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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 > < script > if ( window . location . protocol !== "file:" ) document . write ( ` <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"> ` ) < / script > < link rel = "stylesheet" href = "../../../static.files/normalize-76eba96aa4d2e634.css" > < link rel = "stylesheet" href = "../../../static.files/rustdoc-e935ef01ae1c1829.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 = "1.78.0 (9b00956e5 2024-04-29)" data-channel = "1.78.0" data-search-js = "search-42d8da7a6b9792c2.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-12cf3b4f4f9dc36d.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" > & ' 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(_: & mut Writer< ' _> ) -> 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 >
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< 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 ‘ ’ ‘ ’ 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 > − < / span > ]< / button > < / span > < / div > < pre class = "rust item-decl" > < code > pub trait FormatTime {
// Required method
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fn < a href = "#tymethod.format_time" class = "fn" > format_time< / a > (& self, w: & mut < a class = "struct" href = "../format/struct.Writer.html" title = "struct tracing_subscriber::fmt::format::Writer" > Writer< / a > < '_> ) -> < a class = "type" href = "https://doc.rust-lang.org/1.78.0/core/fmt/type.Result.html" title = "type core::fmt::Result" > Result< / a > ;
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}< / 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 >
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< / 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 > (& self, w: & mut < a class = "struct" href = "../format/struct.Writer.html" title = "struct tracing_subscriber::fmt::format::Writer" > Writer< / a > < '_> ) -> < a class = "type" href = "https://doc.rust-lang.org/1.78.0/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 >
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< 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 >
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< / 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/1.78.0/std/primitive.fn.html" > fn< / a > (_: & mut < a class = "struct" href = "../format/struct.Writer.html" title = "struct tracing_subscriber::fmt::format::Writer" > Writer< / a > < '_> ) -> < a class = "type" href = "https://doc.rust-lang.org/1.78.0/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 > (& self, w: & mut < a class = "struct" href = "../format/struct.Writer.html" title = "struct tracing_subscriber::fmt::format::Writer" > Writer< / a > < '_> ) -> < a class = "type" href = "https://doc.rust-lang.org/1.78.0/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/1.78.0/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 > (& self, _: & mut < a class = "struct" href = "../format/struct.Writer.html" title = "struct tracing_subscriber::fmt::format::Writer" > Writer< / a > < '_> ) -> < a class = "type" href = "https://doc.rust-lang.org/1.78.0/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< 'a, F> < 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/1.78.0/std/primitive.reference.html" > & '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 > (& self, w: & mut < a class = "struct" href = "../format/struct.Writer.html" title = "struct tracing_subscriber::fmt::format::Writer" > Writer< / a > < '_> ) -> < a class = "type" href = "https://doc.rust-lang.org/1.78.0/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 >
