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| <h3 class="section">8.5 <code>gmtime</code>—convert time to UTC traditional form</h3> |
| |
| <p><a name="index-gmtime-434"></a><a name="index-gmtime_005fr-435"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <time.h> |
| 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> |
| <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><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> |
| <strong>Returns</strong><br> |
| A pointer to the traditional time representation (<code>struct tm</code>). |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| ANSI C requires <code>gmtime</code>. |
| |
| <p><code>gmtime</code> requires no supporting OS subroutines. |
| |
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