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<refentry xml:id="function.date-default-timezone-get" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>date_default_timezone_get</refname>
  <refpurpose>
   Gets the default timezone used by all date/time functions in a script
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>date_default_timezone_get</methodname>
   <void/>
  </methodsynopsis>
  <para>
   In order of preference, this function returns the default timezone by:
   <itemizedlist>
    <listitem>
     <para>
      Reading the timezone set using the
      <function>date_default_timezone_set</function> function (if any)
     </para>
    </listitem>
    <listitem>
     <para>
      Prior to PHP 5.4.0 <emphasis>only</emphasis>: Reading the <varname>TZ</varname>
      environment variable (if non empty)
     </para>
    </listitem>
    <listitem>
     <para>
      Reading the value of the <link linkend="ini.date.timezone">date.timezone</link> ini option
      (if set)
     </para>
    </listitem>
    <listitem>
     <para>
      Prior to PHP 5.4.0 <emphasis>only</emphasis>: Querying the host operating system (if supported
      and allowed by the OS). This uses an algorithm
      that has to <emphasis>guess</emphasis> the timezone. This is by no means going to work correctly for 
      every situation. A warning is shown when this stage is reached. Do not rely on it to be guessed
      correctly, and set <link linkend="ini.date.timezone">date.timezone</link> to the correct timezone
      instead.
     </para>
    </listitem>
   </itemizedlist>
  </para>
  <para>
   If none of the above succeed, <methodname>date_default_timezone_get</methodname>
   will return a default timezone of <literal>UTC</literal>.
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns a <type>string</type>.
  </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>5.4.0</entry>
       <entry>
        The <literal>TZ</literal> environment variable is no longer used to
        guess the timezone.
       </entry>
      </row>
      <row>
       <entry>5.4.0</entry>
       <entry>
        The timezone is no longer guessed from information available through the
        operating system as the guessed timezone can not be relied on.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Getting the default timezone</title>
    <programlisting role="php">
<![CDATA[
<?php
date_default_timezone_set('Europe/London');

if (date_default_timezone_get()) {
    echo 'date_default_timezone_set: ' . date_default_timezone_get() . '<br />';
}

if (ini_get('date.timezone')) {
    echo 'date.timezone: ' . ini_get('date.timezone');
}

?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
date_default_timezone_set: Europe/London
date.timezone: Europe/London
]]>
    </screen>
   </example>
  </para>
  <para>
   <example>
    <title>Getting the abbreviation of a timezone</title>
    <programlisting role="php">
<![CDATA[
<?php
date_default_timezone_set('America/Los_Angeles');
echo date_default_timezone_get() . ' => ' . date('e') . ' => ' . date('T');
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
America/Los_Angeles => America/Los_Angeles => PST
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>date_default_timezone_set</function></member>
    <member><xref linkend="timezones" /></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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