php-doc-en/reference/datetime/functions/gmstrftime.xml

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<refentry xml:id="function.gmstrftime" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>gmstrftime</refname>
  <refpurpose>Format a GMT/UTC time/date according to locale settings</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>string</type><type>false</type></type><methodname>gmstrftime</methodname>
   <methodparam><type>string</type><parameter>format</parameter></methodparam>
   <methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>timestamp</parameter><initializer>&null;</initializer></methodparam>
  </methodsynopsis>
  <para>
   Behaves the same as <function>strftime</function> except that the
   time returned is Greenwich Mean Time (GMT). For example, when run
   in Eastern Standard Time (GMT -0500), the first line below prints
   "Dec 31 1998 20:00:00", while the second prints "Jan 01 1999
   01:00:00".
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>format</parameter></term>
     <listitem>
      <para>
       See description in <function>strftime</function>.
      </para>
     </listitem>
    </varlistentry>
    &date.timestamp.description;
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns a string formatted according to the given format string
   using the given <parameter>timestamp</parameter> or the current
   local time if no timestamp is given.  Month and weekday names and
   other language dependent strings respect the current locale set
   with <function>setlocale</function>.
   On failure, &false; is returned.
  </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>8.0.0</entry>
       <entry>
        <parameter>timestamp</parameter> is nullable now.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>gmstrftime</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
setlocale(LC_TIME, 'en_US');
echo strftime("%b %d %Y %H:%M:%S", mktime(20, 0, 0, 12, 31, 98)) . "\n";
echo gmstrftime("%b %d %Y %H:%M:%S", mktime(20, 0, 0, 12, 31, 98)) . "\n";
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>strftime</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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