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<a name="gmtime_002d_002d_002dconvert-time-to-UTC-traditional-form"></a>
<h3 class="section">8.5 <code>gmtime</code>&mdash;convert time to UTC traditional form</h3>
<a name="index-gmtime"></a>
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<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;time.h&gt;
struct tm *gmtime(const time_t *<var>clock</var>);
struct tm *gmtime_r(const time_t *<var>clock</var>, struct tm *<var>res</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>gmtime</code> takes the time at <var>clock</var> representing the number
of elapsed seconds since 00:00:00 on January 1, 1970, Universal
Coordinated Time (UTC, also known in some countries as GMT,
Greenwich Mean time) and converts it to a <code>struct tm</code>
representation.
</p>
<p><code>gmtime</code> constructs the traditional time representation in static
storage; each call to <code>gmtime</code> or <code>localtime</code> will overwrite the
information generated by previous calls to either function.
</p>
<br>
<p><strong>Returns</strong><br>
A pointer to the traditional time representation (<code>struct tm</code>).
</p>
<br>
<p><strong>Portability</strong><br>
ANSI C requires <code>gmtime</code>.
</p>
<p><code>gmtime</code> requires no supporting OS subroutines.
</p>
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