), Some(NaiveDate::from_ymd(2018, 8, 6))); + assert_eq!(ymwd(2018, 8, Weekday::Tue, 1), Some(NaiveDate::from_ymd(2018, 8, 7))); + assert_eq!(ymwd(2018, 8, Weekday::Wed, 2), Some(NaiveDate::from_ymd(2018, 8, 8))); + assert_eq!(ymwd(2018, 8, Weekday::Sun, 2), Some(NaiveDate::from_ymd(2018, 8, 12))); + assert_eq!(ymwd(2018, 8, Weekday::Thu, 3), Some(NaiveDate::from_ymd(2018, 8, 16))); + assert_eq!(ymwd(2018, 8, Weekday::Thu, 4), Some(NaiveDate::from_ymd(2018, 8, 23))); + assert_eq!(ymwd(2018, 8, Weekday::Thu, 5), Some(NaiveDate::from_ymd(2018, 8, 30))); + assert_eq!(ymwd(2018, 8, Weekday::Fri, 5), Some(NaiveDate::from_ymd(2018, 8, 31))); + assert_eq!(ymwd(2018, 8, Weekday::Sat, 5), None); + } + + #[test] + fn test_date_fields() { + fn check(year: i32, month: u32, day: u32, ordinal: u32) { + let d1 = NaiveDate::from_ymd(year, month, day); + assert_eq!(d1.year(), year); + assert_eq!(d1.month(), month); + assert_eq!(d1.day(), day); + assert_eq!(d1.ordinal(), ordinal); + + let d2 = NaiveDate::from_yo(year, ordinal); + assert_eq!(d2.year(), year); + assert_eq!(d2.month(), month); + assert_eq!(d2.day(), day); + assert_eq!(d2.ordinal(), ordinal); + + assert_eq!(d1, d2); + } + + check(2012, 1, 1, 1); + check(2012, 1, 2, 2); + check(2012, 2, 1, 32); + check(2012, 2, 29, 60); + check(2012, 3, 1, 61); + check(2012, 4, 9, 100); + check(2012, 7, 18, 200); + check(2012, 10, 26, 300); + check(2012, 12, 31, 366); + + check(2014, 1, 1, 1); + check(2014, 1, 2, 2); + check(2014, 2, 1, 32); + check(2014, 2, 28, 59); + check(2014, 3, 1, 60); + check(2014, 4, 10, 100); + check(2014, 7, 19, 200); + check(2014, 10, 27, 300); + check(2014, 12, 31, 365); + } + + #[test] + fn test_date_weekday() { + assert_eq!(NaiveDate::from_ymd(1582, 10, 15).weekday(), Weekday::Fri); + // May 20, 1875 = ISO 8601 reference date + assert_eq!(NaiveDate::from_ymd(1875, 5, 20).weekday(), Weekday::Thu); + assert_eq!(NaiveDate::from_ymd(2000, 1, 1).weekday(), Weekday::Sat); + } + + #[test] + fn test_date_with_fields() { + let d = NaiveDate::from_ymd(2000, 2, 29); + assert_eq!(d.with_year(-400), Some(NaiveDate::from_ymd(-400, 2, 29))); + assert_eq!(d.with_year(-100), None); + assert_eq!(d.with_year(1600), Some(NaiveDate::from_ymd(1600, 2, 29))); + assert_eq!(d.with_year(1900), None); + assert_eq!(d.with_year(2000), Some(NaiveDate::from_ymd(2000, 2, 29))); + assert_eq!(d.with_year(2001), None); + assert_eq!(d.with_year(2004), Some(NaiveDate::from_ymd(2004, 2, 29))); + assert_eq!(d.with_year(i32::MAX), None); + + let d = NaiveDate::from_ymd(2000, 4, 30); + assert_eq!(d.with_month(0), None); + assert_eq!(d.with_month(1), Some(NaiveDate::from_ymd(2000, 1, 30))); + assert_eq!(d.with_month(2), None); + assert_eq!(d.with_month(3), Some(NaiveDate::from_ymd(2000, 3, 30))); + assert_eq!(d.with_month(4), Some(NaiveDate::from_ymd(2000, 4, 30))); + assert_eq!(d.with_month(12), Some(NaiveDate::from_ymd(2000, 12, 30))); + assert_eq!(d.with_month(13), None); + assert_eq!(d.with_month(u32::MAX), None); + + let d = NaiveDate::from_ymd(2000, 2, 8); + assert_eq!(d.with_day(0), None); + assert_eq!(d.with_day(1), Some(NaiveDate::from_ymd(2000, 2, 1))); + assert_eq!(d.with_day(29), Some(NaiveDate::from_ymd(2000, 2, 29))); + assert_eq!(d.with_day(30), None); + assert_eq!(d.with_day(u32::MAX), None); + + let d = NaiveDate::from_ymd(2000, 5, 5); + assert_eq!(d.with_ordinal(0), None); + assert_eq!(d.with_ordinal(1), Some(NaiveDate::from_ymd(2000, 1, 1))); + assert_eq!(d.with_ordinal(60), Some(NaiveDate::from_ymd(2000, 2, 29))); + assert_eq!(d.with_ordinal(61), Some(NaiveDate::from_ymd(2000, 3, 1))); + assert_eq!(d.with_ordinal(366), Some(NaiveDate::from_ymd(2000, 12, 31))); + assert_eq!(d.with_ordinal(367), None); + assert_eq!(d.with_ordinal(u32::MAX), None); + } + + #[test] + fn test_date_num_days_from_ce() { + assert_eq!(NaiveDate::from_ymd(1, 1, 1).num_days_from_ce(), 1); + + for year in -9999..10001 { + assert_eq!( + NaiveDate::from_ymd(year, 1, 1).num_days_from_ce(), + NaiveDate::from_ymd(year - 1, 12, 31).num_days_from_ce() + 1 + ); + } + } + + #[test] + fn test_date_succ() { + let ymd = |y, m, d| NaiveDate::from_ymd(y, m, d); + assert_eq!(ymd(2014, 5, 6).succ_opt(), Some(ymd(2014, 5, 7))); + assert_eq!(ymd(2014, 5, 31).succ_opt(), Some(ymd(2014, 6, 1))); + assert_eq!(ymd(2014, 12, 31).succ_opt(), Some(ymd(2015, 1, 1))); + assert_eq!(ymd(2016, 2, 28).succ_opt(), Some(ymd(2016, 2, 29))); + assert_eq!(ymd(MAX_DATE.year(), 12, 31).succ_opt(), None); + } + + #[test] + fn test_date_pred() { + let ymd = |y, m, d| NaiveDate::from_ymd(y, m, d); + assert_eq!(ymd(2016, 3, 1).pred_opt(), Some(ymd(2016, 2, 29))); + assert_eq!(ymd(2015, 1, 1).pred_opt(), Some(ymd(2014, 12, 31))); + assert_eq!(ymd(2014, 6, 1).pred_opt(), Some(ymd(2014, 5, 31))); + assert_eq!(ymd(2014, 5, 7).pred_opt(), Some(ymd(2014, 5, 6))); + assert_eq!(ymd(MIN_DATE.year(), 1, 1).pred_opt(), None); + } + + #[test] + fn test_date_add() { + fn check((y1, m1, d1): (i32, u32, u32), rhs: Duration, ymd: Option<(i32, u32, u32)>) { + let lhs = NaiveDate::from_ymd(y1, m1, d1); + let sum = ymd.map(|(y, m, d)| NaiveDate::from_ymd(y, m, d)); + assert_eq!(lhs.checked_add_signed(rhs), sum); + assert_eq!(lhs.checked_sub_signed(-rhs), sum); + } + + check((2014, 1, 1), Duration::zero(), Some((2014, 1, 1))); + check((2014, 1, 1), Duration::seconds(86399), Some((2014, 1, 1))); + // always round towards zero + check((2014, 1, 1), Duration::seconds(-86399), Some((2014, 1, 1))); + check((2014, 1, 1), Duration::days(1), Some((2014, 1, 2))); + check((2014, 1, 1), Duration::days(-1), Some((2013, 12, 31))); + check((2014, 1, 1), Duration::days(364), Some((2014, 12, 31))); + check((2014, 1, 1), Duration::days(365 * 4 + 1), Some((2018, 1, 1))); + check((2014, 1, 1), Duration::days(365 * 400 + 97), Some((2414, 1, 1))); + + check((-7, 1, 1), Duration::days(365 * 12 + 3), Some((5, 1, 1))); + + // overflow check + check((0, 1, 1), Duration::days(MAX_DAYS_FROM_YEAR_0 as i64), Some((MAX_YEAR, 12, 31))); + check((0, 1, 1), Duration::days(MAX_DAYS_FROM_YEAR_0 as i64 + 1), None); + check((0, 1, 1), Duration::max_value(), None); + check((0, 1, 1), Duration::days(MIN_DAYS_FROM_YEAR_0 as i64), Some((MIN_YEAR, 1, 1))); + check((0, 1, 1), Duration::days(MIN_DAYS_FROM_YEAR_0 as i64 - 1), None); + check((0, 1, 1), Duration::min_value(), None); + } + + #[test] + fn test_date_sub() { + fn check((y1, m1, d1): (i32, u32, u32), (y2, m2, d2): (i32, u32, u32), diff: Duration) { + let lhs = NaiveDate::from_ymd(y1, m1, d1); + let rhs = NaiveDate::from_ymd(y2, m2, d2); + assert_eq!(lhs.signed_duration_since(rhs), diff); + assert_eq!(rhs.signed_duration_since(lhs), -diff); + } + + check((2014, 1, 1), (2014, 1, 1), Duration::zero()); + check((2014, 1, 2), (2014, 1, 1), Duration::days(1)); + check((2014, 12, 31), (2014, 1, 1), Duration::days(364)); + check((2015, 1, 3), (2014, 1, 1), Duration::days(365 + 2)); + check((2018, 1, 1), (2014, 1, 1), Duration::days(365 * 4 + 1)); + check((2414, 1, 1), (2014, 1, 1), Duration::days(365 * 400 + 97)); + + check((MAX_YEAR, 12, 31), (0, 1, 1), Duration::days(MAX_DAYS_FROM_YEAR_0 as i64)); + check((MIN_YEAR, 1, 1), (0, 1, 1), Duration::days(MIN_DAYS_FROM_YEAR_0 as i64)); + } + + #[test] + fn test_date_addassignment() { + let ymd = NaiveDate::from_ymd; + let mut date = ymd(2016, 10, 1); + date += Duration::days(10); + assert_eq!(date, ymd(2016, 10, 11)); + date += Duration::days(30); + assert_eq!(date, ymd(2016, 11, 10)); + } + + #[test] + fn test_date_subassignment() { + let ymd = NaiveDate::from_ymd; + let mut date = ymd(2016, 10, 11); + date -= Duration::days(10); + assert_eq!(date, ymd(2016, 10, 1)); + date -= Duration::days(2); + assert_eq!(date, ymd(2016, 9, 29)); + } + + #[test] + fn test_date_fmt() { + assert_eq!(format!("{:?}", NaiveDate::from_ymd(2012, 3, 4)), "2012-03-04"); + assert_eq!(format!("{:?}", NaiveDate::from_ymd(0, 3, 4)), "0000-03-04"); + assert_eq!(format!("{:?}", NaiveDate::from_ymd(-307, 3, 4)), "-0307-03-04"); + assert_eq!(format!("{:?}", NaiveDate::from_ymd(12345, 3, 4)), "+12345-03-04"); + + assert_eq!(NaiveDate::from_ymd(2012, 3, 4).to_string(), "2012-03-04"); + assert_eq!(NaiveDate::from_ymd(0, 3, 4).to_string(), "0000-03-04"); + assert_eq!(NaiveDate::from_ymd(-307, 3, 4).to_string(), "-0307-03-04"); + assert_eq!(NaiveDate::from_ymd(12345, 3, 4).to_string(), "+12345-03-04"); + + // the format specifier should have no effect on `NaiveTime` + assert_eq!(format!("{:+30?}", NaiveDate::from_ymd(1234, 5, 6)), "1234-05-06"); + assert_eq!(format!("{:30?}", NaiveDate::from_ymd(12345, 6, 7)), "+12345-06-07"); + } + + #[test] + fn test_date_from_str() { + // valid cases + let valid = [ + "-0000000123456-1-2", + " -123456 - 1 - 2 ", + "-12345-1-2", + "-1234-12-31", + "-7-6-5", + "350-2-28", + "360-02-29", + "0360-02-29", + "2015-2 -18", + "+70-2-18", + "+70000-2-18", + "+00007-2-18", + ]; + for &s in &valid { + let d = match s.parse::<NaiveDate>() { + Ok(d) => d, + Err(e) => panic!("parsing `{}` has failed: {}", s, e), + }; + let s_ = format!("{:?}", d); + // `s` and `s_` may differ, but `s.parse()` and `s_.parse()` must be same + let d_ = match s_.parse::<NaiveDate>() { + Ok(d) => d, + Err(e) => { + panic!("`{}` is parsed into `{:?}`, but reparsing that has failed: {}", s, d, e) + } + }; + assert!( + d == d_, + "`{}` is parsed into `{:?}`, but reparsed result \ + `{:?}` does not match", + s, + d, + d_ + ); + } + + // some invalid cases + // since `ParseErrorKind` is private, all we can do is to check if there was an error + assert!("".parse::<NaiveDate>().is_err()); + assert!("x".parse::<NaiveDate>().is_err()); + assert!("2014".parse::<NaiveDate>().is_err()); + assert!("2014-01".parse::<NaiveDate>().is_err()); + assert!("2014-01-00".parse::<NaiveDate>().is_err()); + assert!("2014-13-57".parse::<NaiveDate>().is_err()); + assert!("9999999-9-9".parse::<NaiveDate>().is_err()); // out-of-bounds + } + + #[test] + fn test_date_parse_from_str() { + let ymd = |y, m, d| NaiveDate::from_ymd(y, m, d); + assert_eq!( + NaiveDate::parse_from_str("2014-5-7T12:34:56+09:30", "%Y-%m-%dT%H:%M:%S%z"), + Ok(ymd(2014, 5, 7)) + ); // ignore time and offset + assert_eq!( + NaiveDate::parse_from_str("2015-W06-1=2015-033", "%G-W%V-%u = %Y-%j"), + Ok(ymd(2015, 2, 2)) + ); + assert_eq!( + NaiveDate::parse_from_str("Fri, 09 Aug 13", "%a, %d %b %y"), + Ok(ymd(2013, 8, 9)) + ); + assert!(NaiveDate::parse_from_str("Sat, 09 Aug 2013", "%a, %d %b %Y").is_err()); + assert!(NaiveDate::parse_from_str("2014-57", "%Y-%m-%d").is_err()); + assert!(NaiveDate::parse_from_str("2014", "%Y").is_err()); // insufficient + } + + #[test] + fn test_date_format() { + let d = NaiveDate::from_ymd(2012, 3, 4); + assert_eq!(d.format("%Y,%C,%y,%G,%g").to_string(), "2012,20,12,2012,12"); + assert_eq!(d.format("%m,%b,%h,%B").to_string(), "03,Mar,Mar,March"); + assert_eq!(d.format("%d,%e").to_string(), "04, 4"); + assert_eq!(d.format("%U,%W,%V").to_string(), "10,09,09"); + assert_eq!(d.format("%a,%A,%w,%u").to_string(), "Sun,Sunday,0,7"); + assert_eq!(d.format("%j").to_string(), "064"); // since 2012 is a leap year + assert_eq!(d.format("%D,%x").to_string(), "03/04/12,03/04/12"); + assert_eq!(d.format("%F").to_string(), "2012-03-04"); + assert_eq!(d.format("%v").to_string(), " 4-Mar-2012"); + assert_eq!(d.format("%t%n%%%n%t").to_string(), "\t\n%\n\t"); + + // non-four-digit years + assert_eq!(NaiveDate::from_ymd(12345, 1, 1).format("%Y").to_string(), "+12345"); + assert_eq!(NaiveDate::from_ymd(1234, 1, 1).format("%Y").to_string(), "1234"); + assert_eq!(NaiveDate::from_ymd(123, 1, 1).format("%Y").to_string(), "0123"); + assert_eq!(NaiveDate::from_ymd(12, 1, 1).format("%Y").to_string(), "0012"); + assert_eq!(NaiveDate::from_ymd(1, 1, 1).format("%Y").to_string(), "0001"); + assert_eq!(NaiveDate::from_ymd(0, 1, 1).format("%Y").to_string(), "0000"); + assert_eq!(NaiveDate::from_ymd(-1, 1, 1).format("%Y").to_string(), "-0001"); + assert_eq!(NaiveDate::from_ymd(-12, 1, 1).format("%Y").to_string(), "-0012"); + assert_eq!(NaiveDate::from_ymd(-123, 1, 1).format("%Y").to_string(), "-0123"); + assert_eq!(NaiveDate::from_ymd(-1234, 1, 1).format("%Y").to_string(), "-1234"); + assert_eq!(NaiveDate::from_ymd(-12345, 1, 1).format("%Y").to_string(), "-12345"); + + // corner cases + assert_eq!( + NaiveDate::from_ymd(2007, 12, 31).format("%G,%g,%U,%W,%V").to_string(), + "2008,08,53,53,01" + ); + assert_eq!( + NaiveDate::from_ymd(2010, 1, 3).format("%G,%g,%U,%W,%V").to_string(), + "2009,09,01,00,53" + ); + } + + #[test] + fn test_day_iterator_limit() { + assert_eq!( + NaiveDate::from_ymd(262143, 12, 29).iter_days().take(4).collect::<Vec<_>>().len(), + 2 + ); + } + + #[test] + fn test_week_iterator_limit() { + assert_eq!( + NaiveDate::from_ymd(262143, 12, 12).iter_weeks().take(4).collect::<Vec<_>>().len(), + 2 + ); + } +} |