<!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 `/Users/m018/.cargo/registry/src/github.com-1ecc6299db9ec823/chrono-0.4.31/src/offset/fixed.rs`."><title>fixed.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceSerif4-Bold-a2c9cd1067f8b328.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-c4dbdcde0fbd8430.css" id="mainThemeStyle"><link rel="stylesheet" id="themeStyle" href="../../../static.files/light-db279b6232be9c13.css"><link rel="stylesheet" disabled href="../../../static.files/dark-cf923f49f397b216.css"><link rel="stylesheet" disabled href="../../../static.files/ayu-be46fdc453a55015.css"><script src="../../../static.files/storage-3891ce972e3a2bf8.js"></script><script defer src="../../../static.files/source-script-1b95b7cca98b26e5.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../static.files/main-98a684e84ae5b08b.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-13285aec31fa243e.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-2c020d218678b618.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"></nav><main><nav class="sub"><a class="sub-logo-container" href="../../../chrono/index.html"><img class="rust-logo" src="../../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" 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="../../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><a href="#1" id="1">1</a>
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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 has a fixed offset from UTC.
</span><span class="kw">use </span>core::fmt;
<span class="kw">use </span>core::ops::{Add, Sub};
<span class="kw">use </span>core::str::FromStr;
<span class="attr">#[cfg(feature = <span class="string">"rkyv"</span>)]
</span><span class="kw">use </span>rkyv::{Archive, Deserialize, Serialize};
<span class="kw">use super</span>::{LocalResult, Offset, TimeZone};
<span class="kw">use </span><span class="kw">crate</span>::duration::Duration <span class="kw">as </span>OldDuration;
<span class="kw">use </span><span class="kw">crate</span>::format::{scan, OUT_OF_RANGE};
<span class="kw">use </span><span class="kw">crate</span>::naive::{NaiveDate, NaiveDateTime, NaiveTime};
<span class="kw">use crate</span>::{DateTime, ParseError, Timelike};
<span class="doccomment">/// The time zone with fixed offset, from UTC-23:59:59 to UTC+23:59:59.
///
/// Using the [`TimeZone`](./trait.TimeZone.html) methods
/// on a `FixedOffset` struct is the preferred way to construct
/// `DateTime<FixedOffset>` instances. See the [`east_opt`](#method.east_opt) and
/// [`west_opt`](#method.west_opt) methods for examples.
</span><span class="attr">#[derive(PartialEq, Eq, Hash, Copy, Clone)]
#[cfg_attr(feature = <span class="string">"rkyv"</span>, derive(Archive, Deserialize, Serialize))]
</span><span class="kw">pub struct </span>FixedOffset {
local_minus_utc: i32,
}
<span class="kw">impl </span>FixedOffset {
<span class="doccomment">/// Makes a new `FixedOffset` for the Eastern Hemisphere with given timezone difference.
/// The negative `secs` means the Western Hemisphere.
///
/// Panics on the out-of-bound `secs`.
</span><span class="attr">#[deprecated(since = <span class="string">"0.4.23"</span>, note = <span class="string">"use `east_opt()` instead"</span>)]
#[must_use]
</span><span class="kw">pub fn </span>east(secs: i32) -> FixedOffset {
FixedOffset::east_opt(secs).expect(<span class="string">"FixedOffset::east out of bounds"</span>)
}
<span class="doccomment">/// Makes a new `FixedOffset` for the Eastern Hemisphere with given timezone difference.
/// The negative `secs` means the Western Hemisphere.
///
/// Returns `None` on the out-of-bound `secs`.
///
/// # Example
///
</span><span class="attr">#[cfg_attr(not(feature = <span class="string">"std"</span>), doc = <span class="string">"```ignore"</span>)]
#[cfg_attr(feature = <span class="string">"std"</span>, doc = <span class="string">"```"</span>)]
</span><span class="doccomment">/// use chrono::{FixedOffset, TimeZone};
/// let hour = 3600;
/// let datetime = FixedOffset::east_opt(5 * hour)
/// .unwrap()
/// .with_ymd_and_hms(2016, 11, 08, 0, 0, 0)
/// .unwrap();
/// assert_eq!(&datetime.to_rfc3339(), "2016-11-08T00:00:00+05:00")
/// ```
</span><span class="attr">#[must_use]
</span><span class="kw">pub const fn </span>east_opt(secs: i32) -> <span class="prelude-ty">Option</span><FixedOffset> {
<span class="kw">if </span>-<span class="number">86_400 </span>< secs && secs < <span class="number">86_400 </span>{
<span class="prelude-val">Some</span>(FixedOffset { local_minus_utc: secs })
} <span class="kw">else </span>{
<span class="prelude-val">None
</span>}
}
<span class="doccomment">/// Makes a new `FixedOffset` for the Western Hemisphere with given timezone difference.
/// The negative `secs` means the Eastern Hemisphere.
///
/// Panics on the out-of-bound `secs`.
</span><span class="attr">#[deprecated(since = <span class="string">"0.4.23"</span>, note = <span class="string">"use `west_opt()` instead"</span>)]
#[must_use]
</span><span class="kw">pub fn </span>west(secs: i32) -> FixedOffset {
FixedOffset::west_opt(secs).expect(<span class="string">"FixedOffset::west out of bounds"</span>)
}
<span class="doccomment">/// Makes a new `FixedOffset` for the Western Hemisphere with given timezone difference.
/// The negative `secs` means the Eastern Hemisphere.
///
/// Returns `None` on the out-of-bound `secs`.
///
/// # Example
///
</span><span class="attr">#[cfg_attr(not(feature = <span class="string">"std"</span>), doc = <span class="string">"```ignore"</span>)]
#[cfg_attr(feature = <span class="string">"std"</span>, doc = <span class="string">"```"</span>)]
</span><span class="doccomment">/// use chrono::{FixedOffset, TimeZone};
/// let hour = 3600;
/// let datetime = FixedOffset::west_opt(5 * hour)
/// .unwrap()
/// .with_ymd_and_hms(2016, 11, 08, 0, 0, 0)
/// .unwrap();
/// assert_eq!(&datetime.to_rfc3339(), "2016-11-08T00:00:00-05:00")
/// ```
</span><span class="attr">#[must_use]
</span><span class="kw">pub const fn </span>west_opt(secs: i32) -> <span class="prelude-ty">Option</span><FixedOffset> {
<span class="kw">if </span>-<span class="number">86_400 </span>< secs && secs < <span class="number">86_400 </span>{
<span class="prelude-val">Some</span>(FixedOffset { local_minus_utc: -secs })
} <span class="kw">else </span>{
<span class="prelude-val">None
</span>}
}
<span class="doccomment">/// Returns the number of seconds to add to convert from UTC to the local time.
</span><span class="attr">#[inline]
</span><span class="kw">pub const fn </span>local_minus_utc(<span class="kw-2">&</span><span class="self">self</span>) -> i32 {
<span class="self">self</span>.local_minus_utc
}
<span class="doccomment">/// Returns the number of seconds to add to convert from the local time to UTC.
</span><span class="attr">#[inline]
</span><span class="kw">pub const fn </span>utc_minus_local(<span class="kw-2">&</span><span class="self">self</span>) -> i32 {
-<span class="self">self</span>.local_minus_utc
}
}
<span class="doccomment">/// Parsing a `str` into a `FixedOffset` uses the format [`%z`](crate::format::strftime).
</span><span class="kw">impl </span>FromStr <span class="kw">for </span>FixedOffset {
<span class="kw">type </span><span class="prelude-val">Err </span>= ParseError;
<span class="kw">fn </span>from_str(s: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, <span class="self">Self</span>::Err> {
<span class="kw">let </span>(<span class="kw">_</span>, offset) = scan::timezone_offset(s, scan::colon_or_space, <span class="bool-val">false</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>)<span class="question-mark">?</span>;
<span class="self">Self</span>::east_opt(offset).ok_or(OUT_OF_RANGE)
}
}
<span class="kw">impl </span>TimeZone <span class="kw">for </span>FixedOffset {
<span class="kw">type </span>Offset = FixedOffset;
<span class="kw">fn </span>from_offset(offset: <span class="kw-2">&</span>FixedOffset) -> FixedOffset {
<span class="kw-2">*</span>offset
}
<span class="kw">fn </span>offset_from_local_date(<span class="kw-2">&</span><span class="self">self</span>, _local: <span class="kw-2">&</span>NaiveDate) -> LocalResult<FixedOffset> {
LocalResult::Single(<span class="kw-2">*</span><span class="self">self</span>)
}
<span class="kw">fn </span>offset_from_local_datetime(<span class="kw-2">&</span><span class="self">self</span>, _local: <span class="kw-2">&</span>NaiveDateTime) -> LocalResult<FixedOffset> {
LocalResult::Single(<span class="kw-2">*</span><span class="self">self</span>)
}
<span class="kw">fn </span>offset_from_utc_date(<span class="kw-2">&</span><span class="self">self</span>, _utc: <span class="kw-2">&</span>NaiveDate) -> FixedOffset {
<span class="kw-2">*</span><span class="self">self
</span>}
<span class="kw">fn </span>offset_from_utc_datetime(<span class="kw-2">&</span><span class="self">self</span>, _utc: <span class="kw-2">&</span>NaiveDateTime) -> FixedOffset {
<span class="kw-2">*</span><span class="self">self
</span>}
}
<span class="kw">impl </span>Offset <span class="kw">for </span>FixedOffset {
<span class="kw">fn </span>fix(<span class="kw-2">&</span><span class="self">self</span>) -> FixedOffset {
<span class="kw-2">*</span><span class="self">self
</span>}
}
<span class="kw">impl </span>fmt::Debug <span class="kw">for </span>FixedOffset {
<span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result {
<span class="kw">let </span>offset = <span class="self">self</span>.local_minus_utc;
<span class="kw">let </span>(sign, offset) = <span class="kw">if </span>offset < <span class="number">0 </span>{ (<span class="string">'-'</span>, -offset) } <span class="kw">else </span>{ (<span class="string">'+'</span>, offset) };
<span class="kw">let </span>sec = offset.rem_euclid(<span class="number">60</span>);
<span class="kw">let </span>mins = offset.div_euclid(<span class="number">60</span>);
<span class="kw">let </span>min = mins.rem_euclid(<span class="number">60</span>);
<span class="kw">let </span>hour = mins.div_euclid(<span class="number">60</span>);
<span class="kw">if </span>sec == <span class="number">0 </span>{
<span class="macro">write!</span>(f, <span class="string">"{}{:02}:{:02}"</span>, sign, hour, min)
} <span class="kw">else </span>{
<span class="macro">write!</span>(f, <span class="string">"{}{:02}:{:02}:{:02}"</span>, sign, hour, min, sec)
}
}
}
<span class="kw">impl </span>fmt::Display <span class="kw">for </span>FixedOffset {
<span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result {
fmt::Debug::fmt(<span class="self">self</span>, f)
}
}
<span class="attr">#[cfg(feature = <span class="string">"arbitrary"</span>)]
</span><span class="kw">impl </span>arbitrary::Arbitrary<<span class="lifetime">'_</span>> <span class="kw">for </span>FixedOffset {
<span class="kw">fn </span>arbitrary(u: <span class="kw-2">&mut </span>arbitrary::Unstructured) -> arbitrary::Result<FixedOffset> {
<span class="kw">let </span>secs = u.int_in_range(-<span class="number">86_399</span>..=<span class="number">86_399</span>)<span class="question-mark">?</span>;
<span class="kw">let </span>fixed_offset = FixedOffset::east_opt(secs)
.expect(<span class="string">"Could not generate a valid chrono::FixedOffset. It looks like implementation of Arbitrary for FixedOffset is erroneous."</span>);
<span class="prelude-val">Ok</span>(fixed_offset)
}
}
<span class="comment">// addition or subtraction of FixedOffset to/from Timelike values is the same as
// adding or subtracting the offset's local_minus_utc value
// but keep keeps the leap second information.
// this should be implemented more efficiently, but for the time being, this is generic right now.
</span><span class="kw">fn </span>add_with_leapsecond<T>(lhs: <span class="kw-2">&</span>T, rhs: i32) -> T
<span class="kw">where
</span>T: Timelike + Add<OldDuration, Output = T>,
{
<span class="comment">// extract and temporarily remove the fractional part and later recover it
</span><span class="kw">let </span>nanos = lhs.nanosecond();
<span class="kw">let </span>lhs = lhs.with_nanosecond(<span class="number">0</span>).unwrap();
(lhs + OldDuration::seconds(i64::from(rhs))).with_nanosecond(nanos).unwrap()
}
<span class="kw">impl </span>Add<FixedOffset> <span class="kw">for </span>NaiveTime {
<span class="kw">type </span>Output = NaiveTime;
<span class="attr">#[inline]
</span><span class="kw">fn </span>add(<span class="self">self</span>, rhs: FixedOffset) -> NaiveTime {
add_with_leapsecond(<span class="kw-2">&</span><span class="self">self</span>, rhs.local_minus_utc)
}
}
<span class="kw">impl </span>Sub<FixedOffset> <span class="kw">for </span>NaiveTime {
<span class="kw">type </span>Output = NaiveTime;
<span class="attr">#[inline]
</span><span class="kw">fn </span>sub(<span class="self">self</span>, rhs: FixedOffset) -> NaiveTime {
add_with_leapsecond(<span class="kw-2">&</span><span class="self">self</span>, -rhs.local_minus_utc)
}
}
<span class="kw">impl </span>Add<FixedOffset> <span class="kw">for </span>NaiveDateTime {
<span class="kw">type </span>Output = NaiveDateTime;
<span class="attr">#[inline]
</span><span class="kw">fn </span>add(<span class="self">self</span>, rhs: FixedOffset) -> NaiveDateTime {
add_with_leapsecond(<span class="kw-2">&</span><span class="self">self</span>, rhs.local_minus_utc)
}
}
<span class="kw">impl </span>Sub<FixedOffset> <span class="kw">for </span>NaiveDateTime {
<span class="kw">type </span>Output = NaiveDateTime;
<span class="attr">#[inline]
</span><span class="kw">fn </span>sub(<span class="self">self</span>, rhs: FixedOffset) -> NaiveDateTime {
add_with_leapsecond(<span class="kw-2">&</span><span class="self">self</span>, -rhs.local_minus_utc)
}
}
<span class="kw">impl</span><Tz: TimeZone> Add<FixedOffset> <span class="kw">for </span>DateTime<Tz> {
<span class="kw">type </span>Output = DateTime<Tz>;
<span class="attr">#[inline]
</span><span class="kw">fn </span>add(<span class="self">self</span>, rhs: FixedOffset) -> DateTime<Tz> {
add_with_leapsecond(<span class="kw-2">&</span><span class="self">self</span>, rhs.local_minus_utc)
}
}
<span class="kw">impl</span><Tz: TimeZone> Sub<FixedOffset> <span class="kw">for </span>DateTime<Tz> {
<span class="kw">type </span>Output = DateTime<Tz>;
<span class="attr">#[inline]
</span><span class="kw">fn </span>sub(<span class="self">self</span>, rhs: FixedOffset) -> DateTime<Tz> {
add_with_leapsecond(<span class="kw-2">&</span><span class="self">self</span>, -rhs.local_minus_utc)
}
}
<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use </span><span class="kw">super</span>::FixedOffset;
<span class="kw">use </span><span class="kw">crate</span>::offset::TimeZone;
<span class="kw">use </span>std::str::FromStr;
<span class="attr">#[test]
</span><span class="kw">fn </span>test_date_extreme_offset() {
<span class="comment">// starting from 0.3 we don't have an offset exceeding one day.
// this makes everything easier!
</span><span class="kw">let </span>offset = FixedOffset::east_opt(<span class="number">86399</span>).unwrap();
<span class="macro">assert_eq!</span>(
<span class="macro">format!</span>(<span class="string">"{:?}"</span>, offset.with_ymd_and_hms(<span class="number">2012</span>, <span class="number">2</span>, <span class="number">29</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>).unwrap()),
<span class="string">"2012-02-29T05:06:07+23:59:59"
</span>);
<span class="kw">let </span>offset = FixedOffset::east_opt(-<span class="number">86399</span>).unwrap();
<span class="macro">assert_eq!</span>(
<span class="macro">format!</span>(<span class="string">"{:?}"</span>, offset.with_ymd_and_hms(<span class="number">2012</span>, <span class="number">2</span>, <span class="number">29</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>).unwrap()),
<span class="string">"2012-02-29T05:06:07-23:59:59"
</span>);
<span class="kw">let </span>offset = FixedOffset::west_opt(<span class="number">86399</span>).unwrap();
<span class="macro">assert_eq!</span>(
<span class="macro">format!</span>(<span class="string">"{:?}"</span>, offset.with_ymd_and_hms(<span class="number">2012</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>).unwrap()),
<span class="string">"2012-03-04T05:06:07-23:59:59"
</span>);
<span class="kw">let </span>offset = FixedOffset::west_opt(-<span class="number">86399</span>).unwrap();
<span class="macro">assert_eq!</span>(
<span class="macro">format!</span>(<span class="string">"{:?}"</span>, offset.with_ymd_and_hms(<span class="number">2012</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>).unwrap()),
<span class="string">"2012-03-04T05:06:07+23:59:59"
</span>);
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_parse_offset() {
<span class="kw">let </span>offset = FixedOffset::from_str(<span class="string">"-0500"</span>).unwrap();
<span class="macro">assert_eq!</span>(offset.local_minus_utc, -<span class="number">5 </span>* <span class="number">3600</span>);
<span class="kw">let </span>offset = FixedOffset::from_str(<span class="string">"-08:00"</span>).unwrap();
<span class="macro">assert_eq!</span>(offset.local_minus_utc, -<span class="number">8 </span>* <span class="number">3600</span>);
<span class="kw">let </span>offset = FixedOffset::from_str(<span class="string">"+06:30"</span>).unwrap();
<span class="macro">assert_eq!</span>(offset.local_minus_utc, (<span class="number">6 </span>* <span class="number">3600</span>) + <span class="number">1800</span>);
}
}
</code></pre></div>
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