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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xml:id="function.date-default-timezone-set" xmlns="http://docbook.org/ns/docbook">
<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_WARNING</constant> message
if using the system settings or the <varname>TZ</varname> environment
variable.
</para>
</note>
<para>
Instead of using this function to set the default timezone in your script,
you can also use the INI setting <link
linkend="ini.date.timezone">date.timezone</link> to set the default
timezone.
</para>
</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 returns &false; if the
<parameter>timezone_identifier</parameter> isn't valid, or &true;
otherwise.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title>Getting the default timezone</title>
<programlisting role="php">
<![CDATA[
<?php
date_default_timezone_set('America/Los_Angeles');
$script_tz = date_default_timezone_get();
if (strcmp($script_tz, ini_get('date.timezone'))){
echo 'Script timezone differs from ini-set timezone.';
} else {
echo 'Script timezone and ini-set timezone match.';
}
?>
]]>
</programlisting>
</example>
</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>5.3.0</entry>
<entry>
Now throws <constant>E_WARNING</constant> rather then
<constant>E_STRICT</constant>.
</entry>
</row>
<row>
<entry>5.1.2</entry>
<entry>
The function started to validate the
<parameter>timezone_identifier</parameter> parameter.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>date_default_timezone_get</function></member>
<member><xref linkend="timezones" /></member>
</simplelist>
</para>
</refsect1>
</refentry>
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