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<refentry xml:id="function.timezone-offset-get" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>timezone_offset_get</refname>
  <refpurpose>Returns the timezone offset from GMT</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>timezone_offset_get</methodname>
   <methodparam><type>DateTimeZone</type><parameter>object</parameter></methodparam>
   <methodparam><type>DateTime</type><parameter>datetime</parameter></methodparam>
  </methodsynopsis>
  <methodsynopsis>
   <type>int</type><methodname>DateTimeZone::getOffset</methodname>
   <methodparam><type>DateTime</type><parameter>datetime</parameter></methodparam>
  </methodsynopsis>
  <para>
   This function returns the offset to GMT for the date/time specified in the
   <parameter>datetime</parameter> parameter. The GMT offset is calculated
   with the timezone information contained in the DateTime object being used.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>object</parameter></term>
     <listitem>
      <para>
       DateTimeZone object.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>datetime</parameter></term>
     <listitem>
      <para>
       DateTime that contains the date/time to compute the offset from. 
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns time zone offset in seconds on success or &false; on failure.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>timezone_offset_get</function> examples</title>
    <programlisting role="php">
<![CDATA[
<?php
// Create two timezone objects, one for Taipei (Taiwan) and one for
// Tokyo (Japan)
$dateTimeZoneTaipei = new DateTimeZone("Asia/Taipei");
$dateTimeZoneJapan = new DateTimeZone("Asia/Tokyo");

// Create two DateTime objects that will contain the same Unix timestamp, but
// have different timezones attached to them.
$dateTimeTaipei = new DateTime("now", $dateTimeZoneTaipei);
$dateTimeJapan = new DateTime("now", $dateTimeZoneJapan);

// Calculate the GMT offset for the date/time contained in the $dateTimeTaipei
// object, but using the timezone rules as defined for Tokyo
// ($dateTimeZoneJapan).
$timeOffset = $dateTimeZoneJapan->getOffset($dateTimeTaipei);

// Should show int(32400) (for dates after Sat Sep 8 01:00:00 1951 JST).
var_dump($timeOffset);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

</refentry>

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