| <!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/traits.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>traits.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="kw">use crate</span>::{IsoWeek, Weekday}; |
| |
| <span class="doccomment">/// The common set of methods for date component. |
| </span><span class="kw">pub trait </span>Datelike: Sized { |
| <span class="doccomment">/// Returns the year number in the [calendar date](./naive/struct.NaiveDate.html#calendar-date). |
| </span><span class="kw">fn </span>year(<span class="kw-2">&</span><span class="self">self</span>) -> i32; |
| |
| <span class="doccomment">/// Returns the absolute year number starting from 1 with a boolean flag, |
| /// which is false when the year predates the epoch (BCE/BC) and true otherwise (CE/AD). |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>year_ce(<span class="kw-2">&</span><span class="self">self</span>) -> (bool, u32) { |
| <span class="kw">let </span>year = <span class="self">self</span>.year(); |
| <span class="kw">if </span>year < <span class="number">1 </span>{ |
| (<span class="bool-val">false</span>, (<span class="number">1 </span>- year) <span class="kw">as </span>u32) |
| } <span class="kw">else </span>{ |
| (<span class="bool-val">true</span>, year <span class="kw">as </span>u32) |
| } |
| } |
| |
| <span class="doccomment">/// Returns the month number starting from 1. |
| /// |
| /// The return value ranges from 1 to 12. |
| </span><span class="kw">fn </span>month(<span class="kw-2">&</span><span class="self">self</span>) -> u32; |
| |
| <span class="doccomment">/// Returns the month number starting from 0. |
| /// |
| /// The return value ranges from 0 to 11. |
| </span><span class="kw">fn </span>month0(<span class="kw-2">&</span><span class="self">self</span>) -> u32; |
| |
| <span class="doccomment">/// Returns the day of month starting from 1. |
| /// |
| /// The return value ranges from 1 to 31. (The last day of month differs by months.) |
| </span><span class="kw">fn </span>day(<span class="kw-2">&</span><span class="self">self</span>) -> u32; |
| |
| <span class="doccomment">/// Returns the day of month starting from 0. |
| /// |
| /// The return value ranges from 0 to 30. (The last day of month differs by months.) |
| </span><span class="kw">fn </span>day0(<span class="kw-2">&</span><span class="self">self</span>) -> u32; |
| |
| <span class="doccomment">/// Returns the day of year starting from 1. |
| /// |
| /// The return value ranges from 1 to 366. (The last day of year differs by years.) |
| </span><span class="kw">fn </span>ordinal(<span class="kw-2">&</span><span class="self">self</span>) -> u32; |
| |
| <span class="doccomment">/// Returns the day of year starting from 0. |
| /// |
| /// The return value ranges from 0 to 365. (The last day of year differs by years.) |
| </span><span class="kw">fn </span>ordinal0(<span class="kw-2">&</span><span class="self">self</span>) -> u32; |
| |
| <span class="doccomment">/// Returns the day of week. |
| </span><span class="kw">fn </span>weekday(<span class="kw-2">&</span><span class="self">self</span>) -> Weekday; |
| |
| <span class="doccomment">/// Returns the ISO week. |
| </span><span class="kw">fn </span>iso_week(<span class="kw-2">&</span><span class="self">self</span>) -> IsoWeek; |
| |
| <span class="doccomment">/// Makes a new value with the year number changed. |
| /// |
| /// Returns `None` when the resulting value would be invalid. |
| </span><span class="kw">fn </span>with_year(<span class="kw-2">&</span><span class="self">self</span>, year: i32) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| |
| <span class="doccomment">/// Makes a new value with the month number (starting from 1) changed. |
| /// |
| /// Returns `None` when the resulting value would be invalid. |
| </span><span class="kw">fn </span>with_month(<span class="kw-2">&</span><span class="self">self</span>, month: u32) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| |
| <span class="doccomment">/// Makes a new value with the month number (starting from 0) changed. |
| /// |
| /// Returns `None` when the resulting value would be invalid. |
| </span><span class="kw">fn </span>with_month0(<span class="kw-2">&</span><span class="self">self</span>, month0: u32) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| |
| <span class="doccomment">/// Makes a new value with the day of month (starting from 1) changed. |
| /// |
| /// Returns `None` when the resulting value would be invalid. |
| </span><span class="kw">fn </span>with_day(<span class="kw-2">&</span><span class="self">self</span>, day: u32) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| |
| <span class="doccomment">/// Makes a new value with the day of month (starting from 0) changed. |
| /// |
| /// Returns `None` when the resulting value would be invalid. |
| </span><span class="kw">fn </span>with_day0(<span class="kw-2">&</span><span class="self">self</span>, day0: u32) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| |
| <span class="doccomment">/// Makes a new value with the day of year (starting from 1) changed. |
| /// |
| /// Returns `None` when the resulting value would be invalid. |
| </span><span class="kw">fn </span>with_ordinal(<span class="kw-2">&</span><span class="self">self</span>, ordinal: u32) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| |
| <span class="doccomment">/// Makes a new value with the day of year (starting from 0) changed. |
| /// |
| /// Returns `None` when the resulting value would be invalid. |
| </span><span class="kw">fn </span>with_ordinal0(<span class="kw-2">&</span><span class="self">self</span>, ordinal0: u32) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| |
| <span class="doccomment">/// Counts the days in the proleptic Gregorian calendar, with January 1, Year 1 (CE) as day 1. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use chrono::{NaiveDate, Datelike}; |
| /// |
| /// assert_eq!(NaiveDate::from_ymd_opt(1970, 1, 1).unwrap().num_days_from_ce(), 719_163); |
| /// assert_eq!(NaiveDate::from_ymd_opt(2, 1, 1).unwrap().num_days_from_ce(), 366); |
| /// assert_eq!(NaiveDate::from_ymd_opt(1, 1, 1).unwrap().num_days_from_ce(), 1); |
| /// assert_eq!(NaiveDate::from_ymd_opt(0, 1, 1).unwrap().num_days_from_ce(), -365); |
| /// ``` |
| </span><span class="kw">fn </span>num_days_from_ce(<span class="kw-2">&</span><span class="self">self</span>) -> i32 { |
| <span class="comment">// See test_num_days_from_ce_against_alternative_impl below for a more straightforward |
| // implementation. |
| |
| // we know this wouldn't overflow since year is limited to 1/2^13 of i32's full range. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>year = <span class="self">self</span>.year() - <span class="number">1</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>ndays = <span class="number">0</span>; |
| <span class="kw">if </span>year < <span class="number">0 </span>{ |
| <span class="kw">let </span>excess = <span class="number">1 </span>+ (-year) / <span class="number">400</span>; |
| year += excess * <span class="number">400</span>; |
| ndays -= excess * <span class="number">146_097</span>; |
| } |
| <span class="kw">let </span>div_100 = year / <span class="number">100</span>; |
| ndays += ((year * <span class="number">1461</span>) >> <span class="number">2</span>) - div_100 + (div_100 >> <span class="number">2</span>); |
| ndays + <span class="self">self</span>.ordinal() <span class="kw">as </span>i32 |
| } |
| } |
| |
| <span class="doccomment">/// The common set of methods for time component. |
| </span><span class="kw">pub trait </span>Timelike: Sized { |
| <span class="doccomment">/// Returns the hour number from 0 to 23. |
| </span><span class="kw">fn </span>hour(<span class="kw-2">&</span><span class="self">self</span>) -> u32; |
| |
| <span class="doccomment">/// Returns the hour number from 1 to 12 with a boolean flag, |
| /// which is false for AM and true for PM. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>hour12(<span class="kw-2">&</span><span class="self">self</span>) -> (bool, u32) { |
| <span class="kw">let </span>hour = <span class="self">self</span>.hour(); |
| <span class="kw">let </span><span class="kw-2">mut </span>hour12 = hour % <span class="number">12</span>; |
| <span class="kw">if </span>hour12 == <span class="number">0 </span>{ |
| hour12 = <span class="number">12</span>; |
| } |
| (hour >= <span class="number">12</span>, hour12) |
| } |
| |
| <span class="doccomment">/// Returns the minute number from 0 to 59. |
| </span><span class="kw">fn </span>minute(<span class="kw-2">&</span><span class="self">self</span>) -> u32; |
| |
| <span class="doccomment">/// Returns the second number from 0 to 59. |
| </span><span class="kw">fn </span>second(<span class="kw-2">&</span><span class="self">self</span>) -> u32; |
| |
| <span class="doccomment">/// Returns the number of nanoseconds since the whole non-leap second. |
| /// The range from 1,000,000,000 to 1,999,999,999 represents |
| /// the [leap second](./naive/struct.NaiveTime.html#leap-second-handling). |
| </span><span class="kw">fn </span>nanosecond(<span class="kw-2">&</span><span class="self">self</span>) -> u32; |
| |
| <span class="doccomment">/// Makes a new value with the hour number changed. |
| /// |
| /// Returns `None` when the resulting value would be invalid. |
| </span><span class="kw">fn </span>with_hour(<span class="kw-2">&</span><span class="self">self</span>, hour: u32) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| |
| <span class="doccomment">/// Makes a new value with the minute number changed. |
| /// |
| /// Returns `None` when the resulting value would be invalid. |
| </span><span class="kw">fn </span>with_minute(<span class="kw-2">&</span><span class="self">self</span>, min: u32) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| |
| <span class="doccomment">/// Makes a new value with the second number changed. |
| /// |
| /// Returns `None` when the resulting value would be invalid. |
| /// As with the [`second`](#tymethod.second) method, |
| /// the input range is restricted to 0 through 59. |
| </span><span class="kw">fn </span>with_second(<span class="kw-2">&</span><span class="self">self</span>, sec: u32) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| |
| <span class="doccomment">/// Makes a new value with nanoseconds since the whole non-leap second changed. |
| /// |
| /// Returns `None` when the resulting value would be invalid. |
| /// As with the [`nanosecond`](#tymethod.nanosecond) method, |
| /// the input range can exceed 1,000,000,000 for leap seconds. |
| </span><span class="kw">fn </span>with_nanosecond(<span class="kw-2">&</span><span class="self">self</span>, nano: u32) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>>; |
| |
| <span class="doccomment">/// Returns the number of non-leap seconds past the last midnight. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">fn </span>num_seconds_from_midnight(<span class="kw-2">&</span><span class="self">self</span>) -> u32 { |
| <span class="self">self</span>.hour() * <span class="number">3600 </span>+ <span class="self">self</span>.minute() * <span class="number">60 </span>+ <span class="self">self</span>.second() |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span><span class="kw">super</span>::Datelike; |
| <span class="kw">use crate</span>::{Duration, NaiveDate}; |
| |
| <span class="doccomment">/// Tests `Datelike::num_days_from_ce` against an alternative implementation. |
| /// |
| /// The alternative implementation is not as short as the current one but it is simpler to |
| /// understand, with less unexplained magic constants. |
| </span><span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_num_days_from_ce_against_alternative_impl() { |
| <span class="doccomment">/// Returns the number of multiples of `div` in the range `start..end`. |
| /// |
| /// If the range `start..end` is back-to-front, i.e. `start` is greater than `end`, the |
| /// behaviour is defined by the following equation: |
| /// `in_between(start, end, div) == - in_between(end, start, div)`. |
| /// |
| /// When `div` is 1, this is equivalent to `end - start`, i.e. the length of `start..end`. |
| /// |
| /// # Panics |
| /// |
| /// Panics if `div` is not positive. |
| </span><span class="kw">fn </span>in_between(start: i32, end: i32, div: i32) -> i32 { |
| <span class="macro">assert!</span>(div > <span class="number">0</span>, <span class="string">"in_between: nonpositive div = {}"</span>, div); |
| <span class="kw">let </span>start = (start.div_euclid(div), start.rem_euclid(div)); |
| <span class="kw">let </span>end = (end.div_euclid(div), end.rem_euclid(div)); |
| <span class="comment">// The lowest multiple of `div` greater than or equal to `start`, divided. |
| </span><span class="kw">let </span>start = start.<span class="number">0 </span>+ (start.<span class="number">1 </span>!= <span class="number">0</span>) <span class="kw">as </span>i32; |
| <span class="comment">// The lowest multiple of `div` greater than or equal to `end`, divided. |
| </span><span class="kw">let </span>end = end.<span class="number">0 </span>+ (end.<span class="number">1 </span>!= <span class="number">0</span>) <span class="kw">as </span>i32; |
| end - start |
| } |
| |
| <span class="doccomment">/// Alternative implementation to `Datelike::num_days_from_ce` |
| </span><span class="kw">fn </span>num_days_from_ce<Date: Datelike>(date: <span class="kw-2">&</span>Date) -> i32 { |
| <span class="kw">let </span>year = date.year(); |
| <span class="kw">let </span>diff = <span class="kw">move </span>|div| in_between(<span class="number">1</span>, year, div); |
| <span class="comment">// 365 days a year, one more in leap years. In the gregorian calendar, leap years are all |
| // the multiples of 4 except multiples of 100 but including multiples of 400. |
| </span>date.ordinal() <span class="kw">as </span>i32 + <span class="number">365 </span>* diff(<span class="number">1</span>) + diff(<span class="number">4</span>) - diff(<span class="number">100</span>) + diff(<span class="number">400</span>) |
| } |
| |
| <span class="kw">for </span>year <span class="kw">in </span>NaiveDate::MIN.year()..=NaiveDate::MAX.year() { |
| <span class="kw">let </span>jan1_year = NaiveDate::from_ymd_opt(year, <span class="number">1</span>, <span class="number">1</span>).unwrap(); |
| <span class="macro">assert_eq!</span>( |
| jan1_year.num_days_from_ce(), |
| num_days_from_ce(<span class="kw-2">&</span>jan1_year), |
| <span class="string">"on {:?}"</span>, |
| jan1_year |
| ); |
| <span class="kw">let </span>mid_year = jan1_year + Duration::days(<span class="number">133</span>); |
| <span class="macro">assert_eq!</span>( |
| mid_year.num_days_from_ce(), |
| num_days_from_ce(<span class="kw-2">&</span>mid_year), |
| <span class="string">"on {:?}"</span>, |
| mid_year |
| ); |
| } |
| } |
| } |
| </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> |
