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<title>Format a GMT/UTC date/time</title>
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<h1 class="refname">gmdate</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">gmdate</span> — <span class="dc-title">Format a GMT/UTC date/time</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.gmdate-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">string</span> <span class="methodname"><strong>gmdate</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$format</code></span>
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$timestamp</code><span class="initializer"> = time()</span></span>
] )</div>
<p class="para rdfs-comment">
Identical to the <span class="function"><a href="function.date.html" class="function">date()</a></span> function except that
the time returned is Greenwich Mean Time (GMT).
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.gmdate-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">format</code></em></span>
<dd>
<p class="para">
The format of the outputted date <span class="type"><a href="language.types.string.html" class="type string">string</a></span>. See the formatting
options for the <span class="function"><a href="function.date.html" class="function">date()</a></span> function.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">timestamp</code></em></span><dd>
<p class="para">
The optional <em><code class="parameter">timestamp</code></em> parameter is an
<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span> Unix timestamp that defaults to the current
local time if a <em><code class="parameter">timestamp</code></em> is not given. In other
words, it defaults to the value of <span class="function"><a href="function.time.html" class="function">time()</a></span>.
</p></dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.gmdate-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns a formatted date string. If a non-numeric value is used for
<em><code class="parameter">timestamp</code></em>, <strong><code>FALSE</code></strong> is returned and an
<strong><code>E_WARNING</code></strong> level error is emitted.
</p>
</div>
<div class="refsect1 changelog" id="refsect1-function.gmdate-changelog">
<h3 class="title">Changelog</h3>
<p class="para">
<table class="doctable informaltable">
<thead>
<tr>
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>5.1.0</td>
<td>
The valid range of a timestamp is typically from Fri, 13 Dec
1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT. (These are
the dates that correspond to the minimum and maximum values for
a 32-bit signed integer). However, before PHP 5.1.0 this range was limited
from 01-01-1970 to 19-01-2038 on some systems (e.g. Windows).
</td>
</tr>
<tr>
<td>5.1.1</td>
<td>
There are useful <a href="datetime.constants.html" class="link">constants</a>
of standard date/time formats that can be used to specify the
<em><code class="parameter">format</code></em> parameter.
</td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.gmdate-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-2307">
<p><strong>Example #1 <span class="function"><strong>gmdate()</strong></span> example</strong></p>
<div class="example-contents"><p>
When run in Finland (GMT +0200), the first line below prints "Jan 01
1998 00:00:00", while the second prints "Dec 31 1997 22:00:00".
</p></div>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">date</span><span style="color: #007700">(</span><span style="color: #DD0000">"M d Y H:i:s"</span><span style="color: #007700">, </span><span style="color: #0000BB">mktime</span><span style="color: #007700">(</span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">1998</span><span style="color: #007700">));<br />echo </span><span style="color: #0000BB">gmdate</span><span style="color: #007700">(</span><span style="color: #DD0000">"M d Y H:i:s"</span><span style="color: #007700">, </span><span style="color: #0000BB">mktime</span><span style="color: #007700">(</span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">1998</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.gmdate-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.date.html" class="function" rel="rdfs-seeAlso">date()</a> - Format a local time/date</span></li>
<li class="member"> <span class="function"><a href="function.mktime.html" class="function" rel="rdfs-seeAlso">mktime()</a> - Get Unix timestamp for a date</span></li>
<li class="member"> <span class="function"><a href="function.gmmktime.html" class="function" rel="rdfs-seeAlso">gmmktime()</a> - Get Unix timestamp for a GMT date</span></li>
<li class="member"> <span class="function"><a href="function.strftime.html" class="function" rel="rdfs-seeAlso">strftime()</a> - Format a local time/date according to locale settings</span></li>
</ul>
</p>
</div>
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