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<h1 id="firstHeading" class="firstHeading">localtime, localtime_r, localtime_s</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="c.html">c</a>&lrm; | <a href="c-chrono.html">chrono</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;time.h&gt;</code></div>
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<div><span class="mw-geshi c source-c"><span class="kw1">struct</span> <a href="c-chrono-tm.html"><span class="kw522">tm</span></a> <span class="sy2">*</span>localtime &nbsp;<span class="br0">(</span> <span class="kw4">const</span> <a href="c-chrono-time_t.html"><span class="kw523">time_t</span></a> <span class="sy2">*</span>timer <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<div><span class="mw-geshi c source-c"><span class="kw1">struct</span> <a href="c-chrono-tm.html"><span class="kw522">tm</span></a> <span class="sy2">*</span>localtime_r<span class="br0">(</span> <span class="kw4">const</span> <a href="c-chrono-time_t.html"><span class="kw523">time_t</span></a> <span class="sy2">*</span>timer, <span class="kw1">struct</span> <a href="c-chrono-tm.html"><span class="kw522">tm</span></a> <span class="sy2">*</span>buf <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-c23">(C23 &#36215;)</span></td>
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<div><span class="mw-geshi c source-c">error_t &nbsp; &nbsp;localtime_s<span class="br0">(</span> <span class="kw4">const</span> <a href="c-chrono-time_t.html"><span class="kw523">time_t</span></a> <span class="sy2">*</span><span class="kw4">restrict</span> timer, <span class="kw1">struct</span> <a href="c-chrono-tm.html"><span class="kw522">tm</span></a> <span class="sy2">*</span><span class="kw4">restrict</span> buf <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
<td><span class="t-mark-rev t-since-c11">(C11 &#36215;)</span></td>
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<div class="t-li1"><span class="t-li">1)</span> &#36716;&#25442;&#32473;&#23450;&#30340;&#32426;&#20803;&#36215;&#30340;&#26102;&#38388;&#65288; <code>timer</code> &#25152;&#25351;&#21521;&#30340; <span class="t-lc"><a href="c-chrono-time_t.html">time_t</a></span> &#20540;&#65289;&#20026;&#20197; <a href="c-chrono-tm.html"><code>struct tm</code></a> &#26684;&#24335;&#34920;&#36798;&#20026;&#26412;&#22320;&#26102;&#38388;&#30340;&#26085;&#21382;&#26102;&#38388;&#12290;&#23384;&#20648;&#32467;&#26524;&#20110;&#38745;&#24577;&#23384;&#20648;&#20013;&#24182;&#36820;&#22238;&#25351;&#21521;&#35813;&#38745;&#24577;&#23384;&#20648;&#30340;&#25351;&#38024;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#21516; <span class="t-v">(1)</span> &#65292;&#38500;&#20102;&#20989;&#25968;&#23545;&#32467;&#26524;&#20351;&#29992;&#29992;&#25143;&#25552;&#20379;&#30340;&#23384;&#20648; <code>buf</code> &#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#21516; <span class="t-v">(1)</span> &#65292;&#38500;&#20102;&#20989;&#25968;&#23545;&#32467;&#26524;&#20351;&#29992;&#29992;&#25143;&#25552;&#20379;&#30340;&#23384;&#20648; <code>buf</code> &#12290;&#24182;&#19988;&#22312;&#36816;&#34892;&#26102;&#26816;&#27979;&#19979;&#21015;&#38169;&#35823;&#24182;&#35843;&#29992;&#24403;&#21069;&#23433;&#35013;&#30340;<a href="c-error-set_constraint_handler_s.html">&#21046;&#32422;&#22788;&#29702;</a>&#20989;&#25968;&#65306;
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<li><code>timer</code> &#25110; <code>buf</code> &#20026;&#31354;&#25351;&#38024;</li>
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<dd>&#21516;&#25152;&#26377;&#36793;&#30028;&#26816;&#26597;&#20989;&#25968;&#65292; <code>localtime_s</code> &#20165;&#33509;&#23454;&#29616;&#23450;&#20041; <span class="t-c"><span class="mw-geshi c source-c">__STDC_LIB_EXT1__</span></span> &#19988;&#29992;&#25143;&#22312;&#21253;&#21547; <code>time.h</code> &#21069;&#23450;&#20041; <span class="t-c"><span class="mw-geshi c source-c">__STDC_WANT_LIB_EXT1__</span></span> &#20026;&#25972;&#25968;&#24120;&#37327; 1 &#25165;&#20445;&#35777;&#21487;&#29992;&#12290;</dd>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>timer</td>
<td>-</td>
<td>&#25351;&#21521;&#24453;&#36716;&#25442;&#30340; <code>time_t</code> &#23545;&#35937;&#30340;&#25351;&#38024;</td>
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<td>buf</td>
<td>-</td>
<td>&#25351;&#21521;&#24453;&#23384;&#20648;&#32467;&#26524;&#30340; <code>struct tm</code> &#23545;&#35937;&#30340;&#30340;&#25351;&#38024;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<div class="t-li1"><span class="t-li">1)</span> &#25104;&#21151;&#26102;&#20026;&#25351;&#21521;&#38745;&#24577;&#20869;&#37096; <span class="t-lc"><a href="c-chrono-tm.html">tm</a></span> &#23545;&#35937;&#30340;&#25351;&#38024;&#65292;&#21542;&#21017;&#20026;&#31354;&#25351;&#38024;&#12290;&#35813;&#32467;&#26500;&#20307;&#21487;&#33021;&#22312; <span class="t-lc"><a href="c-chrono-gmtime.html">gmtime</a></span> &#12289; <code>localtime</code> &#21450; <span class="t-lc"><a href="c-chrono-ctime.html">ctime</a></span> &#38388;&#20849;&#20139;&#24182;&#21487;&#33021;&#22312;&#27599;&#27425;&#35843;&#29992;&#26102;&#34987;&#37325;&#20889;&#12290;</div>
<div class="t-li1"><span class="t-li">2-3)</span> <code>buf</code> &#25351;&#38024;&#30340;&#21103;&#26412;&#65292;&#25110;&#22312;&#38169;&#35823;&#65288;&#21487;&#33021;&#20026;&#36816;&#34892;&#26102;&#21046;&#32422;&#36829;&#35268;&#25110;&#36716;&#25442;&#25351;&#23450;&#26102;&#38388;&#20026;&#26085;&#21382;&#26102;&#38388;&#22833;&#36133;&#65289;&#26102;&#20026;&#31354;&#25351;&#38024;</div>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#20989;&#25968; <code>localtime</code> &#21487;&#20197;&#19981;&#26159;&#32447;&#31243;&#23433;&#20840;&#30340;&#12290;</p>
<p>POSIX &#35201;&#27714; <code>localtime</code> &#19982; <code>localtime_r</code> &#33509;&#22240;&#20026;&#21442;&#25968;&#36807;&#22823;&#32780;&#22833;&#36133;&#21017;&#35774;&#32622; <span class="t-lc"><a href="c-error-errno.html">errno</a></span> &#20026; <span class="t-lc"><a href="c-error-errno_macros.html">EOVERFLOW</a></span> &#12290;</p>
<p><a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/localtime.html">POSIX &#25351;&#23450;</a> <code>localtime</code> &#19982; <code>localtime_r</code> &#22914;&#21516;&#36890;&#36807;&#35843;&#29992; <a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/tzset.html">tzset</a> &#30830;&#23450;&#26102;&#21306;&#20449;&#24687;&#65292;&#35813;&#20989;&#25968;&#35835;&#21462;&#29615;&#22659;&#21464;&#37327; <span class="t-c"><span class="mw-geshi c source-c">TZ</span></span> &#12290;</p>
<p><a rel="nofollow" class="external text" href="https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/localtime-s-localtime32-s-localtime64-s?view=vs-2019">Microsoft CRT</a> &#20013;&#30340; <code>localtime_s</code> &#23454;&#29616;&#19982; C &#26631;&#20934;&#19981;&#20860;&#23481;&#65292;&#22240;&#20026;&#23427;&#26377;&#30456;&#21453;&#30340;&#21442;&#25968;&#39034;&#24207;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#define __STDC_WANT_LIB_EXT1__ 1</span>
<span class="co2">#include &lt;time.h&gt;</span>
<span class="co2">#include &lt;stdio.h&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="c-chrono-time_t.html"><span class="kw523">time_t</span></a> t <span class="sy1">=</span> <a href="c-chrono-time.html"><span class="kw513">time</span></a><span class="br0">(</span><a href="c-types-NULL.html"><span class="kw103">NULL</span></a><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;UTC: %s&quot;</span>, <a href="c-chrono-asctime.html"><span class="kw515">asctime</span></a><span class="br0">(</span><a href="c-chrono-gmtime.html"><span class="kw519">gmtime</span></a><span class="br0">(</span><span class="sy3">&amp;</span>t<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;local: %s&quot;</span>, <a href="c-chrono-asctime.html"><span class="kw515">asctime</span></a><span class="br0">(</span>localtime<span class="br0">(</span><span class="sy3">&amp;</span>t<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co2">#ifdef __STDC_LIB_EXT1__</span>
<span class="kw1">struct</span> <a href="c-chrono-tm.html"><span class="kw522">tm</span></a> buf<span class="sy4">;</span>
<span class="kw4">char</span> str<span class="br0">[</span><span class="nu0">26</span><span class="br0">]</span><span class="sy4">;</span>
asctime_s<span class="br0">(</span>str,<span class="kw4">sizeof</span> str,gmtime_s<span class="br0">(</span><span class="sy3">&amp;</span>t, <span class="sy3">&amp;</span>buf<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;UTC: %s&quot;</span>, str<span class="br0">)</span><span class="sy4">;</span>
asctime_s<span class="br0">(</span>str,<span class="kw4">sizeof</span> str,localtime_s<span class="br0">(</span><span class="sy3">&amp;</span>t, <span class="sy3">&amp;</span>buf<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;local: %s&quot;</span>, str<span class="br0">)</span><span class="sy4">;</span>
<span class="co2">#endif</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">UTC: Tue Feb 17 18:12:09 2015
local: Tue Feb 17 13:12:09 2015
UTC: Tue Feb 17 18:12:09 2015
local: Tue Feb 17 13:12:09 2015</pre></div>
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<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">&#24341;&#29992;</span></h3>
<div class="t-ref-std-17">
<ul>
<li>C17 &#26631;&#20934;&#65288;ISO/IEC 9899:2018&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.27.3.4 The localtime function (p: 288)</li>
</ul>
</dd>
</dl>
<dl>
<dd>
<ul>
<li>K.3.8.2.4 The localtime_s function (p: 455)</li>
</ul>
</dd>
</dl>
</div>
<div class="t-ref-std-11">
<ul>
<li>C11 &#26631;&#20934;&#65288;ISO/IEC 9899:2011&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.27.3.4 The localtime function (p: 394)</li>
</ul>
</dd>
</dl>
<dl>
<dd>
<ul>
<li>K.3.8.2.4 The localtime_s function (p: 627)</li>
</ul>
</dd>
</dl>
</div>
<div class="t-ref-std-c99">
<ul>
<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.23.3.4 The localtime function (p: 343)</li>
</ul>
</dd>
</dl>
</div>
<div class="t-ref-std-c89">
<ul>
<li>C89/C90 &#26631;&#20934;&#65288;ISO/IEC 9899:1990&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>4.12.3.4 The localtime function</li>
</ul>
</dd>
</dl>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="c-chrono-gmtime.html"><span class="t-lines"><span>gmtime</span><span>gmtime_r</span><span>gmtime_s</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c23">(C23)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div>
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<td>&#23558;&#20174;&#32426;&#20803;&#24320;&#22987;&#30340;&#26102;&#38388;&#36716;&#25442;&#25104;&#20197;&#21327;&#35843;&#19990;&#30028;&#26102;&#65288;UTC&#65289;&#34920;&#31034;&#30340;&#26085;&#21382;&#26102;&#38388;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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