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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>ctime</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_002_065"> </a>NAME</h4><blockquote>ctime, ctime_r - convert a time value to date and time string</blockquote><h4><a name = "tag_000_002_066"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="time.h.html">time.h</a>>char *ctime(const time_t *<i>clock</i>);char *ctime_r(const time_t *<i>clock</i>, char *<i>buf</i>);</code></pre></blockquote><h4><a name = "tag_000_002_067"> </a>DESCRIPTION</h4><blockquote>The<i>ctime()</i>function converts the time pointed to by<i>clock</i>,representing time in seconds since the Epoch, to local time in the formof a string.It is equivalent to:<pre><code>asctime(localtime(clock))</code></pre><p>The<i><a href="asctime.html">asctime()</a></i>,<i>ctime()</i>,<i><a href="gmtime.html">gmtime()</a></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 informationreturned in either of these objects by any of the otherfunctions.<p>The<i>ctime()</i>interface need not be reentrant.<p>The<i>ctime_r()</i>function converts the calendar time pointed to by<i>clock</i>to local time in exactly the same form as<i>ctime()</i>and puts the string into the array pointed to by<i>buf</i>(which contains at least 26 bytes)and returns<i>buf</i>.<p>Unlike<i>ctime()</i>,the thread-safe version<i>ctime_r()</i>is not required to set<i>tzname</i>.</blockquote><h4><a name = "tag_000_002_068"> </a>RETURN VALUE</h4><blockquote>The<i>ctime()</i>function returns the pointer returned by<i><a href="asctime.html">asctime()</a></i>with that broken-down time as an argument.<p>On successful completion,<i>ctime_r()</i>returns a pointer to the string pointed to by<i>buf</i>.When an error is encountered, a NULL pointer is returned.</blockquote><h4><a name = "tag_000_002_069"> </a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_000_002_070"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_002_071"> </a>APPLICATION USAGE</h4><blockquote>Values for the broken-down time structure can be obtained by calling<i><a href="gmtime.html">gmtime()</a></i>or<i><a href="localtime.html">localtime()</a></i>.This interface is included for compatibility with olderimplementations, and does not support localised date and timeformats.Applications should use the<i><a href="strftime.html">strftime()</a></i>interface to achieve maximum portability.</blockquote><h4><a name = "tag_000_002_072"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_002_073"> </a>SEE ALSO</h4><blockquote><i><a href="asctime.html">asctime()</a></i>,<i><a href="clock.html">clock()</a></i>,<i><a href="difftime.html">difftime()</a></i>,<i><a href="gmtime.html">gmtime()</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>ctime()</i> derived from Issue 1 of the SVID.<P><i>ctime_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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