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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/chrono-0.4.26/src/offset/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../chrono/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../chrono/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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</pre><pre class="rust"><code><span class="comment">// This is a part of Chrono.
// See README.md and LICENSE.txt for details.
</span><span class="doccomment">//! The time zone, which calculates offsets from the local time to UTC.
//!
//! There are four operations provided by the `TimeZone` trait:
//!
//! 1. Converting the local `NaiveDateTime` to `DateTime&lt;Tz&gt;`
//! 2. Converting the UTC `NaiveDateTime` to `DateTime&lt;Tz&gt;`
//! 3. Converting `DateTime&lt;Tz&gt;` to the local `NaiveDateTime`
//! 4. Constructing `DateTime&lt;Tz&gt;` objects from various offsets
//!
//! 1 is used for constructors. 2 is used for the `with_timezone` method of date and time types.
//! 3 is used for other methods, e.g. `year()` or `format()`, and provided by an associated type
//! which implements `Offset` (which then passed to `TimeZone` for actual implementations).
//! Technically speaking `TimeZone` has a total knowledge about given timescale,
//! but `Offset` is used as a cache to avoid the repeated conversion
//! and provides implementations for 1 and 3.
//! An `TimeZone` instance can be reconstructed from the corresponding `Offset` instance.
</span><span class="kw">use </span>core::fmt;
<span class="kw">use </span><span class="kw">crate</span>::format::{parse, ParseResult, Parsed, StrftimeItems};
<span class="kw">use </span><span class="kw">crate</span>::naive::{NaiveDate, NaiveDateTime, NaiveTime};
<span class="kw">use </span><span class="kw">crate</span>::Weekday;
<span class="attribute">#[allow(deprecated)]
</span><span class="kw">use crate</span>::{Date, DateTime};
<span class="kw">mod </span>fixed;
<span class="kw">pub use </span><span class="self">self</span>::fixed::FixedOffset;
<span class="attribute">#[cfg(feature = <span class="string">&quot;clock&quot;</span>)]
</span><span class="kw">mod </span>local;
<span class="attribute">#[cfg(feature = <span class="string">&quot;clock&quot;</span>)]
</span><span class="kw">pub use </span><span class="self">self</span>::local::Local;
<span class="kw">mod </span>utc;
<span class="kw">pub use </span><span class="self">self</span>::utc::Utc;
<span class="doccomment">/// The conversion result from the local time to the timezone-aware datetime types.
</span><span class="attribute">#[derive(Clone, PartialEq, Debug, Copy, Eq, Hash)]
</span><span class="kw">pub enum </span>LocalResult&lt;T&gt; {
<span class="doccomment">/// Given local time representation is invalid.
/// This can occur when, for example, the positive timezone transition.
</span><span class="prelude-val">None</span>,
<span class="doccomment">/// Given local time representation has a single unique result.
</span>Single(T),
<span class="doccomment">/// Given local time representation has multiple results and thus ambiguous.
/// This can occur when, for example, the negative timezone transition.
</span>Ambiguous(T <span class="comment">/*min*/</span>, T <span class="comment">/*max*/</span>),
}
<span class="kw">impl</span>&lt;T&gt; LocalResult&lt;T&gt; {
<span class="doccomment">/// Returns `Some` only when the conversion result is unique, or `None` otherwise.
</span><span class="attribute">#[must_use]
</span><span class="kw">pub fn </span>single(<span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;T&gt; {
<span class="kw">match </span><span class="self">self </span>{
LocalResult::Single(t) =&gt; <span class="prelude-val">Some</span>(t),
<span class="kw">_ </span>=&gt; <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Returns `Some` for the earliest possible conversion result, or `None` if none.
</span><span class="attribute">#[must_use]
</span><span class="kw">pub fn </span>earliest(<span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;T&gt; {
<span class="kw">match </span><span class="self">self </span>{
LocalResult::Single(t) | LocalResult::Ambiguous(t, <span class="kw">_</span>) =&gt; <span class="prelude-val">Some</span>(t),
<span class="kw">_ </span>=&gt; <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Returns `Some` for the latest possible conversion result, or `None` if none.
</span><span class="attribute">#[must_use]
</span><span class="kw">pub fn </span>latest(<span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;T&gt; {
<span class="kw">match </span><span class="self">self </span>{
LocalResult::Single(t) | LocalResult::Ambiguous(<span class="kw">_</span>, t) =&gt; <span class="prelude-val">Some</span>(t),
<span class="kw">_ </span>=&gt; <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Maps a `LocalResult&lt;T&gt;` into `LocalResult&lt;U&gt;` with given function.
</span><span class="attribute">#[must_use]
</span><span class="kw">pub fn </span>map&lt;U, F: FnMut(T) -&gt; U&gt;(<span class="self">self</span>, <span class="kw-2">mut </span>f: F) -&gt; LocalResult&lt;U&gt; {
<span class="kw">match </span><span class="self">self </span>{
LocalResult::None =&gt; LocalResult::None,
LocalResult::Single(v) =&gt; LocalResult::Single(f(v)),
LocalResult::Ambiguous(min, max) =&gt; LocalResult::Ambiguous(f(min), f(max)),
}
}
}
<span class="attribute">#[allow(deprecated)]
</span><span class="kw">impl</span>&lt;Tz: TimeZone&gt; LocalResult&lt;Date&lt;Tz&gt;&gt; {
<span class="doccomment">/// Makes a new `DateTime` from the current date and given `NaiveTime`.
/// The offset in the current date is preserved.
///
/// Propagates any error. Ambiguous result would be discarded.
</span><span class="attribute">#[inline]
#[must_use]
</span><span class="kw">pub fn </span>and_time(<span class="self">self</span>, time: NaiveTime) -&gt; LocalResult&lt;DateTime&lt;Tz&gt;&gt; {
<span class="kw">match </span><span class="self">self </span>{
LocalResult::Single(d) =&gt; {
d.and_time(time).map_or(LocalResult::None, LocalResult::Single)
}
<span class="kw">_ </span>=&gt; LocalResult::None,
}
}
<span class="doccomment">/// Makes a new `DateTime` from the current date, hour, minute and second.
/// The offset in the current date is preserved.
///
/// Propagates any error. Ambiguous result would be discarded.
</span><span class="attribute">#[inline]
#[must_use]
</span><span class="kw">pub fn </span>and_hms_opt(<span class="self">self</span>, hour: u32, min: u32, sec: u32) -&gt; LocalResult&lt;DateTime&lt;Tz&gt;&gt; {
<span class="kw">match </span><span class="self">self </span>{
LocalResult::Single(d) =&gt; {
d.and_hms_opt(hour, min, sec).map_or(LocalResult::None, LocalResult::Single)
}
<span class="kw">_ </span>=&gt; LocalResult::None,
}
}
<span class="doccomment">/// Makes a new `DateTime` from the current date, hour, minute, second and millisecond.
/// The millisecond part can exceed 1,000 in order to represent the leap second.
/// The offset in the current date is preserved.
///
/// Propagates any error. Ambiguous result would be discarded.
</span><span class="attribute">#[inline]
#[must_use]
</span><span class="kw">pub fn </span>and_hms_milli_opt(
<span class="self">self</span>,
hour: u32,
min: u32,
sec: u32,
milli: u32,
) -&gt; LocalResult&lt;DateTime&lt;Tz&gt;&gt; {
<span class="kw">match </span><span class="self">self </span>{
LocalResult::Single(d) =&gt; d
.and_hms_milli_opt(hour, min, sec, milli)
.map_or(LocalResult::None, LocalResult::Single),
<span class="kw">_ </span>=&gt; LocalResult::None,
}
}
<span class="doccomment">/// Makes a new `DateTime` from the current date, hour, minute, second and microsecond.
/// The microsecond part can exceed 1,000,000 in order to represent the leap second.
/// The offset in the current date is preserved.
///
/// Propagates any error. Ambiguous result would be discarded.
</span><span class="attribute">#[inline]
#[must_use]
</span><span class="kw">pub fn </span>and_hms_micro_opt(
<span class="self">self</span>,
hour: u32,
min: u32,
sec: u32,
micro: u32,
) -&gt; LocalResult&lt;DateTime&lt;Tz&gt;&gt; {
<span class="kw">match </span><span class="self">self </span>{
LocalResult::Single(d) =&gt; d
.and_hms_micro_opt(hour, min, sec, micro)
.map_or(LocalResult::None, LocalResult::Single),
<span class="kw">_ </span>=&gt; LocalResult::None,
}
}
<span class="doccomment">/// Makes a new `DateTime` 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.
/// The offset in the current date is preserved.
///
/// Propagates any error. Ambiguous result would be discarded.
</span><span class="attribute">#[inline]
#[must_use]
</span><span class="kw">pub fn </span>and_hms_nano_opt(
<span class="self">self</span>,
hour: u32,
min: u32,
sec: u32,
nano: u32,
) -&gt; LocalResult&lt;DateTime&lt;Tz&gt;&gt; {
<span class="kw">match </span><span class="self">self </span>{
LocalResult::Single(d) =&gt; d
.and_hms_nano_opt(hour, min, sec, nano)
.map_or(LocalResult::None, LocalResult::Single),
<span class="kw">_ </span>=&gt; LocalResult::None,
}
}
}
<span class="kw">impl</span>&lt;T: fmt::Debug&gt; LocalResult&lt;T&gt; {
<span class="doccomment">/// Returns the single unique conversion result, or panics accordingly.
</span><span class="attribute">#[must_use]
#[track_caller]
</span><span class="kw">pub fn </span>unwrap(<span class="self">self</span>) -&gt; T {
<span class="kw">match </span><span class="self">self </span>{
LocalResult::None =&gt; <span class="macro">panic!</span>(<span class="string">&quot;No such local time&quot;</span>),
LocalResult::Single(t) =&gt; t,
LocalResult::Ambiguous(t1, t2) =&gt; {
<span class="macro">panic!</span>(<span class="string">&quot;Ambiguous local time, ranging from {:?} to {:?}&quot;</span>, t1, t2)
}
}
}
}
<span class="doccomment">/// The offset from the local time to UTC.
</span><span class="kw">pub trait </span>Offset: Sized + Clone + fmt::Debug {
<span class="doccomment">/// Returns the fixed offset from UTC to the local time stored.
</span><span class="kw">fn </span>fix(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; FixedOffset;
}
<span class="doccomment">/// The time zone.
///
/// The methods here are the primarily constructors for [`Date`](../struct.Date.html) and
/// [`DateTime`](../struct.DateTime.html) types.
</span><span class="kw">pub trait </span>TimeZone: Sized + Clone {
<span class="doccomment">/// An associated offset type.
/// This type is used to store the actual offset in date and time types.
/// The original `TimeZone` value can be recovered via `TimeZone::from_offset`.
</span><span class="kw">type </span>Offset: Offset;
<span class="doccomment">/// Make a new `DateTime` from year, month, day, time components and current time zone.
///
/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
///
/// Returns `LocalResult::None` on invalid input data.
</span><span class="kw">fn </span>with_ymd_and_hms(
<span class="kw-2">&amp;</span><span class="self">self</span>,
year: i32,
month: u32,
day: u32,
hour: u32,
min: u32,
sec: u32,
) -&gt; LocalResult&lt;DateTime&lt;<span class="self">Self</span>&gt;&gt; {
<span class="kw">match </span>NaiveDate::from_ymd_opt(year, month, day).and_then(|d| d.and_hms_opt(hour, min, sec))
{
<span class="prelude-val">Some</span>(dt) =&gt; <span class="self">self</span>.from_local_datetime(<span class="kw-2">&amp;</span>dt),
<span class="prelude-val">None </span>=&gt; LocalResult::None,
}
}
<span class="doccomment">/// Makes a new `Date` from year, month, day and the current time zone.
/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
///
/// The time zone normally does not affect the date (unless it is between UTC-24 and UTC+24),
/// but it will propagate to the `DateTime` values constructed via this date.
///
/// Panics on the out-of-range date, invalid month and/or day.
</span><span class="attribute">#[deprecated(since = <span class="string">&quot;0.4.23&quot;</span>, note = <span class="string">&quot;use `with_ymd_and_hms()` instead&quot;</span>)]
#[allow(deprecated)]
</span><span class="kw">fn </span>ymd(<span class="kw-2">&amp;</span><span class="self">self</span>, year: i32, month: u32, day: u32) -&gt; Date&lt;<span class="self">Self</span>&gt; {
<span class="self">self</span>.ymd_opt(year, month, day).unwrap()
}
<span class="doccomment">/// Makes a new `Date` from year, month, day and the current time zone.
/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
///
/// The time zone normally does not affect the date (unless it is between UTC-24 and UTC+24),
/// but it will propagate to the `DateTime` values constructed via this date.
///
/// Returns `None` on the out-of-range date, invalid month and/or day.
</span><span class="attribute">#[deprecated(since = <span class="string">&quot;0.4.23&quot;</span>, note = <span class="string">&quot;use `with_ymd_and_hms()` instead&quot;</span>)]
#[allow(deprecated)]
</span><span class="kw">fn </span>ymd_opt(<span class="kw-2">&amp;</span><span class="self">self</span>, year: i32, month: u32, day: u32) -&gt; LocalResult&lt;Date&lt;<span class="self">Self</span>&gt;&gt; {
<span class="kw">match </span>NaiveDate::from_ymd_opt(year, month, day) {
<span class="prelude-val">Some</span>(d) =&gt; <span class="self">self</span>.from_local_date(<span class="kw-2">&amp;</span>d),
<span class="prelude-val">None </span>=&gt; LocalResult::None,
}
}
<span class="doccomment">/// Makes a new `Date` from year, day of year (DOY or &quot;ordinal&quot;) and the current time zone.
/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
///
/// The time zone normally does not affect the date (unless it is between UTC-24 and UTC+24),
/// but it will propagate to the `DateTime` values constructed via this date.
///
/// Panics on the out-of-range date and/or invalid DOY.
</span><span class="attribute">#[deprecated(
since = <span class="string">&quot;0.4.23&quot;</span>,
note = <span class="string">&quot;use `from_local_datetime()` with a `NaiveDateTime` instead&quot;
</span>)]
#[allow(deprecated)]
</span><span class="kw">fn </span>yo(<span class="kw-2">&amp;</span><span class="self">self</span>, year: i32, ordinal: u32) -&gt; Date&lt;<span class="self">Self</span>&gt; {
<span class="self">self</span>.yo_opt(year, ordinal).unwrap()
}
<span class="doccomment">/// Makes a new `Date` from year, day of year (DOY or &quot;ordinal&quot;) and the current time zone.
/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
///
/// The time zone normally does not affect the date (unless it is between UTC-24 and UTC+24),
/// but it will propagate to the `DateTime` values constructed via this date.
///
/// Returns `None` on the out-of-range date and/or invalid DOY.
</span><span class="attribute">#[deprecated(
since = <span class="string">&quot;0.4.23&quot;</span>,
note = <span class="string">&quot;use `from_local_datetime()` with a `NaiveDateTime` instead&quot;
</span>)]
#[allow(deprecated)]
</span><span class="kw">fn </span>yo_opt(<span class="kw-2">&amp;</span><span class="self">self</span>, year: i32, ordinal: u32) -&gt; LocalResult&lt;Date&lt;<span class="self">Self</span>&gt;&gt; {
<span class="kw">match </span>NaiveDate::from_yo_opt(year, ordinal) {
<span class="prelude-val">Some</span>(d) =&gt; <span class="self">self</span>.from_local_date(<span class="kw-2">&amp;</span>d),
<span class="prelude-val">None </span>=&gt; LocalResult::None,
}
}
<span class="doccomment">/// Makes a new `Date` from ISO week date (year and week number), day of the week (DOW) and
/// the current time zone.
/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
/// The resulting `Date` may have a different year from the input year.
///
/// The time zone normally does not affect the date (unless it is between UTC-24 and UTC+24),
/// but it will propagate to the `DateTime` values constructed via this date.
///
/// Panics on the out-of-range date and/or invalid week number.
</span><span class="attribute">#[deprecated(
since = <span class="string">&quot;0.4.23&quot;</span>,
note = <span class="string">&quot;use `from_local_datetime()` with a `NaiveDateTime` instead&quot;
</span>)]
#[allow(deprecated)]
</span><span class="kw">fn </span>isoywd(<span class="kw-2">&amp;</span><span class="self">self</span>, year: i32, week: u32, weekday: Weekday) -&gt; Date&lt;<span class="self">Self</span>&gt; {
<span class="self">self</span>.isoywd_opt(year, week, weekday).unwrap()
}
<span class="doccomment">/// Makes a new `Date` from ISO week date (year and week number), day of the week (DOW) and
/// the current time zone.
/// This assumes the proleptic Gregorian calendar, with the year 0 being 1 BCE.
/// The resulting `Date` may have a different year from the input year.
///
/// The time zone normally does not affect the date (unless it is between UTC-24 and UTC+24),
/// but it will propagate to the `DateTime` values constructed via this date.
///
/// Returns `None` on the out-of-range date and/or invalid week number.
</span><span class="attribute">#[deprecated(
since = <span class="string">&quot;0.4.23&quot;</span>,
note = <span class="string">&quot;use `from_local_datetime()` with a `NaiveDateTime` instead&quot;
</span>)]
#[allow(deprecated)]
</span><span class="kw">fn </span>isoywd_opt(<span class="kw-2">&amp;</span><span class="self">self</span>, year: i32, week: u32, weekday: Weekday) -&gt; LocalResult&lt;Date&lt;<span class="self">Self</span>&gt;&gt; {
<span class="kw">match </span>NaiveDate::from_isoywd_opt(year, week, weekday) {
<span class="prelude-val">Some</span>(d) =&gt; <span class="self">self</span>.from_local_date(<span class="kw-2">&amp;</span>d),
<span class="prelude-val">None </span>=&gt; LocalResult::None,
}
}
<span class="doccomment">/// Makes a new `DateTime` from the number of non-leap seconds
/// since January 1, 1970 0:00:00 UTC (aka &quot;UNIX timestamp&quot;)
/// and the number of nanoseconds since the last whole non-leap second.
///
/// Panics on the out-of-range number of seconds and/or invalid nanosecond,
/// for a non-panicking version see [`timestamp_opt`](#method.timestamp_opt).
</span><span class="attribute">#[deprecated(since = <span class="string">&quot;0.4.23&quot;</span>, note = <span class="string">&quot;use `timestamp_opt()` instead&quot;</span>)]
</span><span class="kw">fn </span>timestamp(<span class="kw-2">&amp;</span><span class="self">self</span>, secs: i64, nsecs: u32) -&gt; DateTime&lt;<span class="self">Self</span>&gt; {
<span class="self">self</span>.timestamp_opt(secs, nsecs).unwrap()
}
<span class="doccomment">/// Makes a new `DateTime` from the number of non-leap seconds
/// since January 1, 1970 0:00:00 UTC (aka &quot;UNIX timestamp&quot;)
/// and the number of nanoseconds since the last whole non-leap second.
///
/// Returns `LocalResult::None` on out-of-range number of seconds and/or
/// invalid nanosecond, otherwise always returns `LocalResult::Single`.
///
/// # Example
///
/// ```
/// use chrono::{Utc, TimeZone};
///
/// assert_eq!(Utc.timestamp_opt(1431648000, 0).unwrap().to_string(), &quot;2015-05-15 00:00:00 UTC&quot;);
/// ```
</span><span class="kw">fn </span>timestamp_opt(<span class="kw-2">&amp;</span><span class="self">self</span>, secs: i64, nsecs: u32) -&gt; LocalResult&lt;DateTime&lt;<span class="self">Self</span>&gt;&gt; {
<span class="kw">match </span>NaiveDateTime::from_timestamp_opt(secs, nsecs) {
<span class="prelude-val">Some</span>(dt) =&gt; LocalResult::Single(<span class="self">self</span>.from_utc_datetime(<span class="kw-2">&amp;</span>dt)),
<span class="prelude-val">None </span>=&gt; LocalResult::None,
}
}
<span class="doccomment">/// Makes a new `DateTime` from the number of non-leap milliseconds
/// since January 1, 1970 0:00:00 UTC (aka &quot;UNIX timestamp&quot;).
///
/// Panics on out-of-range number of milliseconds for a non-panicking
/// version see [`timestamp_millis_opt`](#method.timestamp_millis_opt).
</span><span class="attribute">#[deprecated(since = <span class="string">&quot;0.4.23&quot;</span>, note = <span class="string">&quot;use `timestamp_millis_opt()` instead&quot;</span>)]
</span><span class="kw">fn </span>timestamp_millis(<span class="kw-2">&amp;</span><span class="self">self</span>, millis: i64) -&gt; DateTime&lt;<span class="self">Self</span>&gt; {
<span class="self">self</span>.timestamp_millis_opt(millis).unwrap()
}
<span class="doccomment">/// Makes a new `DateTime` from the number of non-leap milliseconds
/// since January 1, 1970 0:00:00 UTC (aka &quot;UNIX timestamp&quot;).
///
///
/// Returns `LocalResult::None` on out-of-range number of milliseconds
/// and/or invalid nanosecond, otherwise always returns
/// `LocalResult::Single`.
///
/// # Example
///
/// ```
/// use chrono::{Utc, TimeZone, LocalResult};
/// match Utc.timestamp_millis_opt(1431648000) {
/// LocalResult::Single(dt) =&gt; assert_eq!(dt.timestamp(), 1431648),
/// _ =&gt; panic!(&quot;Incorrect timestamp_millis&quot;),
/// };
/// ```
</span><span class="kw">fn </span>timestamp_millis_opt(<span class="kw-2">&amp;</span><span class="self">self</span>, millis: i64) -&gt; LocalResult&lt;DateTime&lt;<span class="self">Self</span>&gt;&gt; {
<span class="kw">let </span>(<span class="kw-2">mut </span>secs, <span class="kw-2">mut </span>millis) = (millis / <span class="number">1000</span>, millis % <span class="number">1000</span>);
<span class="kw">if </span>millis &lt; <span class="number">0 </span>{
secs -= <span class="number">1</span>;
millis += <span class="number">1000</span>;
}
<span class="self">self</span>.timestamp_opt(secs, millis <span class="kw">as </span>u32 * <span class="number">1_000_000</span>)
}
<span class="doccomment">/// Makes a new `DateTime` from the number of non-leap nanoseconds
/// since January 1, 1970 0:00:00 UTC (aka &quot;UNIX timestamp&quot;).
///
/// Unlike [`timestamp_millis`](#method.timestamp_millis), this never
/// panics.
///
/// # Example
///
/// ```
/// use chrono::{Utc, TimeZone};
///
/// assert_eq!(Utc.timestamp_nanos(1431648000000000).timestamp(), 1431648);
/// ```
</span><span class="kw">fn </span>timestamp_nanos(<span class="kw-2">&amp;</span><span class="self">self</span>, nanos: i64) -&gt; DateTime&lt;<span class="self">Self</span>&gt; {
<span class="kw">let </span>(<span class="kw-2">mut </span>secs, <span class="kw-2">mut </span>nanos) = (nanos / <span class="number">1_000_000_000</span>, nanos % <span class="number">1_000_000_000</span>);
<span class="kw">if </span>nanos &lt; <span class="number">0 </span>{
secs -= <span class="number">1</span>;
nanos += <span class="number">1_000_000_000</span>;
}
<span class="self">self</span>.timestamp_opt(secs, nanos <span class="kw">as </span>u32).unwrap()
}
<span class="doccomment">/// Parses a string with the specified format string and returns a
/// `DateTime` with the current offset.
///
/// See the [`crate::format::strftime`] module on the
/// supported escape sequences.
///
/// If the to-be-parsed string includes an offset, it *must* match the
/// offset of the TimeZone, otherwise an error will be returned.
///
/// See also [`DateTime::parse_from_str`] which gives a [`DateTime`] with
/// parsed [`FixedOffset`].
</span><span class="kw">fn </span>datetime_from_str(<span class="kw-2">&amp;</span><span class="self">self</span>, s: <span class="kw-2">&amp;</span>str, fmt: <span class="kw-2">&amp;</span>str) -&gt; ParseResult&lt;DateTime&lt;<span class="self">Self</span>&gt;&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>parsed = Parsed::new();
parse(<span class="kw-2">&amp;mut </span>parsed, s, StrftimeItems::new(fmt))<span class="question-mark">?</span>;
parsed.to_datetime_with_timezone(<span class="self">self</span>)
}
<span class="doccomment">/// Reconstructs the time zone from the offset.
</span><span class="kw">fn </span>from_offset(offset: <span class="kw-2">&amp;</span><span class="self">Self</span>::Offset) -&gt; <span class="self">Self</span>;
<span class="doccomment">/// Creates the offset(s) for given local `NaiveDate` if possible.
</span><span class="kw">fn </span>offset_from_local_date(<span class="kw-2">&amp;</span><span class="self">self</span>, local: <span class="kw-2">&amp;</span>NaiveDate) -&gt; LocalResult&lt;<span class="self">Self</span>::Offset&gt;;
<span class="doccomment">/// Creates the offset(s) for given local `NaiveDateTime` if possible.
</span><span class="kw">fn </span>offset_from_local_datetime(<span class="kw-2">&amp;</span><span class="self">self</span>, local: <span class="kw-2">&amp;</span>NaiveDateTime) -&gt; LocalResult&lt;<span class="self">Self</span>::Offset&gt;;
<span class="doccomment">/// Converts the local `NaiveDate` to the timezone-aware `Date` if possible.
</span><span class="attribute">#[allow(clippy::wrong_self_convention)]
#[deprecated(since = <span class="string">&quot;0.4.23&quot;</span>, note = <span class="string">&quot;use `from_local_datetime()` instead&quot;</span>)]
#[allow(deprecated)]
</span><span class="kw">fn </span>from_local_date(<span class="kw-2">&amp;</span><span class="self">self</span>, local: <span class="kw-2">&amp;</span>NaiveDate) -&gt; LocalResult&lt;Date&lt;<span class="self">Self</span>&gt;&gt; {
<span class="self">self</span>.offset_from_local_date(local).map(|offset| {
<span class="comment">// since FixedOffset is within +/- 1 day, the date is never affected
</span>Date::from_utc(<span class="kw-2">*</span>local, offset)
})
}
<span class="doccomment">/// Converts the local `NaiveDateTime` to the timezone-aware `DateTime` if possible.
</span><span class="attribute">#[allow(clippy::wrong_self_convention)]
</span><span class="kw">fn </span>from_local_datetime(<span class="kw-2">&amp;</span><span class="self">self</span>, local: <span class="kw-2">&amp;</span>NaiveDateTime) -&gt; LocalResult&lt;DateTime&lt;<span class="self">Self</span>&gt;&gt; {
<span class="self">self</span>.offset_from_local_datetime(local)
.map(|offset| DateTime::from_utc(<span class="kw-2">*</span>local - offset.fix(), offset))
}
<span class="doccomment">/// Creates the offset for given UTC `NaiveDate`. This cannot fail.
</span><span class="kw">fn </span>offset_from_utc_date(<span class="kw-2">&amp;</span><span class="self">self</span>, utc: <span class="kw-2">&amp;</span>NaiveDate) -&gt; <span class="self">Self</span>::Offset;
<span class="doccomment">/// Creates the offset for given UTC `NaiveDateTime`. This cannot fail.
</span><span class="kw">fn </span>offset_from_utc_datetime(<span class="kw-2">&amp;</span><span class="self">self</span>, utc: <span class="kw-2">&amp;</span>NaiveDateTime) -&gt; <span class="self">Self</span>::Offset;
<span class="doccomment">/// Converts the UTC `NaiveDate` to the local time.
/// The UTC is continuous and thus this cannot fail (but can give the duplicate local time).
</span><span class="attribute">#[allow(clippy::wrong_self_convention)]
#[deprecated(since = <span class="string">&quot;0.4.23&quot;</span>, note = <span class="string">&quot;use `from_utc_datetime()` instead&quot;</span>)]
#[allow(deprecated)]
</span><span class="kw">fn </span>from_utc_date(<span class="kw-2">&amp;</span><span class="self">self</span>, utc: <span class="kw-2">&amp;</span>NaiveDate) -&gt; Date&lt;<span class="self">Self</span>&gt; {
Date::from_utc(<span class="kw-2">*</span>utc, <span class="self">self</span>.offset_from_utc_date(utc))
}
<span class="doccomment">/// Converts the UTC `NaiveDateTime` to the local time.
/// The UTC is continuous and thus this cannot fail (but can give the duplicate local time).
</span><span class="attribute">#[allow(clippy::wrong_self_convention)]
</span><span class="kw">fn </span>from_utc_datetime(<span class="kw-2">&amp;</span><span class="self">self</span>, utc: <span class="kw-2">&amp;</span>NaiveDateTime) -&gt; DateTime&lt;<span class="self">Self</span>&gt; {
DateTime::from_utc(<span class="kw-2">*</span>utc, <span class="self">self</span>.offset_from_utc_datetime(utc))
}
}
<span class="attribute">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use super</span>::<span class="kw-2">*</span>;
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_negative_millis() {
<span class="kw">let </span>dt = Utc.timestamp_millis_opt(-<span class="number">1000</span>).unwrap();
<span class="macro">assert_eq!</span>(dt.to_string(), <span class="string">&quot;1969-12-31 23:59:59 UTC&quot;</span>);
<span class="kw">let </span>dt = Utc.timestamp_millis_opt(-<span class="number">7000</span>).unwrap();
<span class="macro">assert_eq!</span>(dt.to_string(), <span class="string">&quot;1969-12-31 23:59:53 UTC&quot;</span>);
<span class="kw">let </span>dt = Utc.timestamp_millis_opt(-<span class="number">7001</span>).unwrap();
<span class="macro">assert_eq!</span>(dt.to_string(), <span class="string">&quot;1969-12-31 23:59:52.999 UTC&quot;</span>);
<span class="kw">let </span>dt = Utc.timestamp_millis_opt(-<span class="number">7003</span>).unwrap();
<span class="macro">assert_eq!</span>(dt.to_string(), <span class="string">&quot;1969-12-31 23:59:52.997 UTC&quot;</span>);
<span class="kw">let </span>dt = Utc.timestamp_millis_opt(-<span class="number">999</span>).unwrap();
<span class="macro">assert_eq!</span>(dt.to_string(), <span class="string">&quot;1969-12-31 23:59:59.001 UTC&quot;</span>);
<span class="kw">let </span>dt = Utc.timestamp_millis_opt(-<span class="number">1</span>).unwrap();
<span class="macro">assert_eq!</span>(dt.to_string(), <span class="string">&quot;1969-12-31 23:59:59.999 UTC&quot;</span>);
<span class="kw">let </span>dt = Utc.timestamp_millis_opt(-<span class="number">60000</span>).unwrap();
<span class="macro">assert_eq!</span>(dt.to_string(), <span class="string">&quot;1969-12-31 23:59:00 UTC&quot;</span>);
<span class="kw">let </span>dt = Utc.timestamp_millis_opt(-<span class="number">3600000</span>).unwrap();
<span class="macro">assert_eq!</span>(dt.to_string(), <span class="string">&quot;1969-12-31 23:00:00 UTC&quot;</span>);
<span class="kw">for </span>(millis, expected) <span class="kw">in </span><span class="kw-2">&amp;</span>[
(-<span class="number">7000</span>, <span class="string">&quot;1969-12-31 23:59:53 UTC&quot;</span>),
(-<span class="number">7001</span>, <span class="string">&quot;1969-12-31 23:59:52.999 UTC&quot;</span>),
(-<span class="number">7003</span>, <span class="string">&quot;1969-12-31 23:59:52.997 UTC&quot;</span>),
] {
<span class="kw">match </span>Utc.timestamp_millis_opt(<span class="kw-2">*</span>millis) {
LocalResult::Single(dt) =&gt; {
<span class="macro">assert_eq!</span>(dt.to_string(), <span class="kw-2">*</span>expected);
}
e =&gt; <span class="macro">panic!</span>(<span class="string">&quot;Got {:?} instead of an okay answer&quot;</span>, e),
}
}
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_negative_nanos() {
<span class="kw">let </span>dt = Utc.timestamp_nanos(-<span class="number">1_000_000_000</span>);
<span class="macro">assert_eq!</span>(dt.to_string(), <span class="string">&quot;1969-12-31 23:59:59 UTC&quot;</span>);
<span class="kw">let </span>dt = Utc.timestamp_nanos(-<span class="number">999_999_999</span>);
<span class="macro">assert_eq!</span>(dt.to_string(), <span class="string">&quot;1969-12-31 23:59:59.000000001 UTC&quot;</span>);
<span class="kw">let </span>dt = Utc.timestamp_nanos(-<span class="number">1</span>);
<span class="macro">assert_eq!</span>(dt.to_string(), <span class="string">&quot;1969-12-31 23:59:59.999999999 UTC&quot;</span>);
<span class="kw">let </span>dt = Utc.timestamp_nanos(-<span class="number">60_000_000_000</span>);
<span class="macro">assert_eq!</span>(dt.to_string(), <span class="string">&quot;1969-12-31 23:59:00 UTC&quot;</span>);
<span class="kw">let </span>dt = Utc.timestamp_nanos(-<span class="number">3_600_000_000_000</span>);
<span class="macro">assert_eq!</span>(dt.to_string(), <span class="string">&quot;1969-12-31 23:00:00 UTC&quot;</span>);
}
<span class="attribute">#[test]
</span><span class="kw">fn </span>test_nanos_never_panics() {
Utc.timestamp_nanos(i64::max_value());
Utc.timestamp_nanos(i64::default());
Utc.timestamp_nanos(i64::min_value());
}
}
</code></pre></div>
</section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="chrono" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>