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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN"><!-- This collection of hypertext pages is Copyright 1995-2005 by Steve Summit. --><!-- Content from the book "C Programming FAQs: Frequently Asked Questions" --><!-- (Addison-Wesley, 1995, ISBN 0-201-84519-9) is made available here by --><!-- permission of the author and the publisher as a service to the community. --><!-- It is intended to complement the use of the published text --><!-- and is protected by international copyright laws. --><!-- The on-line content may be accessed freely for personal use --><!-- but may not be published or retransmitted without explicit permission. --><!-- --><!-- this page built Sat Dec 24 21:47:46 2005 by faqproc version 2.7 --><!-- from source file libdatetime.sgml dated Wed Dec 21 12:57:15 2005 --><!-- corresponding to FAQ list version 4.0 --><html><!-- Mirrored from c-faq.com/lib/curtime.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:59 GMT --><head><meta name=GENERATOR content="faqproc"><title>Question 13.12</title><link href="extsort.html" rev=precedes><link href="mktime.html" rel=precedes><link href="index.html" rev=subdocument></head><body bgcolor="#ffffff"><a href="extsort.html" rev=precedes><img src="../images/buttonleft.gif" alt="prev"></a><a href="index.html" rev=subdocument><img src="../images/buttonup.gif" alt="up"></a><a href="mktime.html" rel=precedes><img src="../images/buttonright.gif" alt="next"></a> <a href="../index-2.html"><img src="../images/buttontop.gif" alt="top/contents"></a><a href="../search.html"><img src="../images/buttonsrch.gif" alt="search"></a><hr><p><!-- qbegin --><h1>comp.lang.c FAQ list<font color=blue>·</font><!-- qtag -->Question 13.12</h1><p><font face=Helvetica size=8 color=blue><b>Q:</b></font>How can I get thecurrent dateortime of day in a C program?</p><p><hr><p><font face=Helvetica size=8 color=blue><b>A:</b></font>Just use the <TT>time</TT>,<TT>ctime</TT>,<TT>localtime</TT>and/or <TT>strftime</TT>functions.Here is a simple example:<a href="timefail.html" rel=subdocument>[footnote]</a><pre>#include <stdio.h>#include <time.h>int main(){ time_t now; time(&now); printf("It's %s", ctime(&now)); return 0;}</pre></p><p>Calls to <TT>localtime</TT> and <TT>strftime</TT>look like this:<pre> struct tm *tmp = localtime(&now); char fmtbuf[30]; printf("It's %d:%02d:%02d\n", tmp->tm_hour, tmp->tm_min, tmp->tm_sec); strftime(fmtbuf, sizeof fmtbuf, "%A, %B %d, %Y", tmp); printf("on %s\n", fmtbuf);</pre>(Note that these functions take a <em>pointer</em>to the <TT>time_t</TT> variable,even when they will not be modifying it.<a href="prelong.html" rel=subdocument>[footnote]</a>)</p><p>If you need sub-second resolution,see question <a href="../osdep/subsecond.html">19.37</a>.</p><p>References:K&R2 Sec. B10 pp. 255-7<br>ISO Sec. 7.12<br>H&S Sec. 18<br></p><!-- aend --><p><hr><a href="extsort.html" rev=precedes><img src="../images/buttonleft.gif" alt="prev"></a><a href="index.html" rev=subdocument><img src="../images/buttonup.gif" alt="up"></a><a href="mktime.html" rel=precedes><img src="../images/buttonright.gif" alt="next"></a> <a href="../questions.html"><img src="../images/buttontop.gif" alt="contents"></a><a href="../search.html"><img src="../images/buttonsrch.gif" alt="search"></a><br><!-- lastfooter --><a href="../about.html">about this FAQ list</a> <a href="../eskimo.html">about eskimo</a> <a href="../search.html">search</a> <a href="../feedback.html">feedback</a> <a href="copyright.html">copyright</a><p>Hosted by<a href="http://www.eskimo.com/"><img src="../../www.eskimo.com/img/link/eskitiny.gif" alt="Eskimo North"></a></body><!-- Mirrored from c-faq.com/lib/curtime.html by HTTrack Website Copier/3.x [XR&CO'2008], Sat, 14 Mar 2009 07:58:59 GMT --></html>⌨️ 快捷键说明
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