Struct chrono::naive::date::NaiveDate
[−]
[src]
pub struct NaiveDate {
// some fields omitted
}ISO 8601 calendar date without timezone. Allows for every proleptic Gregorian date from Jan 1, 262145 BCE to Dec 31, 262143 CE. Also supports the conversion from ISO 8601 ordinal and week date.
Methods
impl NaiveDate
fn from_ymd(year: i32, month: u32, day: u32) -> NaiveDate
Makes a new NaiveDate from year, month and day.
This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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.isoweekdate(), (2015, 11, Weekday::Sat)); // ISO week and weekday assert_eq!(d.num_days_from_ce(), 735671); // days since January 1, 1 CE
fn from_ymd_opt(year: i32, month: u32, day: u32) -> Option<NaiveDate>
Makes a new NaiveDate from year, month and day.
This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
Returns None on the out-of-range date, invalid month and/or day.
Example
use chrono::NaiveDate; let ymd = |y,m,d| NaiveDate::from_ymd_opt(y, m, d); assert!(ymd(2015, 3, 14).is_some()); assert!(ymd(2015, 0, 14).is_none()); assert!(ymd(2015, 2, 29).is_none()); assert!(ymd(-4, 2, 29).is_some()); // 5 BCE is a leap year assert!(ymd(400000, 1, 1).is_none()); assert!(ymd(-400000, 1, 1).is_none());
fn from_yo(year: i32, ordinal: u32) -> NaiveDate
Makes a new NaiveDate from year and day of year (DOY or "ordinal").
This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
Panics on the out-of-range date and/or invalid DOY.
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.isoweekdate(), (2015, 11, Weekday::Sat)); // ISO week and weekday assert_eq!(d.num_days_from_ce(), 735671); // days since January 1, 1 CE
fn from_yo_opt(year: i32, ordinal: u32) -> Option<NaiveDate>
Makes a new NaiveDate from year and day of year (DOY or "ordinal").
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; let yo = |y,o| NaiveDate::from_yo_opt(y, o); assert!(yo(2015, 100).is_some()); assert!(yo(2015, 0).is_none()); assert!(yo(2015, 365).is_some()); assert!(yo(2015, 366).is_none()); assert!(yo(-4, 366).is_some()); // 5 BCE is a leap year assert!(yo(400000, 1).is_none()); assert!(yo(-400000, 1).is_none());
fn from_isoywd(year: i32, week: u32, weekday: Weekday) -> NaiveDate
Makes a new NaiveDate from ISO week date (year and week number) and day of the week (DOW).
This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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.isoweekdate(), (2015, 11, 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
fn from_isoywd_opt(year: i32, week: u32, weekday: Weekday) -> Option<NaiveDate>
Makes a new NaiveDate from ISO week date (year and week number) and day of the week (DOW).
This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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 ymd = |y,m,d| NaiveDate::from_ymd(y, m, d); let isoywd = |y,w,d| NaiveDate::from_isoywd_opt(y, w, d); assert_eq!(isoywd(2015, 0, Weekday::Sun), None); assert_eq!(isoywd(2015, 10, Weekday::Sun), Some(ymd(2015, 3, 8))); assert_eq!(isoywd(2015, 30, Weekday::Mon), Some(ymd(2015, 7, 20))); assert_eq!(isoywd(2015, 60, Weekday::Mon), None); // out-of-range dates assert_eq!(isoywd(400000, 10, Weekday::Fri), None); assert_eq!(isoywd(-400000, 10, Weekday::Sat), None); // year boundary behaviors // // 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!(isoywd(2014, 52, Weekday::Sun), Some(ymd(2014, 12, 28))); assert_eq!(isoywd(2014, 53, Weekday::Mon), None); assert_eq!(isoywd(2015, 1, Weekday::Mon), Some(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!(isoywd(2015, 52, Weekday::Sun), Some(ymd(2015, 12, 27))); assert_eq!(isoywd(2015, 53, Weekday::Sun), Some(ymd(2016, 1, 3))); assert_eq!(isoywd(2015, 54, Weekday::Mon), None); assert_eq!(isoywd(2016, 1, Weekday::Mon), Some(ymd(2016, 1, 4)));
fn from_num_days_from_ce(days: i32) -> NaiveDate
Makes a new NaiveDate from the number of days since January 1, 1 (Day 1)
in the proleptic Gregorian calendar.
Panics on the out-of-range date.
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.isoweekdate(), (2015, 11, Weekday::Sat)); // ISO week and weekday
fn from_num_days_from_ce_opt(days: i32) -> Option<NaiveDate>
Makes a new NaiveDate from the number of days since January 1, 1 (Day 1)
in the proleptic Gregorian calendar.
Returns None on the out-of-range date.
Example
use chrono::NaiveDate; let days = |ndays| NaiveDate::from_num_days_from_ce_opt(ndays); assert_eq!(days(730000), Some(NaiveDate::from_ymd(1999, 9, 3))); assert_eq!(days(1), Some(NaiveDate::from_ymd(1, 1, 1))); assert_eq!(days(0), Some(NaiveDate::from_ymd(0, 12, 31))); assert_eq!(days(-1), Some(NaiveDate::from_ymd(0, 12, 30))); assert_eq!(days(100000000), None); assert_eq!(days(-100000000), None);
fn parse_from_str(s: &str, fmt: &str) -> ParseResult<NaiveDate>
Parses a string with the specified format string and returns a new NaiveDate.
See the format::strftime module
on the supported escape sequences.
Example
use chrono::NaiveDate; assert_eq!(NaiveDate::parse_from_str("2015-09-05", "%Y-%m-%d"), Ok(NaiveDate::from_ymd(2015, 9, 5))); assert_eq!(NaiveDate::parse_from_str("5sep2015", "%d%b%Y"), Ok(NaiveDate::from_ymd(2015, 9, 5)));
Time and offset is ignored for the purpose of parsing.
assert_eq!(NaiveDate::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.
assert!(NaiveDate::parse_from_str("2015/9", "%Y/%m").is_err()); assert!(NaiveDate::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.
assert!(NaiveDate::parse_from_str("Sat, 09 Aug 2013", "%a, %d %b %Y").is_err());
fn and_time(&self, time: NaiveTime) -> NaiveDateTime
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);
fn and_hms(&self, hour: u32, min: u32, sec: u32) -> NaiveDateTime
Makes a new NaiveDateTime from the current date, hour, minute and second.
No leap second 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);
fn and_hms_opt(&self, hour: u32, min: u32, sec: u32) -> Option<NaiveDateTime>
Makes a new NaiveDateTime from the current date, hour, minute and second.
No leap second 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());
fn and_hms_milli(&self, hour: u32, min: u32, sec: u32, milli: u32) -> NaiveDateTime
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.
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);
fn and_hms_milli_opt(&self, hour: u32, min: u32, sec: u32, milli: u32) -> Option<NaiveDateTime>
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.
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());
fn and_hms_micro(&self, hour: u32, min: u32, sec: u32, micro: u32) -> NaiveDateTime
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.
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);
fn and_hms_micro_opt(&self, hour: u32, min: u32, sec: u32, micro: u32) -> Option<NaiveDateTime>
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.
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());
fn and_hms_nano(&self, hour: u32, min: u32, sec: u32, nano: u32) -> NaiveDateTime
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.
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);
fn and_hms_nano_opt(&self, hour: u32, min: u32, sec: u32, nano: u32) -> Option<NaiveDateTime>
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.
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());
fn succ(&self) -> NaiveDate
Makes a new NaiveDate for the next 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));
fn succ_opt(&self) -> Option<NaiveDate>
Makes a new NaiveDate for the next date.
Returns None when self is the last representable date.
Example
use chrono::NaiveDate; use chrono::naive::date::MAX; assert_eq!(NaiveDate::from_ymd(2015, 6, 3).succ_opt(), Some(NaiveDate::from_ymd(2015, 6, 4))); assert_eq!(MAX.succ_opt(), None);
fn pred(&self) -> NaiveDate
Makes a new NaiveDate for the prior 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));
fn pred_opt(&self) -> Option<NaiveDate>
Makes a new NaiveDate for the prior date.
Returns None when self is the first representable date.
Example
use chrono::NaiveDate; use chrono::naive::date::MIN; assert_eq!(NaiveDate::from_ymd(2015, 6, 3).pred_opt(), Some(NaiveDate::from_ymd(2015, 6, 2))); assert_eq!(MIN.pred_opt(), None);
fn checked_add(self, rhs: Duration) -> Option<NaiveDate>
Adds the days part of given Duration to the current date.
Returns None when it will result in overflow.
Example
use chrono::{NaiveDate, Duration}; use chrono::naive::date::MAX; let d = NaiveDate::from_ymd(2015, 9, 5); assert_eq!(d.checked_add(Duration::days(40)), Some(NaiveDate::from_ymd(2015, 10, 15))); assert_eq!(d.checked_add(Duration::days(-40)), Some(NaiveDate::from_ymd(2015, 7, 27))); assert_eq!(d.checked_add(Duration::days(1000_000_000)), None); assert_eq!(d.checked_add(Duration::days(-1000_000_000)), None); assert_eq!(MAX.checked_add(Duration::days(1)), None);
fn checked_sub(self, rhs: Duration) -> Option<NaiveDate>
Subtracts the days part of given Duration from the current date.
Returns None when it will result in overflow.
Example
use chrono::{NaiveDate, Duration}; use chrono::naive::date::MIN; let d = NaiveDate::from_ymd(2015, 9, 5); assert_eq!(d.checked_sub(Duration::days(40)), Some(NaiveDate::from_ymd(2015, 7, 27))); assert_eq!(d.checked_sub(Duration::days(-40)), Some(NaiveDate::from_ymd(2015, 10, 15))); assert_eq!(d.checked_sub(Duration::days(1000_000_000)), None); assert_eq!(d.checked_sub(Duration::days(-1000_000_000)), None); assert_eq!(MIN.checked_sub(Duration::days(1)), None);
fn format_with_items<'a, I>(&self, items: I) -> DelayedFormat<I> where I: Iterator<Item=Item<'a>> + Clone
Formats the date with the specified formatting items.
Otherwise it is same to the ordinary format method.
The Iterator of items should be Cloneable,
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");
fn format<'a>(&self, fmt: &'a str) -> DelayedFormat<StrftimeItems<'a>>
Formats the date with the specified format string.
See the format::strftime module
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");
Trait Implementations
impl Datelike for NaiveDate
fn year(&self) -> i32
fn month(&self) -> u32
fn month0(&self) -> u32
fn day(&self) -> u32
fn day0(&self) -> u32
fn ordinal(&self) -> u32
fn ordinal0(&self) -> u32
fn weekday(&self) -> Weekday
fn isoweekdate(&self) -> (i32, u32, Weekday)
fn with_year(&self, year: i32) -> Option<NaiveDate>
fn with_month(&self, month: u32) -> Option<NaiveDate>
fn with_month0(&self, month0: u32) -> Option<NaiveDate>
fn with_day(&self, day: u32) -> Option<NaiveDate>
fn with_day0(&self, day0: u32) -> Option<NaiveDate>
fn with_ordinal(&self, ordinal: u32) -> Option<NaiveDate>
fn with_ordinal0(&self, ordinal0: u32) -> Option<NaiveDate>
fn year_ce(&self) -> (bool, u32)
fn num_days_from_ce(&self) -> i32
impl Hash for NaiveDate
fn hash<H: Hasher>(&self, state: &mut H)
1.3.0fn hash_slice<H>(data: &[Self], state: &mut H) where H: Hasher
impl Add<Duration> for NaiveDate
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 for detecting that.
Example
use chrono::{NaiveDate, Duration}; let ymd = |y,m,d| NaiveDate::from_ymd(y, m, d); assert_eq!(ymd(2014, 1, 1) + Duration::zero(), ymd(2014, 1, 1)); assert_eq!(ymd(2014, 1, 1) + Duration::seconds(86399), ymd(2014, 1, 1)); assert_eq!(ymd(2014, 1, 1) + Duration::seconds(-86399), ymd(2014, 1, 1)); assert_eq!(ymd(2014, 1, 1) + Duration::days(1), ymd(2014, 1, 2)); assert_eq!(ymd(2014, 1, 1) + Duration::days(-1), ymd(2013, 12, 31)); assert_eq!(ymd(2014, 1, 1) + Duration::days(364), ymd(2014, 12, 31)); assert_eq!(ymd(2014, 1, 1) + Duration::days(365*4 + 1), ymd(2018, 1, 1)); assert_eq!(ymd(2014, 1, 1) + Duration::days(365*400 + 97), ymd(2414, 1, 1));
impl Sub<NaiveDate> for NaiveDate
A subtraction of NaiveDate from NaiveDate yields a Duration of integral numbers,
and does not overflow or underflow at all.
Example
use chrono::{NaiveDate, Duration}; let ymd = |y,m,d| NaiveDate::from_ymd(y, m, d); assert_eq!(ymd(2014, 1, 1) - ymd(2014, 1, 1), Duration::zero()); assert_eq!(ymd(2014, 1, 1) - ymd(2013, 12, 31), Duration::days(1)); assert_eq!(ymd(2014, 1, 1) - ymd(2014, 1, 2), Duration::days(-1)); assert_eq!(ymd(2014, 1, 1) - ymd(2013, 9, 23), Duration::days(100)); assert_eq!(ymd(2014, 1, 1) - ymd(2013, 1, 1), Duration::days(365)); assert_eq!(ymd(2014, 1, 1) - ymd(2010, 1, 1), Duration::days(365*4 + 1)); assert_eq!(ymd(2014, 1, 1) - ymd(1614, 1, 1), Duration::days(365*400 + 97));
impl Sub<Duration> for NaiveDate
A subtraction of Duration from NaiveDate discards the fractional days,
rounding to the closest integral number of days towards Duration::zero().
Panics on underflow or overflow.
Use NaiveDate::checked_sub for detecting that.
Example
use chrono::{NaiveDate, Duration}; let ymd = |y,m,d| NaiveDate::from_ymd(y, m, d); assert_eq!(ymd(2014, 1, 1) - Duration::zero(), ymd(2014, 1, 1)); assert_eq!(ymd(2014, 1, 1) - Duration::seconds(86399), ymd(2014, 1, 1)); assert_eq!(ymd(2014, 1, 1) - Duration::seconds(-86399), ymd(2014, 1, 1)); assert_eq!(ymd(2014, 1, 1) - Duration::days(1), ymd(2013, 12, 31)); assert_eq!(ymd(2014, 1, 1) - Duration::days(-1), ymd(2014, 1, 2)); assert_eq!(ymd(2014, 1, 1) - Duration::days(364), ymd(2013, 1, 2)); assert_eq!(ymd(2014, 1, 1) - Duration::days(365*4 + 1), ymd(2010, 1, 1)); assert_eq!(ymd(2014, 1, 1) - Duration::days(365*400 + 97), ymd(1614, 1, 1));
impl Debug for NaiveDate
The Debug output of the naive date d is same to d.format("%Y-%m-%d").
Note that ISO 8601 requires an explicit sign for years before 1 BCE or after 9999 CE.
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"); // examples of an explicit year sign 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 Display for NaiveDate
The Display output of the naive date d is same to d.format("%Y-%m-%d").
Note that ISO 8601 requires an explicit sign for years before 1 BCE or after 9999 CE.
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"); // examples of an explicit year sign 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 FromStr for NaiveDate
Parsing a str into a NaiveDate uses the same format, %Y-%m-%d, as Debug and Display.
Example
use chrono::NaiveDate; let d = NaiveDate::from_ymd(2015, 9, 18); assert_eq!(format!("{}", d).parse::<NaiveDate>(), Ok(d)); let d = NaiveDate::from_ymd(12345, 6, 7); assert_eq!(format!("{}", d).parse::<NaiveDate>(), Ok(d)); assert!("foo".parse::<NaiveDate>().is_err());