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<title>std::chrono::operator&lt;&lt;(std::chrono::year_month_day)</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::</span>operator&lt;&lt;<small>(std::chrono::year_month_day)</small></h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-chrono.html">chrono</a>&lrm; | <a href="cpp-chrono-year_month_day.html">year month day</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-chrono.html">&lt;chrono&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br /></span>
<p><a href="cpp-io-basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span><br />
operator<span class="sy1">&lt;&lt;</span><span class="br0">(</span> <a href="cpp-io-basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">year_month_day</span><span class="sy3">&amp;</span> ymd <span class="br0">)</span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<p>&#36755;&#20986; <code>ymd</code> &#30340;&#25991;&#26412;&#34920;&#31034;&#21040;&#27969; <code>os</code> &#20013;&#12290;&#36825;&#39318;&#20808;&#26500;&#25104;&#30001;&#26684;&#24335;&#20026; <code>yyyy-mm-dd</code> &#65288;&#21516; <a href="cpp-chrono-year_month_day-formatter.html"><tt>formatter</tt></a> &#29992;&nbsp;%F &#35828;&#26126;&#31526;&#30340;&#36755;&#20986;&#65289;&#30340;&#26085;&#26399;&#25991;&#26412;&#34920;&#31034;&#32452;&#25104;&#30340; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1228">std::<span class="me2">basic_string</span></span></a><span class="sy1">&lt;</span>CharT<span class="sy1">&gt;</span> s</span></span> &#12290;&#28982;&#21518;&#65292;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span>ymd.<span class="me1">ok</span><span class="br0">(</span><span class="br0">)</span></span></span> &#21017;&#21518;&#38468; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">&quot; is not a valid date&quot;</span></span></span> &#21040; <code>s</code> &#12290;&#25554;&#20837; <code>s</code> &#21040; <code>os</code> &#20013;&#12290;</p>
<p>&#31561;&#20215;&#20110;</p>
<p><span class="t-cc"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> os <span class="sy1">&lt;&lt;</span> <span class="br0">(</span>ymd.<span class="me1">ok</span><span class="br0">(</span><span class="br0">)</span> <span class="sy4">?</span><br />
&nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">format</span><span class="br0">(</span>os.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span>, STATICALLY_WIDEN<span class="sy1">&lt;</span>CharT<span class="sy1">&gt;</span><span class="br0">(</span><span class="st0">&quot;{:%F}&quot;</span><span class="br0">)</span>, ymd<span class="br0">)</span> <span class="sy4">:</span><br />
&nbsp; &nbsp; std<span class="sy4">::</span><span class="me2">format</span><span class="br0">(</span>os.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span>, STATICALLY_WIDEN<span class="sy1">&lt;</span>CharT<span class="sy1">&gt;</span><span class="br0">(</span><span class="st0">&quot;{:%F} is not a valid date&quot;</span><span class="br0">)</span>, ymd<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span></span></span></p>
<p>&#20854;&#20013; <span class="t-c"><span class="mw-geshi cpp source-cpp">STATICALLY_WIDEN<span class="sy1">&lt;</span>CharT<span class="sy1">&gt;</span><span class="br0">(</span><span class="st0">&quot;...&quot;</span><span class="br0">)</span></span></span> &#33509; <code>CharT</code> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> &#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">&quot;...&quot;</span></span></span> &#65292;&#32780;&#33509; <code>CharT</code> &#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">wchar_t</span></span></span> &#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">L<span class="st0">&quot;...&quot;</span></span></span> &#12290;</p>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p><code>os</code> &#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="cpp-utility-format-format.html"><span class="t-lines"><span>format</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#22312;&#26032; string &#20013;&#23384;&#20648;&#21442;&#25968;&#30340;&#26684;&#24335;&#21270;&#34920;&#31034;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div><a href="cpp-chrono-year_month_day-formatter.html"><span class="t-lines"><span>std::formatter<span class="t-dsc-small">&lt;std::chrono::year_month_day&gt;</span></span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td><span class="t-lc">std::formatter</span> &#30340;&#29305;&#21270;&#65292;&#25353;&#29031;&#25552;&#20379;&#30340;&#26684;&#24335;&#26684;&#24335;&#21270; <code>year_month_day</code><br />
<span class="t-mark">(&#31867;&#27169;&#26495;&#29305;&#21270;)</span></td>
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