533 lines
20 KiB
Rust
533 lines
20 KiB
Rust
// This is a part of Chrono.
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// See README.md and LICENSE.txt for details.
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//! The time zone, which calculates offsets from the local time to UTC.
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//!
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//! There are four operations provided by the `TimeZone` trait:
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//!
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//! 1. Converting the local `NaiveDateTime` to `DateTime<Tz>`
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//! 2. Converting the UTC `NaiveDateTime` to `DateTime<Tz>`
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//! 3. Converting `DateTime<Tz>` to the local `NaiveDateTime`
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//! 4. Constructing `DateTime<Tz>` objects from various offsets
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//!
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//! 1 is used for constructors. 2 is used for the `with_timezone` method of date and time types.
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//! 3 is used for other methods, e.g. `year()` or `format()`, and provided by an associated type
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//! which implements `Offset` (which then passed to `TimeZone` for actual implementations).
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//! Technically speaking `TimeZone` has a total knowledge about given timescale,
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//! but `Offset` is used as a cache to avoid the repeated conversion
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//! and provides implementations for 1 and 3.
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//! An `TimeZone` instance can be reconstructed from the corresponding `Offset` instance.
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use core::fmt;
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use format::{parse, ParseResult, Parsed, StrftimeItems};
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use naive::{NaiveDate, NaiveDateTime, NaiveTime};
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use Weekday;
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use {Date, DateTime};
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/// The conversion result from the local time to the timezone-aware datetime types.
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#[derive(Clone, PartialEq, Debug, Copy, Eq, Hash)]
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pub enum LocalResult<T> {
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/// Given local time representation is invalid.
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/// This can occur when, for example, the positive timezone transition.
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None,
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/// Given local time representation has a single unique result.
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Single(T),
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/// Given local time representation has multiple results and thus ambiguous.
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/// This can occur when, for example, the negative timezone transition.
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Ambiguous(T /*min*/, T /*max*/),
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}
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impl<T> LocalResult<T> {
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/// Returns `Some` only when the conversion result is unique, or `None` otherwise.
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pub fn single(self) -> Option<T> {
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match self {
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LocalResult::Single(t) => Some(t),
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_ => None,
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}
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}
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/// Returns `Some` for the earliest possible conversion result, or `None` if none.
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pub fn earliest(self) -> Option<T> {
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match self {
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LocalResult::Single(t) | LocalResult::Ambiguous(t, _) => Some(t),
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_ => None,
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}
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}
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/// Returns `Some` for the latest possible conversion result, or `None` if none.
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pub fn latest(self) -> Option<T> {
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match self {
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LocalResult::Single(t) | LocalResult::Ambiguous(_, t) => Some(t),
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_ => None,
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}
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}
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/// Maps a `LocalResult<T>` into `LocalResult<U>` with given function.
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pub fn map<U, F: FnMut(T) -> U>(self, mut f: F) -> LocalResult<U> {
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match self {
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LocalResult::None => LocalResult::None,
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LocalResult::Single(v) => LocalResult::Single(f(v)),
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LocalResult::Ambiguous(min, max) => LocalResult::Ambiguous(f(min), f(max)),
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}
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}
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}
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impl<Tz: TimeZone> LocalResult<Date<Tz>> {
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/// Makes a new `DateTime` from the current date and given `NaiveTime`.
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/// The offset in the current date is preserved.
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///
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/// Propagates any error. Ambiguous result would be discarded.
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#[inline]
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pub fn and_time(self, time: NaiveTime) -> LocalResult<DateTime<Tz>> {
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match self {
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LocalResult::Single(d) => d
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.and_time(time)
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.map_or(LocalResult::None, LocalResult::Single),
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_ => LocalResult::None,
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}
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}
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/// Makes a new `DateTime` from the current date, hour, minute and second.
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/// The offset in the current date is preserved.
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///
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/// Propagates any error. Ambiguous result would be discarded.
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#[inline]
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pub fn and_hms_opt(self, hour: u32, min: u32, sec: u32) -> LocalResult<DateTime<Tz>> {
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match self {
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LocalResult::Single(d) => d
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.and_hms_opt(hour, min, sec)
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.map_or(LocalResult::None, LocalResult::Single),
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_ => LocalResult::None,
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}
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}
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/// Makes a new `DateTime` from the current date, hour, minute, second and millisecond.
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/// The millisecond part can exceed 1,000 in order to represent the leap second.
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/// The offset in the current date is preserved.
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///
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/// Propagates any error. Ambiguous result would be discarded.
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#[inline]
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pub fn and_hms_milli_opt(
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self,
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hour: u32,
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min: u32,
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sec: u32,
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milli: u32,
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) -> LocalResult<DateTime<Tz>> {
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match self {
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LocalResult::Single(d) => d
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.and_hms_milli_opt(hour, min, sec, milli)
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.map_or(LocalResult::None, LocalResult::Single),
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_ => LocalResult::None,
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}
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}
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/// Makes a new `DateTime` from the current date, hour, minute, second and microsecond.
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/// The microsecond part can exceed 1,000,000 in order to represent the leap second.
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/// The offset in the current date is preserved.
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///
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/// Propagates any error. Ambiguous result would be discarded.
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#[inline]
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pub fn and_hms_micro_opt(
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self,
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hour: u32,
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min: u32,
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sec: u32,
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micro: u32,
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) -> LocalResult<DateTime<Tz>> {
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match self {
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LocalResult::Single(d) => d
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.and_hms_micro_opt(hour, min, sec, micro)
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.map_or(LocalResult::None, LocalResult::Single),
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_ => LocalResult::None,
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}
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}
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/// Makes a new `DateTime` from the current date, hour, minute, second and nanosecond.
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/// The nanosecond part can exceed 1,000,000,000 in order to represent the leap second.
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/// The offset in the current date is preserved.
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///
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/// Propagates any error. Ambiguous result would be discarded.
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#[inline]
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pub fn and_hms_nano_opt(
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self,
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hour: u32,
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min: u32,
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sec: u32,
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nano: u32,
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) -> LocalResult<DateTime<Tz>> {
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match self {
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LocalResult::Single(d) => d
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.and_hms_nano_opt(hour, min, sec, nano)
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.map_or(LocalResult::None, LocalResult::Single),
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_ => LocalResult::None,
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}
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}
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}
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impl<T: fmt::Debug> LocalResult<T> {
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/// Returns the single unique conversion result, or panics accordingly.
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pub fn unwrap(self) -> T {
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match self {
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LocalResult::None => panic!("No such local time"),
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LocalResult::Single(t) => t,
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LocalResult::Ambiguous(t1, t2) => {
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panic!("Ambiguous local time, ranging from {:?} to {:?}", t1, t2)
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}
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}
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}
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}
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/// The offset from the local time to UTC.
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pub trait Offset: Sized + Clone + fmt::Debug {
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/// Returns the fixed offset from UTC to the local time stored.
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fn fix(&self) -> FixedOffset;
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}
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/// The time zone.
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///
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/// The methods here are the primarily constructors for [`Date`](../struct.Date.html) and
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/// [`DateTime`](../struct.DateTime.html) types.
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pub trait TimeZone: Sized + Clone {
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/// An associated offset type.
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/// This type is used to store the actual offset in date and time types.
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/// The original `TimeZone` value can be recovered via `TimeZone::from_offset`.
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type Offset: Offset;
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/// Makes a new `Date` from year, month, day and the current time zone.
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/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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///
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/// The time zone normally does not affect the date (unless it is between UTC-24 and UTC+24),
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/// but it will propagate to the `DateTime` values constructed via this date.
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///
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/// Panics on the out-of-range date, invalid month and/or day.
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///
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/// # Example
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///
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/// ~~~~
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/// use chrono::{Utc, TimeZone};
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///
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/// assert_eq!(Utc.ymd(2015, 5, 15).to_string(), "2015-05-15UTC");
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/// ~~~~
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fn ymd(&self, year: i32, month: u32, day: u32) -> Date<Self> {
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self.ymd_opt(year, month, day).unwrap()
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}
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/// Makes a new `Date` from year, month, day and the current time zone.
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/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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///
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/// The time zone normally does not affect the date (unless it is between UTC-24 and UTC+24),
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/// but it will propagate to the `DateTime` values constructed via this date.
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///
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/// Returns `None` on the out-of-range date, invalid month and/or day.
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///
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/// # Example
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///
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/// ~~~~
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/// use chrono::{Utc, LocalResult, TimeZone};
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///
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/// assert_eq!(Utc.ymd_opt(2015, 5, 15).unwrap().to_string(), "2015-05-15UTC");
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/// assert_eq!(Utc.ymd_opt(2000, 0, 0), LocalResult::None);
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/// ~~~~
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fn ymd_opt(&self, year: i32, month: u32, day: u32) -> LocalResult<Date<Self>> {
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match NaiveDate::from_ymd_opt(year, month, day) {
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Some(d) => self.from_local_date(&d),
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None => LocalResult::None,
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}
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}
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/// Makes a new `Date` from year, day of year (DOY or "ordinal") and the current time zone.
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/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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///
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/// The time zone normally does not affect the date (unless it is between UTC-24 and UTC+24),
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/// but it will propagate to the `DateTime` values constructed via this date.
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///
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/// Panics on the out-of-range date and/or invalid DOY.
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///
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/// # Example
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///
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/// ~~~~
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/// use chrono::{Utc, TimeZone};
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///
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/// assert_eq!(Utc.yo(2015, 135).to_string(), "2015-05-15UTC");
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/// ~~~~
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fn yo(&self, year: i32, ordinal: u32) -> Date<Self> {
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self.yo_opt(year, ordinal).unwrap()
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}
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/// Makes a new `Date` from year, day of year (DOY or "ordinal") and the current time zone.
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/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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///
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/// The time zone normally does not affect the date (unless it is between UTC-24 and UTC+24),
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/// but it will propagate to the `DateTime` values constructed via this date.
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///
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/// Returns `None` on the out-of-range date and/or invalid DOY.
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fn yo_opt(&self, year: i32, ordinal: u32) -> LocalResult<Date<Self>> {
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match NaiveDate::from_yo_opt(year, ordinal) {
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Some(d) => self.from_local_date(&d),
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None => LocalResult::None,
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}
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}
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/// Makes a new `Date` from ISO week date (year and week number), day of the week (DOW) and
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/// the current time zone.
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/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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/// The resulting `Date` may have a different year from the input year.
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///
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/// The time zone normally does not affect the date (unless it is between UTC-24 and UTC+24),
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/// but it will propagate to the `DateTime` values constructed via this date.
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///
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/// Panics on the out-of-range date and/or invalid week number.
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///
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/// # Example
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///
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/// ~~~~
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/// use chrono::{Utc, Weekday, TimeZone};
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///
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/// assert_eq!(Utc.isoywd(2015, 20, Weekday::Fri).to_string(), "2015-05-15UTC");
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/// ~~~~
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fn isoywd(&self, year: i32, week: u32, weekday: Weekday) -> Date<Self> {
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self.isoywd_opt(year, week, weekday).unwrap()
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}
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/// Makes a new `Date` from ISO week date (year and week number), day of the week (DOW) and
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/// the current time zone.
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/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
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/// The resulting `Date` may have a different year from the input year.
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///
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/// The time zone normally does not affect the date (unless it is between UTC-24 and UTC+24),
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/// but it will propagate to the `DateTime` values constructed via this date.
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///
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/// Returns `None` on the out-of-range date and/or invalid week number.
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fn isoywd_opt(&self, year: i32, week: u32, weekday: Weekday) -> LocalResult<Date<Self>> {
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match NaiveDate::from_isoywd_opt(year, week, weekday) {
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Some(d) => self.from_local_date(&d),
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None => LocalResult::None,
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}
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}
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/// Makes a new `DateTime` from the number of non-leap seconds
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/// since January 1, 1970 0:00:00 UTC (aka "UNIX timestamp")
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/// and the number of nanoseconds since the last whole non-leap second.
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///
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/// Panics on the out-of-range number of seconds and/or invalid nanosecond,
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/// for a non-panicking version see [`timestamp_opt`](#method.timestamp_opt).
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///
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/// # Example
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///
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/// ~~~~
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/// use chrono::{Utc, TimeZone};
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///
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/// assert_eq!(Utc.timestamp(1431648000, 0).to_string(), "2015-05-15 00:00:00 UTC");
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/// ~~~~
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fn timestamp(&self, secs: i64, nsecs: u32) -> DateTime<Self> {
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self.timestamp_opt(secs, nsecs).unwrap()
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}
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/// Makes a new `DateTime` from the number of non-leap seconds
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/// since January 1, 1970 0:00:00 UTC (aka "UNIX timestamp")
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/// and the number of nanoseconds since the last whole non-leap second.
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///
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/// Returns `LocalResult::None` on out-of-range number of seconds and/or
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/// invalid nanosecond, otherwise always returns `LocalResult::Single`.
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fn timestamp_opt(&self, secs: i64, nsecs: u32) -> LocalResult<DateTime<Self>> {
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match NaiveDateTime::from_timestamp_opt(secs, nsecs) {
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Some(dt) => LocalResult::Single(self.from_utc_datetime(&dt)),
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None => LocalResult::None,
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}
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}
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/// Makes a new `DateTime` from the number of non-leap milliseconds
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/// since January 1, 1970 0:00:00 UTC (aka "UNIX timestamp").
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///
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/// Panics on out-of-range number of milliseconds for a non-panicking
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/// version see [`timestamp_millis_opt`](#method.timestamp_millis_opt).
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///
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/// # Example
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///
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/// ~~~~
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/// use chrono::{Utc, TimeZone};
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///
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/// assert_eq!(Utc.timestamp_millis(1431648000).timestamp(), 1431648);
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/// ~~~~
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fn timestamp_millis(&self, millis: i64) -> DateTime<Self> {
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self.timestamp_millis_opt(millis).unwrap()
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}
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/// Makes a new `DateTime` from the number of non-leap milliseconds
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/// since January 1, 1970 0:00:00 UTC (aka "UNIX timestamp").
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///
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///
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/// Returns `LocalResult::None` on out-of-range number of milliseconds
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/// and/or invalid nanosecond, otherwise always returns
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/// `LocalResult::Single`.
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///
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/// # Example
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///
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/// ~~~~
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/// use chrono::{Utc, TimeZone, LocalResult};
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/// match Utc.timestamp_millis_opt(1431648000) {
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/// LocalResult::Single(dt) => assert_eq!(dt.timestamp(), 1431648),
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/// _ => panic!("Incorrect timestamp_millis"),
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/// };
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/// ~~~~
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fn timestamp_millis_opt(&self, millis: i64) -> LocalResult<DateTime<Self>> {
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let (mut secs, mut millis) = (millis / 1000, millis % 1000);
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if millis < 0 {
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secs -= 1;
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millis += 1000;
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}
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self.timestamp_opt(secs, millis as u32 * 1_000_000)
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}
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/// Makes a new `DateTime` from the number of non-leap nanoseconds
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/// since January 1, 1970 0:00:00 UTC (aka "UNIX timestamp").
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///
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/// Unlike [`timestamp_millis`](#method.timestamp_millis), this never
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/// panics.
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///
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/// # Example
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///
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/// ~~~~
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/// use chrono::{Utc, TimeZone};
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///
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/// assert_eq!(Utc.timestamp_nanos(1431648000000000).timestamp(), 1431648);
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/// ~~~~
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fn timestamp_nanos(&self, nanos: i64) -> DateTime<Self> {
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let (mut secs, mut nanos) = (nanos / 1_000_000_000, nanos % 1_000_000_000);
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if nanos < 0 {
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secs -= 1;
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nanos += 1_000_000_000;
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}
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self.timestamp_opt(secs, nanos as u32).unwrap()
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}
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/// Parses a string with the specified format string and
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/// returns a `DateTime` with the current offset.
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/// See the [`format::strftime` module](../format/strftime/index.html)
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/// on the supported escape sequences.
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///
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/// If the format does not include offsets, the current offset is assumed;
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/// otherwise the input should have a matching UTC offset.
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///
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/// See also `DateTime::parse_from_str` which gives a local `DateTime`
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/// with parsed `FixedOffset`.
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fn datetime_from_str(&self, s: &str, fmt: &str) -> ParseResult<DateTime<Self>> {
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let mut parsed = Parsed::new();
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parse(&mut parsed, s, StrftimeItems::new(fmt))?;
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parsed.to_datetime_with_timezone(self)
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}
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/// Reconstructs the time zone from the offset.
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fn from_offset(offset: &Self::Offset) -> Self;
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/// Creates the offset(s) for given local `NaiveDate` if possible.
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fn offset_from_local_date(&self, local: &NaiveDate) -> LocalResult<Self::Offset>;
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/// Creates the offset(s) for given local `NaiveDateTime` if possible.
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fn offset_from_local_datetime(&self, local: &NaiveDateTime) -> LocalResult<Self::Offset>;
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/// Converts the local `NaiveDate` to the timezone-aware `Date` if possible.
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fn from_local_date(&self, local: &NaiveDate) -> LocalResult<Date<Self>> {
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self.offset_from_local_date(local).map(|offset| {
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// since FixedOffset is within +/- 1 day, the date is never affected
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Date::from_utc(*local, offset)
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})
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}
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/// Converts the local `NaiveDateTime` to the timezone-aware `DateTime` if possible.
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fn from_local_datetime(&self, local: &NaiveDateTime) -> LocalResult<DateTime<Self>> {
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self.offset_from_local_datetime(local)
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.map(|offset| DateTime::from_utc(*local - offset.fix(), offset))
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}
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/// Creates the offset for given UTC `NaiveDate`. This cannot fail.
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fn offset_from_utc_date(&self, utc: &NaiveDate) -> Self::Offset;
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/// Creates the offset for given UTC `NaiveDateTime`. This cannot fail.
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fn offset_from_utc_datetime(&self, utc: &NaiveDateTime) -> Self::Offset;
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/// Converts the UTC `NaiveDate` to the local time.
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/// The UTC is continuous and thus this cannot fail (but can give the duplicate local time).
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fn from_utc_date(&self, utc: &NaiveDate) -> Date<Self> {
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Date::from_utc(*utc, self.offset_from_utc_date(utc))
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|
}
|
|
|
|
/// Converts the UTC `NaiveDateTime` to the local time.
|
|
/// The UTC is continuous and thus this cannot fail (but can give the duplicate local time).
|
|
fn from_utc_datetime(&self, utc: &NaiveDateTime) -> DateTime<Self> {
|
|
DateTime::from_utc(*utc, self.offset_from_utc_datetime(utc))
|
|
}
|
|
}
|
|
|
|
mod fixed;
|
|
#[cfg(feature = "clock")]
|
|
mod local;
|
|
mod utc;
|
|
|
|
pub use self::fixed::FixedOffset;
|
|
#[cfg(feature = "clock")]
|
|
pub use self::local::Local;
|
|
pub use self::utc::Utc;
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn test_negative_millis() {
|
|
let dt = Utc.timestamp_millis(-1000);
|
|
assert_eq!(dt.to_string(), "1969-12-31 23:59:59 UTC");
|
|
let dt = Utc.timestamp_millis(-7000);
|
|
assert_eq!(dt.to_string(), "1969-12-31 23:59:53 UTC");
|
|
let dt = Utc.timestamp_millis(-7001);
|
|
assert_eq!(dt.to_string(), "1969-12-31 23:59:52.999 UTC");
|
|
let dt = Utc.timestamp_millis(-7003);
|
|
assert_eq!(dt.to_string(), "1969-12-31 23:59:52.997 UTC");
|
|
let dt = Utc.timestamp_millis(-999);
|
|
assert_eq!(dt.to_string(), "1969-12-31 23:59:59.001 UTC");
|
|
let dt = Utc.timestamp_millis(-1);
|
|
assert_eq!(dt.to_string(), "1969-12-31 23:59:59.999 UTC");
|
|
let dt = Utc.timestamp_millis(-60000);
|
|
assert_eq!(dt.to_string(), "1969-12-31 23:59:00 UTC");
|
|
let dt = Utc.timestamp_millis(-3600000);
|
|
assert_eq!(dt.to_string(), "1969-12-31 23:00:00 UTC");
|
|
|
|
for (millis, expected) in &[
|
|
(-7000, "1969-12-31 23:59:53 UTC"),
|
|
(-7001, "1969-12-31 23:59:52.999 UTC"),
|
|
(-7003, "1969-12-31 23:59:52.997 UTC"),
|
|
] {
|
|
match Utc.timestamp_millis_opt(*millis) {
|
|
LocalResult::Single(dt) => {
|
|
assert_eq!(dt.to_string(), *expected);
|
|
},
|
|
e => panic!("Got {:?} instead of an okay answer", e),
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
#[test]
|
|
fn test_negative_nanos() {
|
|
let dt = Utc.timestamp_nanos(-1_000_000_000);
|
|
assert_eq!(dt.to_string(), "1969-12-31 23:59:59 UTC");
|
|
let dt = Utc.timestamp_nanos(-999_999_999);
|
|
assert_eq!(dt.to_string(), "1969-12-31 23:59:59.000000001 UTC");
|
|
let dt = Utc.timestamp_nanos(-1);
|
|
assert_eq!(dt.to_string(), "1969-12-31 23:59:59.999999999 UTC");
|
|
let dt = Utc.timestamp_nanos(-60_000_000_000);
|
|
assert_eq!(dt.to_string(), "1969-12-31 23:59:00 UTC");
|
|
let dt = Utc.timestamp_nanos(-3_600_000_000_000);
|
|
assert_eq!(dt.to_string(), "1969-12-31 23:00:00 UTC");
|
|
}
|
|
|
|
#[test]
|
|
fn test_nanos_never_panics() {
|
|
Utc.timestamp_nanos(i64::max_value());
|
|
Utc.timestamp_nanos(i64::default());
|
|
Utc.timestamp_nanos(i64::min_value());
|
|
}
|
|
}
|