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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <meta name="generator" content= "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org"> <title>strftime</title> <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table> <tr> <td> <div class="body-content"> <div class="header-box"> <a href="../index.html">cppreference.com</a> > <a href= "index.html">Standard C Date & Time</a> > <a href= "strftime.html">strftime</a> </div> <div class="name-format"> strftime </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <time.h> size_t strftime( char *str, size_t maxsize, const char *fmt, struct tm *time );</pre> <p>The function strftime() formats date and time information from <em>time</em> to a format specified by <em>fmt</em>, then stores the result in <em>str</em> (up to <em>maxsize</em> characters). Certain codes may be used in <em>fmt</em> to specify different types of time:</p> <table class="code-table"> <tr> <th class="code-table-th">Code</th> <th class="code-table-th">Meaning</th> </tr> <tr> <td class="code-table-td">%a</td> <td class="code-table-td">abbreviated weekday name (e.g. Fri)</td> </tr> <tr> <td class="code-table-td">%A</td> <td class="code-table-td">full weekday name (e.g. Friday)</td> </tr> <tr> <td class="code-table-td">%b</td> <td class="code-table-td">abbreviated month name (e.g. Oct)</td> </tr> <tr> <td class="code-table-td">%B</td> <td class="code-table-td">full month name (e.g. October)</td> </tr> <tr> <td class="code-table-td">%c</td> <td class="code-table-td">the standard date and time string</td> </tr> <tr> <td class="code-table-td">%d</td> <td class="code-table-td">day of the month, as a number (1-31)</td> </tr> <tr> <td class="code-table-td">%H</td> <td class="code-table-td">hour, 24 hour format (0-23)</td> </tr> <tr> <td class="code-table-td">%I</td> <td class="code-table-td">hour, 12 hour format (1-12)</td> </tr> <tr> <td class="code-table-td">%j</td> <td class="code-table-td">day of the year, as a number (1-366)</td> </tr> <tr> <td class="code-table-td">%m</td> <td class="code-table-td">month as a number (1-12). Note: some versions of Microsoft Visual C++ may use values that range from 0-11.</td> </tr> <tr> <td class="code-table-td">%M</td> <td class="code-table-td">minute as a number (0-59)</td> </tr> <tr> <td class="code-table-td">%p</td> <td class="code-table-td">locale's equivalent of AM or PM</td> </tr> <tr> <td class="code-table-td">%S</td> <td class="code-table-td">second as a number (0-59)</td> </tr> <tr> <td class="code-table-td">%U</td> <td class="code-table-td">week of the year, (0-53), where week 1 has the first Sunday</td> </tr> <tr> <td class="code-table-td">%w</td> <td class="code-table-td">weekday as a decimal (0-6), where Sunday is 0</td> </tr> <tr> <td class="code-table-td">%W</td> <td class="code-table-td">week of the year, (0-53), where week 1 has the first Monday</td> </tr> <tr> <td class="code-table-td">%x</td> <td class="code-table-td">standard date string</td> </tr> <tr> <td class="code-table-td">%X</td> <td class="code-table-td">standard time string</td> </tr> <tr> <td class="code-table-td">%y</td> <td class="code-table-td">year in decimal, without the century (0-99)</td> </tr> <tr> <td class="code-table-td">%Y</td> <td class="code-table-td">year in decimal, with the century</td> </tr> <tr> <td class="code-table-td">%Z</td> <td class="code-table-td">time zone name</td> </tr> <tr> <td class="code-table-td">%%</td> <td class="code-table-td">a percent sign</td> </tr> </table> <p>The strftime() function returns the number of characters put into <em>str</em>, or zero if an error occurs.</p> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="gmtime.html">gmtime</a><br> <a href="localtime.html">localtime</a><br> <a href="time.html">time</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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