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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/any.html" title="cpp/utility/any"><span class="t-lines"><span>any</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/variant.html" title="cpp/utility/variant"><span class="t-lines"><span>variant</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/optional/in_place.html" title="cpp/utility/in place"><span class="t-lines"><span>in_place</span><span>in_place_type</span><span>in_place_index</span><span>in_place_t</span><span>in_place_type_t</span><span>in_place_index_t</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Pairs and tuples</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/pair.html" title="cpp/utility/pair"><span class="t-lines"><span>pair</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/tuple.html" title="cpp/utility/tuple"><span class="t-lines"><span>tuple</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/apply.html" title="cpp/utility/apply"><span class="t-lines"><span>apply</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/make_from_tuple.html" title="cpp/utility/make from tuple"><span class="t-lines"><span>make_from_tuple</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/piecewise_construct_t.html" title="cpp/utility/piecewise construct t"><span class="t-lines"><span>piecewise_construct_t</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/piecewise_construct.html" title="cpp/utility/piecewise construct"><span class="t-lines"><span>piecewise_construct</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
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<tr class="t-nv-h2"><td colspan="5"> Swap, forward and move</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../algorithm/swap.html" title="cpp/algorithm/swap"><span class="t-lines"><span>swap</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/exchange.html" title="cpp/utility/exchange"><span class="t-lines"><span>exchange</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/forward.html" title="cpp/utility/forward"><span class="t-lines"><span>forward</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/move.html" title="cpp/utility/move"><span class="t-lines"><span>move</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/move_if_noexcept.html" title="cpp/utility/move if noexcept"><span class="t-lines"><span>move_if_noexcept</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Elementary string conversions</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/to_chars.html" title="cpp/utility/to chars"><span class="t-lines"><span>to_chars</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/from_chars.html" title="cpp/utility/from chars"><span class="t-lines"><span>from_chars</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/chars_format.html" title="cpp/utility/chars format"><span class="t-lines"><span>chars_format</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Type operations</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/declval.html" title="cpp/utility/declval"><span class="t-lines"><span>declval</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../../utility/as_const.html" title="cpp/utility/as const"><span class="t-lines"><span>as_const</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/utility/navbar_content&amp;action=edit">&#91;edit&#93;</a></span></div></div></div></div><div class="t-navbar-sep">&#160;</div><div class="t-navbar-head"><a href="../../chrono.html" title="cpp/chrono">Date and time utilities</a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../time_point.html" title="cpp/chrono/time point"><span class="t-lines"><span>time_point</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../duration.html" title="cpp/chrono/duration"><span class="t-lines"><span>duration</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../system_clock.html" title="cpp/chrono/system clock"><span class="t-lines"><span>system_clock</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../steady_clock.html" title="cpp/chrono/steady clock"><span class="t-lines"><span>steady_clock</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../high_resolution_clock.html" title="cpp/chrono/high resolution clock"><span class="t-lines"><span>high_resolution_clock</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"> <a href="../c.html" title="cpp/chrono/c"> C-style date and time</a></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/navbar_content&amp;action=edit">&#91;edit&#93;</a></span></div></div></div></div><div class="t-navbar-sep">&#160;</div><div class="t-navbar-head"><a href="../c.html" title="cpp/chrono/c">C-style date and time utilities</a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5"> Functions</td></tr>
<tr class="t-nv-h2"><td colspan="5"> Time manipulation</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="difftime.html" title="cpp/chrono/c/difftime"><span class="t-lines"><span>difftime</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="time.html" title="cpp/chrono/c/time"><span class="t-lines"><span>time</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="clock.html" title="cpp/chrono/c/clock"><span class="t-lines"><span>clock</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="timespec_get.html" title="cpp/chrono/c/timespec get"><span class="t-lines"><span>timespec_get</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Format conversions</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="asctime.html" title="cpp/chrono/c/asctime"><span class="t-lines"><span>asctime</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="ctime.html" title="cpp/chrono/c/ctime"><span class="t-lines"><span>ctime</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="strftime.html" title="cpp/chrono/c/strftime"><span class="t-lines"><span>strftime</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="wcsftime.html" title="cpp/chrono/c/wcsftime"><span class="t-lines"><span>wcsftime</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="gmtime.html" title="cpp/chrono/c/gmtime"><span class="t-lines"><span>gmtime</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="localtime.html" title="cpp/chrono/c/localtime"><span class="t-lines"><span>localtime</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>mktime</span></span></strong></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Constants</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="CLOCKS_PER_SEC.html" title="cpp/chrono/c/CLOCKS PER SEC"><span class="t-lines"><span>CLOCKS_PER_SEC</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Types</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="tm.html" title="cpp/chrono/c/tm"><span class="t-lines"><span>tm</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="time_t.html" title="cpp/chrono/c/time t"><span class="t-lines"><span>time_t</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="clock_t.html" title="cpp/chrono/c/clock t"><span class="t-lines"><span>clock_t</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="timespec.html" title="cpp/chrono/c/timespec"><span class="t-lines"><span>timespec</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/c/navbar_content&amp;action=edit">&#91;edit&#93;</a></span></div></div></div></div><div class="t-navbar-sep">&#160;</div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dsc-header">
<td> <div>Defined in header <code><a href="../../header/ctime.html" title="cpp/header/ctime">&lt;ctime&gt;</a></code>
 </div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><a href="time_t.html"><span class="kw1023">std::<span class="me2">time_t</span></span></a> mktime<span class="br0">&#40;</span> <a href="tm.html"><span class="kw1022">std::<span class="me2">tm</span></span></a><span class="sy2">*</span> time <span class="br0">&#41;</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>Converts local calendar time to a time since epoch as a <span class="t-c"><span class="mw-geshi cpp source-cpp">time_t</span></span> object. <code>time-&gt;tm_wday</code> and <code>time-&gt;tm_yday</code> are ignored. The values in <code>time</code> are permitted to be outside their normal ranges.
</p><p>A negative value of <code>time-&gt;tm_isdst</code> causes <code>mktime</code> to attempt to determine if Daylight Saving Time was in effect.
</p><p>If the conversion is successful, the <code>time</code> object is modified. All fields of <code>time</code> are updated to fit their proper ranges. <code>time-&gt;tm_wday</code> and <code>time-&gt;tm_yday</code> are recalculated using information available in other fields.
</p>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="mktime.html#Parameters"><span class="tocnumber">1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="mktime.html#Return_value"><span class="tocnumber">2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="mktime.html#Notes"><span class="tocnumber">3</span> <span class="toctext">Notes</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="mktime.html#Example"><span class="tocnumber">4</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="mktime.html#See_also"><span class="tocnumber">5</span> <span class="toctext">See also</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/chrono/c/mktime&amp;action=edit&amp;section=1" title="Edit section: Parameters">edit</a>]</span> <span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  time
</td>
<td> -
</td>
<td>  pointer to a <span class="t-lc"><a href="tm.html" title="cpp/chrono/c/tm">std::tm</a></span> object specifying local calendar time to convert
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/chrono/c/mktime&amp;action=edit&amp;section=2" title="Edit section: Return value">edit</a>]</span> <span class="mw-headline" id="Return_value">Return value</span></h3>
<p>Time since epoch as a <span class="t-lc"><a href="time_t.html" title="cpp/chrono/c/time t">std::time_t</a></span> object on success or <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">-</span><span class="nu0">1</span></span></span> if <code>time</code> cannot be represented as a <span class="t-lc"><a href="time_t.html" title="cpp/chrono/c/time t">std::time_t</a></span> object.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/chrono/c/mktime&amp;action=edit&amp;section=3" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3>
<p>If the <span class="t-lc"><a href="tm.html" title="cpp/chrono/c/tm">std::tm</a></span> object was obtained from <span class="t-lc"><a href="../../io/manip/get_time.html" title="cpp/io/manip/get time">std::get_time</a></span> or the POSIX <a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/009695399/functions/strptime.html">strptime</a>, the value of <code>tm_isdst</code> is indeterminate, and needs to be set explicitly before calling <code>mktime</code>.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/chrono/c/mktime&amp;action=edit&amp;section=4" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><p> Display the time 100 months ago. 
 </p><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iomanip&gt;</span>
<span class="co2">#include &lt;ctime&gt;</span>
<span class="co2">#include &lt;stdlib.h&gt;</span>
&#160;
<span class="kw4">int</span> main<span class="br0">&#40;</span><span class="br0">&#41;</span>
<span class="br0">&#123;</span>
    setenv<span class="br0">&#40;</span><span class="st0">&quot;TZ&quot;</span>, <span class="st0">&quot;/usr/share/zoneinfo/America/New_York&quot;</span>, <span class="nu0">1</span><span class="br0">&#41;</span><span class="sy4">;</span> <span class="co1">// POSIX-specific</span>
&#160;
    <a href="time_t.html"><span class="kw1023">std::<span class="me2">time_t</span></span></a> t <span class="sy1">=</span> <a href="time.html"><span class="kw1011">std::<span class="me2">time</span></span></a><span class="br0">&#40;</span><a href="../../types/NULL.html"><span class="kw103">NULL</span></a><span class="br0">&#41;</span><span class="sy4">;</span>
    <a href="tm.html"><span class="kw1022">std::<span class="me2">tm</span></span></a> tm <span class="sy1">=</span> <span class="sy2">*</span><a href="localtime.html"><span class="kw1020">std::<span class="me2">localtime</span></span></a><span class="br0">&#40;</span><span class="sy3">&amp;</span>t<span class="br0">&#41;</span><span class="sy4">;</span>
    <a href="../../io/cout.html"><span class="kw1754">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;Today is           &quot;</span> <span class="sy1">&lt;&lt;</span> <a href="../../io/manip/put_time.html"><span class="kw1797">std::<span class="me2">put_time</span></span></a><span class="br0">&#40;</span><span class="sy3">&amp;</span>tm, <span class="st0">&quot;%c&#160;%Z&quot;</span><span class="br0">&#41;</span>
              <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; and DST is &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="br0">&#40;</span>tm.<span class="me1">tm_isdst</span> <span class="sy4">?</span> <span class="st0">&quot;in effect&quot;</span> <span class="sy4">:</span> <span class="st0">&quot;not in effect&quot;</span><span class="br0">&#41;</span> <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
    tm.<span class="me1">tm_mon</span> <span class="sy2">-</span><span class="sy1">=</span> <span class="nu0">100</span><span class="sy4">;</span>  <span class="co1">// tm_mon is now outside its normal range</span>
    std<span class="sy4">::</span><span class="me2">mktime</span><span class="br0">&#40;</span><span class="sy3">&amp;</span>tm<span class="br0">&#41;</span><span class="sy4">;</span>  <span class="co1">// tm_dst is not set to -1; today's DST status is used</span>
    <a href="../../io/cout.html"><span class="kw1754">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;100 months ago was &quot;</span> <span class="sy1">&lt;&lt;</span> <a href="../../io/manip/put_time.html"><span class="kw1797">std::<span class="me2">put_time</span></span></a><span class="br0">&#40;</span><span class="sy3">&amp;</span>tm, <span class="st0">&quot;%c&#160;%Z&quot;</span><span class="br0">&#41;</span>
              <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; and DST was &quot;</span> <span class="sy1">&lt;&lt;</span> <span class="br0">&#40;</span>tm.<span class="me1">tm_isdst</span> <span class="sy4">?</span> <span class="st0">&quot;in effect&quot;</span> <span class="sy4">:</span> <span class="st0">&quot;not in effect&quot;</span><span class="br0">&#41;</span> <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
<span class="br0">&#125;</span></pre></div></div>
<p>Output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">Today is           Fri Apr 22 11:40:36 2016 EDT and DST is in effect
100 months ago was Sat Dec 22 10:40:36 2007 EST and DST was not in effect</pre></div></div> 
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<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/chrono/c/mktime&amp;action=edit&amp;section=5" title="Edit section: See also">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="localtime.html" title="cpp/chrono/c/localtime"> <span class="t-lines"><span>localtime</span></span></a></div></div>
</td>
<td>   converts time since epoch to calendar time expressed as local time <br /> <span class="t-mark">(function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/chrono/c/dsc_localtime&amp;action=edit">&#91;edit&#93;</a></span>
</td></tr>

<tr class="t-dsc">
<td colspan="2"> <div class="t-dsc-see"><span><a href="../../../c/chrono/mktime.html" title="c/chrono/mktime">C documentation</a></span> for <span class="t-dsc-see-tt"><span>mktime</span></span></div>
</td></tr>

</table>

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