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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="../index-2.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 <ctime>
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>
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