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92 lines
3.6 KiB
HTML
92 lines
3.6 KiB
HTML
4 years ago
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>mktime (The Red Hat newlib C Library)</title>
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<meta name="description" content="mktime (The Red Hat newlib C Library)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Timefns.html#Timefns" rel="up" title="Timefns">
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<link href="strftime.html#strftime" rel="next" title="strftime">
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<body lang="en">
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<a name="mktime"></a>
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<div class="header">
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<p>
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Next: <a href="strftime.html#strftime" accesskey="n" rel="next">strftime</a>, Previous: <a href="localtime.html#localtime" accesskey="p" rel="prev">localtime</a>, Up: <a href="Timefns.html#Timefns" accesskey="u" rel="up">Timefns</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="mktime_002d_002d_002dconvert-time-to-arithmetic-representation"></a>
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<h3 class="section">8.7 <code>mktime</code>—convert time to arithmetic representation</h3>
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<a name="index-mktime"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <time.h>
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time_t mktime(struct tm *<var>timp</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>mktime</code> assumes the time at <var>timp</var> is a local time, and converts
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its representation from the traditional representation defined by
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<code>struct tm</code> into a representation suitable for arithmetic.
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</p>
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<p><code>localtime</code> is the inverse of <code>mktime</code>.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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If the contents of the structure at <var>timp</var> do not form a valid
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calendar time representation, the result is <code>-1</code>. Otherwise, the
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result is the time, converted to a <code>time_t</code> value.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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ANSI C requires <code>mktime</code>.
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</p>
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<p><code>mktime</code> requires no supporting OS subroutines.
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</p>
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<br>
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</body>
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</html>
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