1<html lang="en"> 2<head> 3<title>gmtime - Untitled</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Untitled"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Timefns.html#Timefns" title="Timefns"> 9<link rel="prev" href="difftime.html#difftime" title="difftime"> 10<link rel="next" href="localtime.html#localtime" title="localtime"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<meta http-equiv="Content-Style-Type" content="text/css"> 13<style type="text/css"><!-- 14 pre.display { font-family:inherit } 15 pre.format { font-family:inherit } 16 pre.smalldisplay { font-family:inherit; font-size:smaller } 17 pre.smallformat { font-family:inherit; font-size:smaller } 18 pre.smallexample { font-size:smaller } 19 pre.smalllisp { font-size:smaller } 20 span.sc { font-variant:small-caps } 21 span.roman { font-family:serif; font-weight:normal; } 22 span.sansserif { font-family:sans-serif; font-weight:normal; } 23--></style> 24<link rel="stylesheet" type="text/css" href="../cs.css"> 25</head> 26<body> 27<div class="node"> 28<a name="gmtime"></a> 29<p> 30Next: <a rel="next" accesskey="n" href="localtime.html#localtime">localtime</a>, 31Previous: <a rel="previous" accesskey="p" href="difftime.html#difftime">difftime</a>, 32Up: <a rel="up" accesskey="u" href="Timefns.html#Timefns">Timefns</a> 33<hr> 34</div> 35 36<h3 class="section">8.5 <code>gmtime</code>—convert time to UTC traditional form</h3> 37 38<p><a name="index-gmtime-434"></a><a name="index-gmtime_005fr-435"></a><strong>Synopsis</strong> 39<pre class="example"> #include <time.h> 40 struct tm *gmtime(const time_t *<var>clock</var>); 41 struct tm *gmtime_r(const time_t *<var>clock</var>, struct tm *<var>res</var>); 42 43</pre> 44 <p><strong>Description</strong><br> 45<code>gmtime</code> takes the time at <var>clock</var> representing the number 46of elapsed seconds since 00:00:00 on January 1, 1970, Universal 47Coordinated Time (UTC, also known in some countries as GMT, 48Greenwich Mean time) and converts it to a <code>struct tm</code> 49representation. 50 51 <p><code>gmtime</code> constructs the traditional time representation in static 52storage; each call to <code>gmtime</code> or <code>localtime</code> will overwrite the 53information generated by previous calls to either function. 54 55 <p><br> 56<strong>Returns</strong><br> 57A pointer to the traditional time representation (<code>struct tm</code>). 58 59 <p><br> 60<strong>Portability</strong><br> 61ANSI C requires <code>gmtime</code>. 62 63 <p><code>gmtime</code> requires no supporting OS subroutines. 64 65 <p><br> 66 67 </body></html> 68 69