php-doc-en/reference/datetime/functions/date-default-timezone-set.xml

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<refentry id="function.date-default-timezone-set">
 <refnamediv>
  <refname>date_default_timezone_set</refname>
  <refpurpose>
   Sets the default timezone used by all date/time functions in a script
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>date_default_timezone_set</methodname>
   <methodparam><type>string</type><parameter>timezone_identifier</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>date_default_timezone_set</function> sets the default timezone
   used by all date/time functions.
  </para>
  <note>
   <para>
    Since PHP 5.1.0 (when the date/time functions were rewritten), every call
    to a date/time function will generate a <constant>E_NOTICE</constant> if
    the timezone isn't valid, and/or a <constant>E_STRICT</constant> message
    if using the system settings or the <varname>TZ</varname> environment
    variable.
   </para>
  </note>
 </refsect1>
 
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>timezone_identifier</parameter></term>
     <listitem>
      <para>
       The timezone identifier, like <literal>UTC</literal> or
       <literal>Europe/Lisbon</literal>. The list of valid identifiers is
       available in the <xref linkend="timezones"/>.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   This function always returns &true; (even if the
   <parameter>timezone_identifier</parameter> isn't valid).
  </para>
 </refsect1>

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

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