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| <h3 class="section">8.7 <code>mktime</code>—convert time to arithmetic representation</h3> |
| |
| <p><a name="index-mktime-438"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <time.h> |
| time_t mktime(struct tm *<var>timp</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>mktime</code> assumes the time at <var>timp</var> is a local time, and converts |
| its representation from the traditional representation defined by |
| <code>struct tm</code> into a representation suitable for arithmetic. |
| |
| <p><code>localtime</code> is the inverse of <code>mktime</code>. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| If the contents of the structure at <var>timp</var> do not form a valid |
| calendar time representation, the result is <code>-1</code>. Otherwise, the |
| result is the time, converted to a <code>time_t</code> value. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| ANSI C requires <code>mktime</code>. |
| |
| <p><code>mktime</code> requires no supporting OS subroutines. |
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