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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xml:id="function.gmdate" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>gmdate</refname>
<refpurpose>Format a GMT/UTC date/time</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>gmdate</methodname>
<methodparam><type>string</type><parameter>format</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>timestamp</parameter></methodparam>
</methodsynopsis>
<para>
Identical to the <function>date</function> function except that
the time returned is Greenwich Mean Time (GMT).
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>format</parameter></term>
<listitem>
<para>
The format of the outputted date <type>string</type>. See the formatting
options for the <function>date</function> function.
</para>
</listitem>
</varlistentry>
&date.timestamp.description;
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns a formatted date string. If a non-numeric value is used for
<parameter>timestamp</parameter>, &false; is returned and an
<constant>E_WARNING</constant> level error is emitted.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>5.1.0</entry>
<entry>
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).
</entry>
</row>
<row>
<entry>5.1.1</entry>
<entry>
There are useful <link linkend="datetime.constants">constants</link>
of standard date/time formats that can be used to specify the
<parameter>format</parameter> parameter.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>gmdate</function> example</title>
<para>
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".
</para>
<programlisting role="php">
<![CDATA[
<?php
echo date("M d Y H:i:s", mktime(0, 0, 0, 1, 1, 1998));
echo gmdate("M d Y H:i:s", mktime(0, 0, 0, 1, 1, 1998));
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>date</function></member>
<member><function>mktime</function></member>
<member><function>gmmktime</function></member>
<member><function>strftime</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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