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strftime [C++ Reference]
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<h2><a name="strftime" id="strftime">strftime</a></h2>
<div class="level2">
<p>
Syntax:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <ctime></span>
size_t strftime<span class="br0">(</span> <span class="kw4">char</span> <span class="sy0">*</span>str<span class="sy0">,</span> size_t maxsize<span class="sy0">,</span> <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy0">*</span>fmt<span class="sy0">,</span> <span class="kw4">struct</span> tm <span class="sy0">*</span>time <span class="br0">)</span><span class="sy0">;</span></pre>
<p>
The function strftime() formats date and time information from time to a format specified by fmt, then stores the result in str (up to maxsize characters).
</p>
<p>
Certain codes may be used in fmt to specify different types of time:
</p>
<table class="inline">
<tr class="row0">
<th class="col0">Code</th><th class="col1">Meaning</th>
</tr>
<tr class="row1">
<td class="col0"><code>%a</code></td><td class="col1">abbreviated weekday name (e.g. Fri)</td>
</tr>
<tr class="row2">
<td class="col0"><code>%A</code></td><td class="col1">full weekday name (e.g. Friday)</td>
</tr>
<tr class="row3">
<td class="col0"><code>%b</code></td><td class="col1">abbreviated month name (e.g. Oct)</td>
</tr>
<tr class="row4">
<td class="col0"><code>%B</code></td><td class="col1">full month name (e.g. October)</td>
</tr>
<tr class="row5">
<td class="col0"><code>%c</code></td><td class="col1">the standard date and time string</td>
</tr>
<tr class="row6">
<td class="col0"><code>%d</code></td><td class="col1">day of the month, as a number (1-31)</td>
</tr>
<tr class="row7">
<td class="col0"><code>%H</code></td><td class="col1">hour, 24 hour format (00-23)</td>
</tr>
<tr class="row8">
<td class="col0"><code>%I</code></td><td class="col1">hour, 12 hour format (1-12)</td>
</tr>
<tr class="row9">
<td class="col0"><code>%j</code></td><td class="col1">day of the year, as a number (1-366)</td>
</tr>
<tr class="row10">
<td class="col0"><code>%m</code></td><td class="col1">month as a number (1-12). Note: some versions of Microsoft Visual C++ may use values that range from 0-11.</td>
</tr>
<tr class="row11">
<td class="col0"><code>%M</code></td><td class="col1">minute as a number (0-59)</td>
</tr>
<tr class="row12">
<td class="col0"><code>%p</code></td><td class="col1">locale's equivalent of AM or PM</td>
</tr>
<tr class="row13">
<td class="col0"><code>%S</code></td><td class="col1">second as a number (0-59)</td>
</tr>
<tr class="row14">
<td class="col0"><code>%U</code></td><td class="col1">week of the year, (0-53), where week 1 has the first Sunday</td>
</tr>
<tr class="row15">
<td class="col0"><code>%w</code></td><td class="col1">weekday as a decimal (0-6), where Sunday is 0</td>
</tr>
<tr class="row16">
<td class="col0"><code>%W</code></td><td class="col1">week of the year, (0-53), where week 1 has the first Monday</td>
</tr>
<tr class="row17">
<td class="col0"><code>%x</code></td><td class="col1">standard date string</td>
</tr>
<tr class="row18">
<td class="col0"><code>%X</code></td><td class="col1">standard time string</td>
</tr>
<tr class="row19">
<td class="col0"><code>%y</code></td><td class="col1">year in decimal, without the century (0-99)</td>
</tr>
<tr class="row20">
<td class="col0"><code>%Y</code></td><td class="col1">year in decimal, with the century</td>
</tr>
<tr class="row21">
<td class="col0"><code>%Z</code></td><td class="col1">time zone name</td>
</tr>
<tr class="row22">
<td class="col0"><code>%%</code></td><td class="col1">a percent sign</td>
</tr>
</table>
<p>
The strftime() function returns the number of characters put into str, or zero
if an error occurs.
</p>
<p>
Related Topics: <a href="../../c/date/gmtime.html" class="wikilink1" title="c:date:gmtime">gmtime</a>, <a href="../../c/date/localtime.html" class="wikilink1" title="c:date:localtime">localtime</a>, <a href="../../c/date/time.html" class="wikilink1" title="c:date:time">time</a>
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