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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>gmtime</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_005_857"> </a>NAME</h4><blockquote>gmtime, gmtime_r - convert a time value to a broken-down UTC time</blockquote><h4><a name = "tag_000_005_858"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="time.h.html">time.h</a>>struct tm *gmtime(const time_t *<i>timer</i>);struct tm *gmtime_r(const time_t *<i>clock</i>, struct tm *<i>result</i>);</code></pre></blockquote><h4><a name = "tag_000_005_859"> </a>DESCRIPTION</h4><blockquote>The<i>gmtime()</i>function converts the time in seconds since the Epoch pointed to by<i>timer</i>into a broken-down time, expressed as Coordinated Universal Time (UTC).<p>The<i>gmtime()</i>interface need not be reentrant.<p>The<i>gmtime_r()</i>function converts the calendar time pointed to by<i>clock</i>into a broken-down time expressed as Coordinated Universal Time (UTC).The broken-down time is stored in the structure referred to by<i>result</i>.The<i>gmtime_r()</i>function also returns the address of the same structure.</blockquote><h4><a name = "tag_000_005_860"> </a>RETURN VALUE</h4><blockquote>The<i>gmtime()</i>function returns a pointer to a<b>struct tm</b>.<p>Upon successful completion,<i>gmtime_r()</i>returns the address of the structure pointed to by the argument<i>result</i>.If an error is detected, or UTC is not available,<i>gmtime_r()</i>returns a NULL pointer.</blockquote><h4><a name = "tag_000_005_861"> </a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_000_005_862"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_863"> </a>APPLICATION USAGE</h4><blockquote>The<i><a href="asctime.html">asctime()</a></i>,<i><a href="ctime.html">ctime()</a></i>,<i>gmtime()</i>and<i><a href="localtime.html">localtime()</a></i>functions return values in one of two static objects: abroken-down time structure and an array of<b>char</b>.Execution of any of the functions may overwrite the information returned ineither of these objects by any of the other functions.</blockquote><h4><a name = "tag_000_005_864"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_865"> </a>SEE ALSO</h4><blockquote><i><a href="asctime.html">asctime()</a></i>,<i><a href="clock.html">clock()</a></i>,<i><a href="ctime.html">ctime()</a></i>,<i><a href="difftime.html">difftime()</a></i>,<i><a href="localtime.html">localtime()</a></i>,<i><a href="mktime.html">mktime()</a></i>,<i><a href="strftime.html">strftime()</a></i>,<i><a href="strptime.html">strptime()</a></i>,<i><a href="time.html">time()</a></i>,<i><a href="utime.html">utime()</a></i>,<i><a href="time.h.html"><time.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote><i>gmtime()</i> derived from Issue 1 of the SVID.<P><i>gmtime_r()</i> derived from the POSIX Threads Extension (1003.1c-1995).</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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