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mod.rs
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// This is a part of Chrono.
// See README.md and LICENSE.txt for details.
//! ISO 8601 date and time with time zone.
#[cfg(all(not(feature = "std"), feature = "alloc"))]
use alloc::string::String;
use core::borrow::Borrow;
use core::cmp::Ordering;
use core::fmt::Write;
use core::ops::{Add, AddAssign, Sub, SubAssign};
use core::time::Duration;
use core::{fmt, hash, str};
#[cfg(feature = "std")]
use std::time::{SystemTime, UNIX_EPOCH};
#[cfg(feature = "unstable-locales")]
use crate::format::Locale;
use crate::format::{
parse, parse_and_remainder, parse_rfc3339, Fixed, Item, ParseError, ParseResult, Parsed,
StrftimeItems, TOO_LONG,
};
#[cfg(any(feature = "alloc", feature = "std"))]
use crate::format::{write_rfc3339, DelayedFormat};
use crate::naive::{Days, IsoWeek, NaiveDate, NaiveDateTime, NaiveTime};
#[cfg(feature = "clock")]
use crate::offset::Local;
use crate::offset::{FixedOffset, Offset, TimeZone, Utc};
#[allow(deprecated)]
use crate::Date;
use crate::{Datelike, Months, TimeDelta, Timelike, Weekday};
#[cfg(feature = "rkyv")]
use rkyv::{Archive, Deserialize, Serialize};
/// documented at re-export site
#[cfg(feature = "serde")]
pub(super) mod serde;
#[cfg(test)]
mod tests;
/// Specific formatting options for seconds. This may be extended in the
/// future, so exhaustive matching in external code is not recommended.
///
/// See the `TimeZone::to_rfc3339_opts` function for usage.
#[non_exhaustive]
#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
#[allow(clippy::manual_non_exhaustive)]
pub enum SecondsFormat {
/// Format whole seconds only, with no decimal point nor subseconds.
Secs,
/// Use fixed 3 subsecond digits. This corresponds to
/// [Fixed::Nanosecond3](format/enum.Fixed.html#variant.Nanosecond3).
Millis,
/// Use fixed 6 subsecond digits. This corresponds to
/// [Fixed::Nanosecond6](format/enum.Fixed.html#variant.Nanosecond6).
Micros,
/// Use fixed 9 subsecond digits. This corresponds to
/// [Fixed::Nanosecond9](format/enum.Fixed.html#variant.Nanosecond9).
Nanos,
/// Automatically select one of `Secs`, `Millis`, `Micros`, or `Nanos` to
/// display all available non-zero sub-second digits. This corresponds to
/// [Fixed::Nanosecond](format/enum.Fixed.html#variant.Nanosecond).
AutoSi,
}
/// ISO 8601 combined date and time with time zone.
///
/// There are some constructors implemented here (the `from_*` methods), but
/// the general-purpose constructors are all via the methods on the
/// [`TimeZone`](./offset/trait.TimeZone.html) implementations.
#[derive(Clone)]
#[cfg_attr(feature = "rkyv", derive(Archive, Deserialize, Serialize))]
pub struct DateTime<Tz: TimeZone> {
datetime: NaiveDateTime,
offset: Tz::Offset,
}
/// The minimum possible `DateTime<Utc>`.
#[deprecated(since = "0.4.20", note = "Use DateTime::MIN_UTC instead")]
pub const MIN_DATETIME: DateTime<Utc> = DateTime::<Utc>::MIN_UTC;
/// The maximum possible `DateTime<Utc>`.
#[deprecated(since = "0.4.20", note = "Use DateTime::MAX_UTC instead")]
pub const MAX_DATETIME: DateTime<Utc> = DateTime::<Utc>::MAX_UTC;
impl<Tz: TimeZone> DateTime<Tz> {
/// Makes a new `DateTime` from its components: a `NaiveDateTime` in UTC and an `Offset`.
///
/// This is a low-level method, intended for use cases such as deserializing a `DateTime` or
/// passing it through FFI.
///
/// For regular use you will probably want to use a method such as
/// [`TimeZone::from_local_datetime`] or [`NaiveDateTime::and_local_timezone`] instead.
///
/// # Example
///
#[cfg_attr(not(feature = "clock"), doc = "```ignore")]
#[cfg_attr(feature = "clock", doc = "```rust")]
/// use chrono::{Local, DateTime};
///
/// let dt = Local::now();
/// // Get components
/// let naive_utc = dt.naive_utc();
/// let offset = dt.offset().clone();
/// // Serialize, pass through FFI... and recreate the `DateTime`:
/// let dt_new = DateTime::<Local>::from_naive_utc_and_offset(naive_utc, offset);
/// assert_eq!(dt, dt_new);
/// ```
#[inline]
#[must_use]
pub fn from_naive_utc_and_offset(datetime: NaiveDateTime, offset: Tz::Offset) -> DateTime<Tz> {
DateTime { datetime, offset }
}
/// Makes a new `DateTime` from its components: a `NaiveDateTime` in UTC and an `Offset`.
#[inline]
#[must_use]
#[deprecated(
since = "0.4.27",
note = "Use TimeZone::from_utc_datetime() or DateTime::from_naive_utc_and_offset instead"
)]
pub fn from_utc(datetime: NaiveDateTime, offset: Tz::Offset) -> DateTime<Tz> {
DateTime { datetime, offset }
}
/// Makes a new `DateTime` from a `NaiveDateTime` in *local* time and an `Offset`.
///
/// # Panics
///
/// Panics if the local datetime can't be converted to UTC because it would be out of range.
///
/// This can happen if `datetime` is near the end of the representable range of `NaiveDateTime`,
/// and the offset from UTC pushes it beyond that.
#[inline]
#[must_use]
#[deprecated(
since = "0.4.27",
note = "Use TimeZone::from_local_datetime() or NaiveDateTime::and_local_timezone instead"
)]
pub fn from_local(datetime: NaiveDateTime, offset: Tz::Offset) -> DateTime<Tz> {
let datetime_utc = datetime - offset.fix();
DateTime { datetime: datetime_utc, offset }
}
/// Retrieves the date component with an associated timezone.
///
/// Unless you are immediately planning on turning this into a `DateTime`
/// with the same timezone you should use the [`date_naive`](DateTime::date_naive) method.
///
/// [`NaiveDate`] is a more well-defined type, and has more traits implemented on it,
/// so should be preferred to [`Date`] any time you truly want to operate on dates.
///
/// # Panics
///
/// [`DateTime`] internally stores the date and time in UTC with a [`NaiveDateTime`]. This
/// method will panic if the offset from UTC would push the local date outside of the
/// representable range of a [`Date`].
#[inline]
#[deprecated(since = "0.4.23", note = "Use `date_naive()` instead")]
#[allow(deprecated)]
#[must_use]
pub fn date(&self) -> Date<Tz> {
Date::from_utc(self.naive_local().date(), self.offset.clone())
}
/// Retrieves the date component.
///
/// # Panics
///
/// [`DateTime`] internally stores the date and time in UTC with a [`NaiveDateTime`]. This
/// method will panic if the offset from UTC would push the local date outside of the
/// representable range of a [`NaiveDate`].
///
/// # Example
///
/// ```
/// use chrono::prelude::*;
///
/// let date: DateTime<Utc> = Utc.with_ymd_and_hms(2020, 1, 1, 0, 0, 0).unwrap();
/// let other: DateTime<FixedOffset> = FixedOffset::east_opt(23).unwrap().with_ymd_and_hms(2020, 1, 1, 0, 0, 0).unwrap();
/// assert_eq!(date.date_naive(), other.date_naive());
/// ```
#[inline]
#[must_use]
pub fn date_naive(&self) -> NaiveDate {
let local = self.naive_local();
NaiveDate::from_ymd_opt(local.year(), local.month(), local.day()).unwrap()
}
/// Retrieves the time component.
#[inline]
#[must_use]
pub fn time(&self) -> NaiveTime {
self.datetime.time() + self.offset.fix()
}
/// Returns the number of non-leap seconds since January 1, 1970 0:00:00 UTC
/// (aka "UNIX timestamp").
///
/// The reverse operation of creating a [`DateTime`] from a timestamp can be performed
/// using [`from_timestamp_opt`](#method.from_timestamp_opt) or [`TimeZone::timestamp_opt`].
///
/// ```
/// use chrono::{DateTime, TimeZone, Utc};
///
/// let dt: DateTime<Utc> = Utc.with_ymd_and_hms(2015, 5, 15, 0, 0, 0).unwrap();
/// assert_eq!(dt.timestamp(), 1431648000);
///
/// assert_eq!(DateTime::from_timestamp_opt(dt.timestamp(), dt.subsec_nanos()).unwrap(), dt);
/// ```
#[inline]
#[must_use]
pub fn timestamp(&self) -> i64 {
self.datetime.timestamp()
}
/// Returns the number of non-leap-milliseconds since January 1, 1970 UTC.
///
/// # Example
///
/// ```
/// use chrono::{Utc, NaiveDate};
///
/// let dt = NaiveDate::from_ymd_opt(1970, 1, 1).unwrap().and_hms_milli_opt(0, 0, 1, 444).unwrap().and_local_timezone(Utc).unwrap();
/// assert_eq!(dt.timestamp_millis(), 1_444);
///
/// let dt = NaiveDate::from_ymd_opt(2001, 9, 9).unwrap().and_hms_milli_opt(1, 46, 40, 555).unwrap().and_local_timezone(Utc).unwrap();
/// assert_eq!(dt.timestamp_millis(), 1_000_000_000_555);
/// ```
#[inline]
#[must_use]
pub fn timestamp_millis(&self) -> i64 {
self.datetime.timestamp_millis()
}
/// Returns the number of non-leap-microseconds since January 1, 1970 UTC.
///
/// # Example
///
/// ```
/// use chrono::{Utc, NaiveDate};
///
/// let dt = NaiveDate::from_ymd_opt(1970, 1, 1).unwrap().and_hms_micro_opt(0, 0, 1, 444).unwrap().and_local_timezone(Utc).unwrap();
/// assert_eq!(dt.timestamp_micros(), 1_000_444);
///
/// let dt = NaiveDate::from_ymd_opt(2001, 9, 9).unwrap().and_hms_micro_opt(1, 46, 40, 555).unwrap().and_local_timezone(Utc).unwrap();
/// assert_eq!(dt.timestamp_micros(), 1_000_000_000_000_555);
/// ```
#[inline]
#[must_use]
pub fn timestamp_micros(&self) -> i64 {
self.datetime.timestamp_micros()
}
/// Returns the number of non-leap-nanoseconds since January 1, 1970 UTC.
///
/// # Panics
///
/// An `i64` with nanosecond precision can span a range of ~584 years. This function panics on
/// an out of range `DateTime`.
///
/// The dates that can be represented as nanoseconds are between 1677-09-21T00:12:44.0 and
/// 2262-04-11T23:47:16.854775804.
///
/// # Example
///
/// ```
/// use chrono::{Utc, NaiveDate};
///
/// let dt = NaiveDate::from_ymd_opt(1970, 1, 1).unwrap().and_hms_nano_opt(0, 0, 1, 444).unwrap().and_local_timezone(Utc).unwrap();
/// assert_eq!(dt.timestamp_nanos(), 1_000_000_444);
///
/// let dt = NaiveDate::from_ymd_opt(2001, 9, 9).unwrap().and_hms_nano_opt(1, 46, 40, 555).unwrap().and_local_timezone(Utc).unwrap();
/// assert_eq!(dt.timestamp_nanos(), 1_000_000_000_000_000_555);
/// ```
#[inline]
#[must_use]
pub fn timestamp_nanos(&self) -> i64 {
self.datetime.timestamp_nanos()
}
/// Returns the number of milliseconds since the last second boundary.
///
/// In event of a leap second this may exceed 999.
#[inline]
#[must_use]
pub fn timestamp_subsec_millis(&self) -> u32 {
self.datetime.timestamp_subsec_millis()
}
/// Returns the number of microseconds since the last second boundary.
///
/// In event of a leap second this may exceed 999,999.
#[inline]
#[must_use]
pub fn timestamp_subsec_micros(&self) -> u32 {
self.datetime.timestamp_subsec_micros()
}
/// Returns the number of nanoseconds since the last second boundary
///
/// In event of a leap second this may exceed 999,999,999.
#[inline]
#[must_use]
pub fn timestamp_subsec_nanos(&self) -> u32 {
self.datetime.timestamp_subsec_nanos()
}
/// Retrieves an associated offset from UTC.
#[inline]
#[must_use]
pub fn offset(&self) -> &Tz::Offset {
&self.offset
}
/// Retrieves an associated time zone.
#[inline]
#[must_use]
pub fn timezone(&self) -> Tz {
TimeZone::from_offset(&self.offset)
}
/// Changes the associated time zone.
/// The returned `DateTime` references the same instant of time from the perspective of the
/// provided time zone.
#[inline]
#[must_use]
pub fn with_timezone<Tz2: TimeZone>(&self, tz: &Tz2) -> DateTime<Tz2> {
tz.from_utc_datetime(&self.datetime)
}
/// Fix the offset from UTC to its current value, dropping the associated timezone information.
/// This it useful for converting a generic `DateTime<Tz: Timezone>` to `DateTime<FixedOffset>`.
#[inline]
#[must_use]
pub fn fixed_offset(&self) -> DateTime<FixedOffset> {
self.with_timezone(&self.offset().fix())
}
/// Adds given `Duration` to the current date and time.
///
/// # Errors
///
/// Returns `None` if the resulting date would be out of range.
#[inline]
#[must_use]
pub fn checked_add_signed(self, rhs: TimeDelta) -> Option<DateTime<Tz>> {
let datetime = self.datetime.checked_add_signed(rhs)?;
let tz = self.timezone();
Some(tz.from_utc_datetime(&datetime))
}
/// Adds given `Months` to the current date and time.
///
/// Uses the last day of the month if the day does not exist in the resulting month.
///
/// See [`NaiveDate::checked_add_months`] for more details on behavior.
///
/// # Errors
///
/// Returns `None` if:
/// - The resulting date would be out of range.
/// - The local time at the resulting date does not exist or is ambiguous, for example during a
/// daylight saving time transition.
#[must_use]
pub fn checked_add_months(self, rhs: Months) -> Option<DateTime<Tz>> {
self.naive_local()
.checked_add_months(rhs)?
.and_local_timezone(Tz::from_offset(&self.offset))
.single()
}
/// Subtracts given `Duration` from the current date and time.
///
/// # Errors
///
/// Returns `None` if the resulting date would be out of range.
#[inline]
#[must_use]
pub fn checked_sub_signed(self, rhs: TimeDelta) -> Option<DateTime<Tz>> {
let datetime = self.datetime.checked_sub_signed(rhs)?;
let tz = self.timezone();
Some(tz.from_utc_datetime(&datetime))
}
/// Subtracts given `Months` from the current date and time.
///
/// Uses the last day of the month if the day does not exist in the resulting month.
///
/// See [`NaiveDate::checked_sub_months`] for more details on behavior.
///
/// # Errors
///
/// Returns `None` if:
/// - The resulting date would be out of range.
/// - The local time at the resulting date does not exist or is ambiguous, for example during a
/// daylight saving time transition.
#[must_use]
pub fn checked_sub_months(self, rhs: Months) -> Option<DateTime<Tz>> {
self.naive_local()
.checked_sub_months(rhs)?
.and_local_timezone(Tz::from_offset(&self.offset))
.single()
}
/// Add a duration in [`Days`] to the date part of the `DateTime`.
///
/// # Errors
///
/// Returns `None` if:
/// - The resulting date would be out of range.
/// - The local time at the resulting date does not exist or is ambiguous, for example during a
/// daylight saving time transition.
#[must_use]
pub fn checked_add_days(self, days: Days) -> Option<Self> {
self.naive_local()
.checked_add_days(days)?
.and_local_timezone(TimeZone::from_offset(&self.offset))
.single()
}
/// Subtract a duration in [`Days`] from the date part of the `DateTime`.
///
/// # Errors
///
/// Returns `None` if:
/// - The resulting date would be out of range.
/// - The local time at the resulting date does not exist or is ambiguous, for example during a
/// daylight saving time transition.
#[must_use]
pub fn checked_sub_days(self, days: Days) -> Option<Self> {
self.naive_local()
.checked_sub_days(days)?
.and_local_timezone(TimeZone::from_offset(&self.offset))
.single()
}
/// Subtracts another `DateTime` from the current date and time.
/// This does not overflow or underflow at all.
#[inline]
#[must_use]
pub fn signed_duration_since<Tz2: TimeZone>(
self,
rhs: impl Borrow<DateTime<Tz2>>,
) -> TimeDelta {
self.datetime.signed_duration_since(rhs.borrow().datetime)
}
/// Returns a view to the naive UTC datetime.
#[inline]
#[must_use]
pub fn naive_utc(&self) -> NaiveDateTime {
self.datetime
}
/// Returns a view to the naive local datetime.
///
/// # Panics
///
/// [`DateTime`] internally stores the date and time in UTC with a [`NaiveDateTime`]. This
/// method will panic if the offset from UTC would push the local datetime outside of the
/// representable range of a [`NaiveDateTime`].
#[inline]
#[must_use]
pub fn naive_local(&self) -> NaiveDateTime {
self.datetime + self.offset.fix()
}
/// Retrieve the elapsed years from now to the given [`DateTime`].
///
/// # Errors
///
/// Returns `None` if `base < self`.
#[must_use]
pub fn years_since(&self, base: Self) -> Option<u32> {
let mut years = self.year() - base.year();
let earlier_time =
(self.month(), self.day(), self.time()) < (base.month(), base.day(), base.time());
years -= match earlier_time {
true => 1,
false => 0,
};
match years >= 0 {
true => Some(years as u32),
false => None,
}
}
/// Returns an RFC 2822 date and time string such as `Tue, 1 Jul 2003 10:52:37 +0200`.
///
/// # Panics
///
/// Panics if the date can not be represented in this format: the year may not be negative and
/// can not have more than 4 digits.
#[cfg(any(feature = "alloc", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
#[must_use]
pub fn to_rfc2822(&self) -> String {
let mut result = String::with_capacity(32);
crate::format::write_rfc2822(&mut result, self.naive_local(), self.offset.fix())
.expect("writing rfc2822 datetime to string should never fail");
result
}
/// Returns an RFC 3339 and ISO 8601 date and time string such as `1996-12-19T16:39:57-08:00`.
#[cfg(any(feature = "alloc", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
#[must_use]
pub fn to_rfc3339(&self) -> String {
// For some reason a string with a capacity less than 32 is ca 20% slower when benchmarking.
let mut result = String::with_capacity(32);
let naive = self.naive_local();
let offset = self.offset.fix();
write_rfc3339(&mut result, naive, offset, SecondsFormat::AutoSi, false)
.expect("writing rfc3339 datetime to string should never fail");
result
}
/// Return an RFC 3339 and ISO 8601 date and time string with subseconds
/// formatted as per `SecondsFormat`.
///
/// If `use_z` is true and the timezone is UTC (offset 0), uses `Z` as
/// per [`Fixed::TimezoneOffsetColonZ`]. If `use_z` is false, uses
/// [`Fixed::TimezoneOffsetColon`]
///
/// # Examples
///
/// ```rust
/// # use chrono::{FixedOffset, SecondsFormat, TimeZone, Utc, NaiveDate};
/// let dt = NaiveDate::from_ymd_opt(2018, 1, 26).unwrap().and_hms_micro_opt(18, 30, 9, 453_829).unwrap().and_local_timezone(Utc).unwrap();
/// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Millis, false),
/// "2018-01-26T18:30:09.453+00:00");
/// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Millis, true),
/// "2018-01-26T18:30:09.453Z");
/// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Secs, true),
/// "2018-01-26T18:30:09Z");
///
/// let pst = FixedOffset::east_opt(8 * 60 * 60).unwrap();
/// let dt = pst.from_local_datetime(&NaiveDate::from_ymd_opt(2018, 1, 26).unwrap().and_hms_micro_opt(10, 30, 9, 453_829).unwrap()).unwrap();
/// assert_eq!(dt.to_rfc3339_opts(SecondsFormat::Secs, true),
/// "2018-01-26T10:30:09+08:00");
/// ```
#[cfg(any(feature = "alloc", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
#[must_use]
pub fn to_rfc3339_opts(&self, secform: SecondsFormat, use_z: bool) -> String {
let mut result = String::with_capacity(38);
write_rfc3339(&mut result, self.naive_local(), self.offset.fix(), secform, use_z)
.expect("writing rfc3339 datetime to string should never fail");
result
}
/// The minimum possible `DateTime<Utc>`.
pub const MIN_UTC: DateTime<Utc> = DateTime { datetime: NaiveDateTime::MIN, offset: Utc };
/// The maximum possible `DateTime<Utc>`.
pub const MAX_UTC: DateTime<Utc> = DateTime { datetime: NaiveDateTime::MAX, offset: Utc };
}
impl DateTime<Utc> {
/// Makes a new [`DateTime<Utc>`] from the number of non-leap seconds
/// since January 1, 1970 0:00:00 UTC (aka "UNIX timestamp")
/// and the number of nanoseconds since the last whole non-leap second.
///
/// This is guaranteed to round-trip with regard to [`timestamp`](#method.timestamp) and
/// [`timestamp_subsec_nanos`](#method.timestamp).
///
/// Returns `None` on out-of-range number of seconds and/or
/// invalid nanosecond, otherwise returns `Some(DateTime {...})`.
///
/// If you need to create a `DateTime` with some other [`TimeZone`], use [`TimeZone::timestamp_opt`]
/// or [`DateTime::with_timezone`].
///
/// # Example
///
/// ```
/// use chrono::{DateTime, Utc};
///
/// let dt: DateTime<Utc> = DateTime::<Utc>::from_timestamp_opt(1431648000, 0).expect("invalid timestamp");
///
/// assert_eq!(dt.to_string(), "2015-05-15 00:00:00 UTC");
/// assert_eq!(DateTime::from_timestamp_opt(dt.timestamp(), dt.timestamp_subsec_nanos()).unwrap(), dt);
/// ```
#[inline]
#[must_use]
pub fn from_timestamp_opt(secs: i64, nsecs: u32) -> Option<Self> {
NaiveDateTime::from_timestamp_opt(secs, nsecs)
.map(|ndt| DateTime::from_naive_utc_and_offset(ndt, Utc))
}
}
impl Default for DateTime<Utc> {
fn default() -> Self {
Utc.from_utc_datetime(&NaiveDateTime::default())
}
}
#[cfg(feature = "clock")]
#[cfg_attr(docsrs, doc(cfg(feature = "clock")))]
impl Default for DateTime<Local> {
fn default() -> Self {
Local.from_utc_datetime(&NaiveDateTime::default())
}
}
impl Default for DateTime<FixedOffset> {
fn default() -> Self {
FixedOffset::west_opt(0).unwrap().from_utc_datetime(&NaiveDateTime::default())
}
}
/// Convert a `DateTime<Utc>` instance into a `DateTime<FixedOffset>` instance.
impl From<DateTime<Utc>> for DateTime<FixedOffset> {
/// Convert this `DateTime<Utc>` instance into a `DateTime<FixedOffset>` instance.
///
/// Conversion is done via [`DateTime::with_timezone`]. Note that the converted value returned by
/// this will be created with a fixed timezone offset of 0.
fn from(src: DateTime<Utc>) -> Self {
src.with_timezone(&FixedOffset::east_opt(0).unwrap())
}
}
/// Convert a `DateTime<Utc>` instance into a `DateTime<Local>` instance.
#[cfg(feature = "clock")]
#[cfg_attr(docsrs, doc(cfg(feature = "clock")))]
impl From<DateTime<Utc>> for DateTime<Local> {
/// Convert this `DateTime<Utc>` instance into a `DateTime<Local>` instance.
///
/// Conversion is performed via [`DateTime::with_timezone`], accounting for the difference in timezones.
fn from(src: DateTime<Utc>) -> Self {
src.with_timezone(&Local)
}
}
/// Convert a `DateTime<FixedOffset>` instance into a `DateTime<Utc>` instance.
impl From<DateTime<FixedOffset>> for DateTime<Utc> {
/// Convert this `DateTime<FixedOffset>` instance into a `DateTime<Utc>` instance.
///
/// Conversion is performed via [`DateTime::with_timezone`], accounting for the timezone
/// difference.
fn from(src: DateTime<FixedOffset>) -> Self {
src.with_timezone(&Utc)
}
}
/// Convert a `DateTime<FixedOffset>` instance into a `DateTime<Local>` instance.
#[cfg(feature = "clock")]
#[cfg_attr(docsrs, doc(cfg(feature = "clock")))]
impl From<DateTime<FixedOffset>> for DateTime<Local> {
/// Convert this `DateTime<FixedOffset>` instance into a `DateTime<Local>` instance.
///
/// Conversion is performed via [`DateTime::with_timezone`]. Returns the equivalent value in local
/// time.
fn from(src: DateTime<FixedOffset>) -> Self {
src.with_timezone(&Local)
}
}
/// Convert a `DateTime<Local>` instance into a `DateTime<Utc>` instance.
#[cfg(feature = "clock")]
#[cfg_attr(docsrs, doc(cfg(feature = "clock")))]
impl From<DateTime<Local>> for DateTime<Utc> {
/// Convert this `DateTime<Local>` instance into a `DateTime<Utc>` instance.
///
/// Conversion is performed via [`DateTime::with_timezone`], accounting for the difference in
/// timezones.
fn from(src: DateTime<Local>) -> Self {
src.with_timezone(&Utc)
}
}
/// Convert a `DateTime<Local>` instance into a `DateTime<FixedOffset>` instance.
#[cfg(feature = "clock")]
#[cfg_attr(docsrs, doc(cfg(feature = "clock")))]
impl From<DateTime<Local>> for DateTime<FixedOffset> {
/// Convert this `DateTime<Local>` instance into a `DateTime<FixedOffset>` instance.
///
/// Conversion is performed via [`DateTime::with_timezone`].
fn from(src: DateTime<Local>) -> Self {
src.with_timezone(&src.offset().fix())
}
}
/// Maps the local datetime to other datetime with given conversion function.
fn map_local<Tz: TimeZone, F>(dt: &DateTime<Tz>, mut f: F) -> Option<DateTime<Tz>>
where
F: FnMut(NaiveDateTime) -> Option<NaiveDateTime>,
{
f(dt.naive_local()).and_then(|datetime| dt.timezone().from_local_datetime(&datetime).single())
}
impl DateTime<FixedOffset> {
/// Parses an RFC 2822 date and time string such as `Tue, 1 Jul 2003 10:52:37 +0200`,
/// then returns a new [`DateTime`] with a parsed [`FixedOffset`].
///
/// This parses valid RFC 2822 datetime strings (such as `Tue, 1 Jul 2003 10:52:37 +0200`)
/// and returns a new [`DateTime`] instance with the parsed timezone as the [`FixedOffset`].
///
/// RFC 2822 is the internet message standard that specifies the representation of times in HTTP
/// and email headers.
///
/// The RFC 2822 standard allows arbitrary intermixed whitespace.
/// See [RFC 2822 Appendix A.5]
///
/// ```
/// # use chrono::{DateTime, FixedOffset, TimeZone};
/// assert_eq!(
/// DateTime::<FixedOffset>::parse_from_rfc2822("Wed, 18 Feb 2015 23:16:09 GMT").unwrap(),
/// FixedOffset::east_opt(0).unwrap().with_ymd_and_hms(2015, 2, 18, 23, 16, 9).unwrap()
/// );
/// ```
///
/// [RFC 2822 Appendix A.5]: https://www.rfc-editor.org/rfc/rfc2822#appendix-A.5
pub fn parse_from_rfc2822(s: &str) -> ParseResult<DateTime<FixedOffset>> {
const ITEMS: &[Item<'static>] = &[Item::Fixed(Fixed::RFC2822)];
let mut parsed = Parsed::new();
parse(&mut parsed, s, ITEMS.iter())?;
parsed.to_datetime()
}
/// Parses an RFC 3339 and ISO 8601 date and time string such as `1996-12-19T16:39:57-08:00`,
/// then returns a new [`DateTime`] with a parsed [`FixedOffset`].
///
/// Parses all valid RFC 3339 values (as well as the subset of valid ISO 8601 values that are
/// also valid RFC 3339 date-and-time values) and returns a new [`DateTime`] with a
/// [`FixedOffset`] corresponding to the parsed timezone. While RFC 3339 values come in a wide
/// variety of shapes and sizes, `1996-12-19T16:39:57-08:00` is an example of the most commonly
/// encountered variety of RFC 3339 formats.
///
/// Why isn't this named `parse_from_iso8601`? That's because ISO 8601 allows representing
/// values in a wide range of formats, only some of which represent actual date-and-time
/// instances (rather than periods, ranges, dates, or times). Some valid ISO 8601 values are
/// also simultaneously valid RFC 3339 values, but not all RFC 3339 values are valid ISO 8601
/// values (or the other way around).
pub fn parse_from_rfc3339(s: &str) -> ParseResult<DateTime<FixedOffset>> {
let mut parsed = Parsed::new();
let (s, _) = parse_rfc3339(&mut parsed, s)?;
if !s.is_empty() {
return Err(TOO_LONG);
}
parsed.to_datetime()
}
/// Parses a string with the specified format string and returns a new
/// [`DateTime`] with a parsed [`FixedOffset`].
///
/// Note that this method *requires a timezone* in the input string. See
/// [`NaiveDateTime::parse_from_str`](./naive/struct.NaiveDateTime.html#method.parse_from_str)
/// for a version that does not require a timezone in the to-be-parsed str. The returned
/// [`DateTime`] value will have a [`FixedOffset`] reflecting the parsed timezone.
///
/// See the [`format::strftime` module](./format/strftime/index.html) for supported format
/// sequences.
///
/// # Example
///
/// ```rust
/// use chrono::{DateTime, FixedOffset, TimeZone, NaiveDate};
///
/// let dt = DateTime::<FixedOffset>::parse_from_str(
/// "1983 Apr 13 12:09:14.274 +0000", "%Y %b %d %H:%M:%S%.3f %z");
/// assert_eq!(dt, Ok(FixedOffset::east_opt(0).unwrap().from_local_datetime(&NaiveDate::from_ymd_opt(1983, 4, 13).unwrap().and_hms_milli_opt(12, 9, 14, 274).unwrap()).unwrap()));
/// ```
pub fn parse_from_str(s: &str, fmt: &str) -> ParseResult<DateTime<FixedOffset>> {
let mut parsed = Parsed::new();
parse(&mut parsed, s, StrftimeItems::new(fmt))?;
parsed.to_datetime()
}
/// Parses a string from a user-specified format into a `DateTime<FixedOffset>` value, and a
/// slice with the remaining portion of the string.
///
/// Note that this method *requires a timezone* in the input string. See
/// [`NaiveDateTime::parse_and_remainder`] for a version that does not
/// require a timezone in `s`. The returned [`DateTime`] value will have a [`FixedOffset`]
/// reflecting the parsed timezone.
///
/// See the [`format::strftime` module](./format/strftime/index.html) for supported format
/// sequences.
///
/// Similar to [`parse_from_str`](#method.parse_from_str).
///
/// # Example
///
/// ```rust
/// # use chrono::{DateTime, FixedOffset, TimeZone};
/// let (datetime, remainder) = DateTime::parse_and_remainder(
/// "2015-02-18 23:16:09 +0200 trailing text", "%Y-%m-%d %H:%M:%S %z").unwrap();
/// assert_eq!(
/// datetime,
/// FixedOffset::east_opt(2*3600).unwrap().with_ymd_and_hms(2015, 2, 18, 23, 16, 9).unwrap()
/// );
/// assert_eq!(remainder, " trailing text");
/// ```
pub fn parse_and_remainder<'a>(
s: &'a str,
fmt: &str,
) -> ParseResult<(DateTime<FixedOffset>, &'a str)> {
let mut parsed = Parsed::new();
let remainder = parse_and_remainder(&mut parsed, s, StrftimeItems::new(fmt))?;
parsed.to_datetime().map(|d| (d, remainder))
}
}
impl DateTime<Utc> {
/// Parses an RFC 2822 date-and-time string into a `DateTime<Utc>` value.
///
/// This parses valid RFC 2822 datetime values (such as `Tue, 1 Jul 2003 10:52:37 +0200`)
/// and returns a new `DateTime<Utc>` instance corresponding to the UTC date/time, accounting
/// for the difference between UTC and the parsed timezone, should they differ.
///
/// RFC 2822 is the internet message standard that specifies the representation of times in HTTP
/// and email headers.
pub fn parse_from_rfc2822(s: &str) -> ParseResult<DateTime<Utc>> {
DateTime::<FixedOffset>::parse_from_rfc2822(s).map(|result| result.into())
}
/// Parses an RFC 3339 date-and-time string into a `DateTime<Utc>` value.
///
/// Parses all valid RFC 3339 values (as well as the subset of valid ISO 8601 values that are
/// also valid RFC 3339 date-and-time values) and returns a new `DateTime<Utc>` instance
/// corresponding to the matching UTC date/time, accounting for the difference between UTC and
/// the parsed input's timezone, should they differ. While RFC 3339 values come in a wide
/// variety of shapes and sizes, `1996-12-19T16:39:57-08:00` is an example of the most commonly
/// encountered variety of RFC 3339 formats.
///
/// Why isn't this named `parse_from_iso8601`? That's because ISO 8601 allows representing
/// values in a wide range of formats, only some of which represent actual date-and-time
/// instances (rather than periods, ranges, dates, or times). Some valid ISO 8601 values are
/// also simultaneously valid RFC 3339 values, but not all RFC 3339 values are valid ISO 8601
/// values (or the other way around).
pub fn parse_from_rfc3339(s: &str) -> ParseResult<DateTime<Utc>> {
DateTime::<FixedOffset>::parse_from_rfc3339(s).map(|result| result.into())
}
/// Parses a string from a user-specified format into a `DateTime<Utc>` value.
///
/// Note that this method *requires a timezone* in the input string. See
/// [`NaiveDateTime::parse_from_str`](./naive/struct.NaiveDateTime.html#method.parse_from_str)
/// for a version that does not require a timezone in the to-be-parsed str. The returned
/// `DateTime<Utc>` value will reflect the difference in timezones between UTC and the parsed
/// time zone, should they differ.
///
/// See the [`format::strftime` module](./format/strftime/index.html) for supported format
/// sequences.
///
/// # Example
///
/// ```rust
/// use chrono::{DateTime, NaiveDate, Utc};
///
/// let dt = DateTime::<Utc>::parse_from_str(
/// "1983 Apr 13 12:09:14.274 +0100", "%Y %b %d %H:%M:%S%.3f %z");
/// assert_eq!(dt, Ok(NaiveDate::from_ymd_opt(1983, 4, 13).unwrap().and_hms_milli_opt(11, 9, 14, 274).unwrap().and_utc()));
/// ```
pub fn parse_from_str(s: &str, fmt: &str) -> ParseResult<DateTime<Utc>> {
DateTime::<FixedOffset>::parse_from_str(s, fmt).map(|result| result.into())
}
}
impl<Tz: TimeZone> DateTime<Tz>
where
Tz::Offset: fmt::Display,
{
/// Formats the combined date and time with the specified formatting items.
#[cfg(any(feature = "alloc", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
#[inline]
#[must_use]
pub fn format_with_items<'a, I, B>(&self, items: I) -> DelayedFormat<I>
where
I: Iterator<Item = B> + Clone,
B: Borrow<Item<'a>>,
{
let local = self.naive_local();
DelayedFormat::new_with_offset(Some(local.date()), Some(local.time()), &self.offset, items)
}
/// Formats the combined date and time per the specified format string.
///
/// See the [`crate::format::strftime`] module for the supported escape sequences.
///
/// # Example
/// ```rust
/// use chrono::prelude::*;
///
/// let date_time: DateTime<Utc> = Utc.with_ymd_and_hms(2017, 04, 02, 12, 50, 32).unwrap();
/// let formatted = format!("{}", date_time.format("%d/%m/%Y %H:%M"));
/// assert_eq!(formatted, "02/04/2017 12:50");
/// ```
#[cfg(any(feature = "alloc", feature = "std"))]
#[cfg_attr(docsrs, doc(cfg(any(feature = "alloc", feature = "std"))))]
#[inline]
#[must_use]
pub fn format<'a>(&self, fmt: &'a str) -> DelayedFormat<StrftimeItems<'a>> {
self.format_with_items(StrftimeItems::new(fmt))
}
/// Formats the combined date and time with the specified formatting items and locale.
#[cfg(feature = "unstable-locales")]
#[cfg_attr(docsrs, doc(cfg(feature = "unstable-locales")))]
#[inline]
#[must_use]
pub fn format_localized_with_items<'a, I, B>(
&self,
items: I,
locale: Locale,
) -> DelayedFormat<I>
where
I: Iterator<Item = B> + Clone,
B: Borrow<Item<'a>>,
{
let local = self.naive_local();
DelayedFormat::new_with_offset_and_locale(
Some(local.date()),
Some(local.time()),
&self.offset,
items,
locale,
)
}
/// Formats the combined date and time per the specified format string and
/// locale.
///
/// See the [`crate::format::strftime`] module on the supported escape
/// sequences.
#[cfg(feature = "unstable-locales")]
#[cfg_attr(docsrs, doc(cfg(feature = "unstable-locales")))]
#[inline]
#[must_use]
pub fn format_localized<'a>(
&self,
fmt: &'a str,
locale: Locale,
) -> DelayedFormat<StrftimeItems<'a>> {
self.format_localized_with_items(StrftimeItems::new_with_locale(fmt, locale), locale)
}
}
impl<Tz: TimeZone> Datelike for DateTime<Tz> {
#[inline]
fn year(&self) -> i32 {
self.naive_local().year()
}
#[inline]
fn month(&self) -> u32 {
self.naive_local().month()
}
#[inline]
fn month0(&self) -> u32 {
self.naive_local().month0()
}
#[inline]
fn day(&self) -> u32 {
self.naive_local().day()
}
#[inline]
fn day0(&self) -> u32 {
self.naive_local().day0()
}
#[inline]
fn ordinal(&self) -> u32 {
self.naive_local().ordinal()
}
#[inline]
fn ordinal0(&self) -> u32 {
self.naive_local().ordinal0()
}
#[inline]
fn weekday(&self) -> Weekday {
self.naive_local().weekday()
}
#[inline]
fn iso_week(&self) -> IsoWeek {
self.naive_local().iso_week()
}
#[inline]
/// Makes a new `DateTime` with the year number changed, while keeping the same month and day.
///
/// See also the [`NaiveDate::with_year`] method.
///
/// # Errors
///
/// Returns `None` if:
/// - The resulting date does not exist.
/// - When the `NaiveDateTime` would be out of range.
/// - The local time at the resulting date does not exist or is ambiguous, for example during a
/// daylight saving time transition.
fn with_year(&self, year: i32) -> Option<DateTime<Tz>> {
map_local(self, |datetime| datetime.with_year(year))
}