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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="A type that can measure and format the current time."><title>FormatTime in tracing_subscriber::fmt::time - Rust</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/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-5bc39a1768837dd0.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="tracing_subscriber" data-themes="" data-resource-suffix="" data-rustdoc-version="1.77.2 (25ef9e3d8 2024-04-09)" data-channel="1.77.2" data-search-js="search-dd67cee4cfa65049.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../../static.files/storage-4c98445ec4002617.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../static.files/main-48f368f3872407c8.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-04d5337699b92874.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 trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../../tracing_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../../tracing_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../../../tracing_subscriber/index.html">tracing_subscriber</a><span class="version">0.3.18</span></h2></div><h2 class="location"><a href="#">FormatTime</a></h2><div class="sidebar-elems"><section><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.format_time">format_time</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-FormatTime-for-%26F">&amp;&#x27;a F</a></li><li><a href="#impl-FormatTime-for-()">()</a></li><li><a href="#impl-FormatTime-for-fn(%26mut+Writer%3C'b%3E)+-%3E+Result%3C(),+Error%3E">fn(_: &amp;mut Writer&lt;&#x27;_&gt;) -&gt; Result</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In tracing_subscriber::fmt::time</a></h2></div></nav><div class="sidebar-resizer"></div>
<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../../tracing_subscriber/all.html" title="show sidebar"></a></div><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" tabindex="-1"><a href="../../../help.html" title="help">?</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="main-heading"><h1>Trait <a href="../../index.html">tracing_subscriber</a>::<wbr><a href="../index.html">fmt</a>::<wbr><a href="index.html">time</a>::<wbr><a class="trait" href="#">FormatTime</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../../src/tracing_subscriber/fmt/time/mod.rs.html#47-54">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub trait FormatTime {
// Required method
fn <a href="#tymethod.format_time" class="fn">format_time</a>(&amp;self, w: &amp;mut <a class="struct" href="../format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.77.2/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a>;
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A type that can measure and format the current time.</p>
<p>This trait is used by <code>Format</code> to include a timestamp with each <code>Event</code> when it is logged.</p>
<p>Notable default implementations of this trait are <code>SystemTime</code> and <code>()</code>. The former prints the
current time as reported by <code>std::time::SystemTime</code>, and the latter does not print the current
time at all. <code>FormatTime</code> is also automatically implemented for any function pointer with the
appropriate signature.</p>
<p>The full list of provided implementations can be found in <a href="index.html" title="mod tracing_subscriber::fmt::time"><code>time</code></a>.</p>
</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.format_time" class="method"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/time/mod.rs.html#53">source</a><h4 class="code-header">fn <a href="#tymethod.format_time" class="fn">format_time</a>(&amp;self, w: &amp;mut <a class="struct" href="../format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.77.2/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class="docblock"><p>Measure and write out the current time.</p>
<p>When <code>format_time</code> is called, implementors should get the current time using their desired
mechanism, and write it out to the given <code>fmt::Write</code>. Implementors must insert a trailing
space themselves if they wish to separate the time from subsequent log message text.</p>
</div></details></div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-FormatTime-for-fn(%26mut+Writer%3C'b%3E)+-%3E+Result%3C(),+Error%3E" class="impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/time/mod.rs.html#104-108">source</a><a href="#impl-FormatTime-for-fn(%26mut+Writer%3C'b%3E)+-%3E+Result%3C(),+Error%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FormatTime.html" title="trait tracing_subscriber::fmt::time::FormatTime">FormatTime</a> for <a class="primitive" href="https://doc.rust-lang.org/1.77.2/std/primitive.fn.html">fn</a>(_: &amp;mut <a class="struct" href="../format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.77.2/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h3></section></summary><div class="impl-items"><section id="method.format_time" class="method trait-impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/time/mod.rs.html#105-107">source</a><a href="#method.format_time" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.format_time" class="fn">format_time</a>(&amp;self, w: &amp;mut <a class="struct" href="../format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.77.2/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-FormatTime-for-()" class="impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/time/mod.rs.html#98-102">source</a><a href="#impl-FormatTime-for-()" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FormatTime.html" title="trait tracing_subscriber::fmt::time::FormatTime">FormatTime</a> for <a class="primitive" href="https://doc.rust-lang.org/1.77.2/std/primitive.unit.html">()</a></h3></section></summary><div class="impl-items"><section id="method.format_time-1" class="method trait-impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/time/mod.rs.html#99-101">source</a><a href="#method.format_time-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.format_time" class="fn">format_time</a>(&amp;self, _: &amp;mut <a class="struct" href="../format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.77.2/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-FormatTime-for-%26F" class="impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/time/mod.rs.html#89-96">source</a><a href="#impl-FormatTime-for-%26F" class="anchor">§</a><h3 class="code-header">impl&lt;'a, F&gt; <a class="trait" href="trait.FormatTime.html" title="trait tracing_subscriber::fmt::time::FormatTime">FormatTime</a> for <a class="primitive" href="https://doc.rust-lang.org/1.77.2/std/primitive.reference.html">&amp;'a F</a><div class="where">where
F: <a class="trait" href="trait.FormatTime.html" title="trait tracing_subscriber::fmt::time::FormatTime">FormatTime</a>,</div></h3></section></summary><div class="impl-items"><section id="method.format_time-2" class="method trait-impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/time/mod.rs.html#93-95">source</a><a href="#method.format_time-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.format_time" class="fn">format_time</a>(&amp;self, w: &amp;mut <a class="struct" href="../format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.77.2/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-FormatTime-for-SystemTime" class="impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/time/mod.rs.html#136-144">source</a><a href="#impl-FormatTime-for-SystemTime" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FormatTime.html" title="trait tracing_subscriber::fmt::time::FormatTime">FormatTime</a> for <a class="struct" href="struct.SystemTime.html" title="struct tracing_subscriber::fmt::time::SystemTime">SystemTime</a></h3></section><section id="impl-FormatTime-for-Uptime" class="impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/time/mod.rs.html#146-151">source</a><a href="#impl-FormatTime-for-Uptime" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.FormatTime.html" title="trait tracing_subscriber::fmt::time::FormatTime">FormatTime</a> for <a class="struct" href="struct.Uptime.html" title="struct tracing_subscriber::fmt::time::Uptime">Uptime</a></h3></section></div><script src="../../../trait.impl/tracing_subscriber/fmt/time/trait.FormatTime.js" data-ignore-extern-crates="std" async></script></section></div></main></body></html>