| <!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/fixed.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>fixed.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 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="attribute">#[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>::naive::{NaiveDate, NaiveDateTime, NaiveTime}; |
| <span class="kw">use </span><span class="kw">crate</span>::oldtime::Duration <span class="kw">as </span>OldDuration; |
| <span class="kw">use </span><span class="kw">crate</span>::DateTime; |
| <span class="kw">use </span><span class="kw">crate</span>::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="attribute">#[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="attribute">#[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="attribute">#[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="attribute">#[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="attribute">#[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="attribute">#[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="attribute">#[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="attribute">#[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="attribute">#[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="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="attribute">#[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="attribute">#[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="attribute">#[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="attribute">#[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="attribute">#[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="attribute">#[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="attribute">#[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="attribute">#[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="attribute">#[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="macro">assert_eq!</span>( |
| <span class="macro">format!</span>( |
| <span class="string">"{:?}"</span>, |
| FixedOffset::east_opt(<span class="number">86399</span>) |
| .unwrap() |
| .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>.to_string() |
| ); |
| <span class="macro">assert_eq!</span>( |
| <span class="macro">format!</span>( |
| <span class="string">"{:?}"</span>, |
| FixedOffset::east_opt(<span class="number">86399</span>) |
| .unwrap() |
| .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>.to_string() |
| ); |
| <span class="macro">assert_eq!</span>( |
| <span class="macro">format!</span>( |
| <span class="string">"{:?}"</span>, |
| FixedOffset::west_opt(<span class="number">86399</span>) |
| .unwrap() |
| .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>.to_string() |
| ); |
| <span class="macro">assert_eq!</span>( |
| <span class="macro">format!</span>( |
| <span class="string">"{:?}"</span>, |
| FixedOffset::west_opt(<span class="number">86399</span>) |
| .unwrap() |
| .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>.to_string() |
| ); |
| } |
| } |
| </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> |
