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<body lang=ZH-CN link=blue vlink=blue style='tab-interval:21.0pt;text-justify-trim:
punctuation'>
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<td style='padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span lang=EN-US><a href="index.html">cppreference.com</a>
-> <a href="stddate.html"><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>标准</span>c<span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>时间与日期函数</span></a> -> </span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>详解</span>
<span lang=EN-US style='font-size:12.0pt;font-family:宋体'><o:p></o:p></span></p>
</td>
</tr>
</table>
<h1>标准<span lang=EN-US>c时间与日期函数</span></h1>
<div class=MsoNormal align=center style='text-align:center'><span lang=EN-US>
<hr size=2 width="100%" align=center>
</span></div>
<h2><span lang=EN-US><a name="asctime">asctime</a> </span></h2>
<p class=MsoNormal><i><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>语法</span><span lang=EN-US>:</span></i><span
lang=EN-US> </span></p>
<table border=0 cellpadding=0 bgcolor="#ccccff" style='mso-cellspacing:1.5pt;
background:#CCCCFF;mso-padding-alt:0cm 0cm 0cm 0cm'>
<tr>
<td style='padding:.75pt .75pt .75pt .75pt'><pre><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>#include <time.h></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>char *asctime( const struct tm *ptr );</span></pre></td>
</tr>
</table>
<p>功能： 函数将<i><span lang=EN-US>ptr</span></i>所指向的时间结构转换成下列字符串： </p>
<pre><span lang=EN-US><span style="mso-spacerun: yes"> </span>day month date hours:minutes:seconds year\n\0</span></pre>
<p style='tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'>例如<span
lang=EN-US>: </span></p>
<pre><span lang=EN-US><span style="mso-spacerun: yes"> </span>Mon Jun 26 12:03:53 2000</span></pre>
<p class=MsoNormal style='tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><i><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>相关主题</span><span lang=EN-US>:</span></i><span lang=EN-US><br>
<strong><a href="#localtime">localtime()</a>, <a href="#gmtime">gmtime()</a>, <a
href="#time">time()</a>, and <a href="#ctime">ctime()</a>. </strong></span></p>
<div class=MsoNormal align=center style='text-align:center;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><span
lang=EN-US>
<hr size=2 width="100%" align=center>
</span></div>
<h2 style='tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><span
lang=EN-US><a name="clock">clock</a> </span></h2>
<p class=MsoNormal style='tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><i><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>语法</span><span lang=EN-US>:</span></i><span lang=EN-US> </span></p>
<table border=0 cellpadding=0 bgcolor="#ccccff" style='mso-cellspacing:1.5pt;
background:#CCCCFF;mso-padding-alt:0cm 0cm 0cm 0cm'>
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<td style='padding:.75pt .75pt .75pt .75pt'><pre><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>#include <time.h></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>clock_t clock( void );</span></pre></td>
</tr>
</table>
<p style='tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'>功能：
函数返回自程序开始运行的处理器时间，如果无可用信息，返回<span lang=EN-US>-1。 转换返回值以秒记, 返回值除以CLOCKS_PER_SECOND.
(注: 如果编译器是POSIX兼容的, CLOCKS_PER_SECOND定义为1000000.) </span></p>
<p class=MsoNormal style='tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><i><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>相关主题</span><span lang=EN-US>:</span></i><span lang=EN-US><br>
<strong><a href="#time">time()</a>, <a href="#asctime">asctime()</a>, and <a
href="#ctime">ctime()</a>. </strong></span></p>
<div class=MsoNormal align=center style='text-align:center;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><span
lang=EN-US>
<hr size=2 width="100%" align=center>
</span></div>
<h2 style='tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><span
lang=EN-US><a name="ctime">ctime</a> </span></h2>
<p class=MsoNormal style='tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><i><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>语法</span><span lang=EN-US>:</span></i><span lang=EN-US> </span></p>
<table border=0 cellpadding=0 bgcolor="#ccccff" style='mso-cellspacing:1.5pt;
background:#CCCCFF;mso-padding-alt:0cm 0cm 0cm 0cm'>
<tr>
<td style='padding:.75pt .75pt .75pt .75pt'><pre><span lang=EN-US><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>#include <time.h></span></pre><pre><span
lang=EN-US><span style="mso-spacerun: yes"> </span>char *ctime( const time_t *time );</span></pre></td>
</tr>
</table>
<p style='tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'>功能：
函数转换参数<i><span lang=EN-US>time</span></i>为本地时间格式：</p>
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