Source of: /manual/en/function.date-default-timezone-set.php
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<div id="function.date-default-timezone-set" class="refentry">
<div class="refnamediv">
<h1 class="refname">date_default_timezone_set</h1>
<p class="verinfo">(PHP 5 >= 5.1.0)</p><p class="refpurpose"><span class="refname">date_default_timezone_set</span> — <span class="dc-title">
Sets the default timezone used by all date/time functions in a script
</span></p>
</div>
<a name="function.date-default-timezone-set.description"></a><div class="refsect1 description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><b>date_default_timezone_set</b></span>
( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$timezone_identifier</tt></span>
)</div>
<p class="para rdfs-comment">
<b>date_default_timezone_set()</b> sets the default timezone
used by all date/time functions.
</p>
<blockquote><p><b class="note">Note</b>:
Since PHP 5.1.0 (when the date/time functions were rewritten), every call
to a date/time function will generate a <b><tt class="constant">E_NOTICE</tt></b> if
the timezone isn't valid, and/or a <b><tt class="constant">E_WARNING</tt></b> message
if using the system settings or the <var class="varname">TZ</var> environment
variable.
<br />
</p></blockquote>
<p class="para">
Instead of using this function to set the default timezone in your script,
you can also use the INI setting <a href="datetime.configuration.php#ini.date.timezone" class="link">date.timezone</a> to set the default
timezone.
</p>
</div>
<a name="function.date-default-timezone-set.parameters"></a><div class="refsect1 parameters">
<h3 class="title">Parameters</h3>
<p class="para">
</p><dl>
<dt class="varlistentry">
<span class="term"><i><tt class="parameter">timezone_identifier</tt></i>
</span>
</dt><dd class="listitem">
<p class="para">
The timezone identifier, like <i>UTC</i> or
<i>Europe/Lisbon</i>. The list of valid identifiers is
available in the <a href="timezones.php" class="xref">List of Supported Timezones</a>.
</p>
</dd>
</dl>
<p>
</p>
</div>
<a name="function.date-default-timezone-set.returnvalues"></a><div class="refsect1 returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
This function returns <b><tt class="constant">FALSE</tt></b> if the
<i><tt class="parameter">timezone_identifier</tt></i>
isn't valid, or <b><tt class="constant">TRUE</tt></b>
otherwise.
</p>
</div>
<a name="function.date-default-timezone-set.examples"></a><div class="refsect1 examples">
<h3 class="title">Examples</h3>
<p class="para">
</p><div class="example">
<p><b>Example #1 Getting the default timezone</b></p>
<div class="example-contents programlisting">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />date_default_timezone_set</span><span style="color: #007700">(</span><span style="color: #DD0000">'America/Los_Angeles'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$script_tz </span><span style="color: #007700">= </span><span style="color: #0000BB">date_default_timezone_get</span><span style="color: #007700">();<br /><br />if (</span><span style="color: #0000BB">strcmp</span><span style="color: #007700">(</span><span style="color: #0000BB">$script_tz</span><span style="color: #007700">, </span><span style="color: #0000BB">ini_get</span><span style="color: #007700">(</span><span style="color: #DD0000">'date.timezone'</span><span style="color: #007700">))){<br /> echo </span><span style="color: #DD0000">'Script timezone differs from ini-set timezone.'</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">'Script timezone and ini-set timezone match.'</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div><p>
</p>
</div>
<a name="function.date-default-timezone-set.changelog"></a><div class="refsect1 changelog">
<h3 class="title">Changelog</h3>
<p class="para">
</p><table class="doctable informaltable">
<thead valign="middle">
<tr valign="middle">
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody valign="middle" class="tbody">
<tr valign="middle">
<td align="left">5.3.0</td>
<td align="left">
Now throws <b><tt class="constant">E_WARNING</tt></b> rather then
<b><tt class="constant">E_STRICT</tt></b>.
</td>
</tr>
<tr valign="middle">
<td align="left">5.1.2</td>
<td align="left">
The function started to validate the
<i><tt class="parameter">timezone_identifier</tt></i>
parameter.
</td>
</tr>
</tbody>
</table>
<p>
</p>
</div>
<a name="function.date-default-timezone-set.seealso"></a><div class="refsect1 seealso">
<h3 class="title">See Also</h3>
<p class="para">
</p><ul class="simplelist">
<li class="member"><a href="function.date-default-timezone-get.php" class="function" rel="rdfs-seeAlso">date_default_timezone_get()</a> - Gets the default timezone used by all date/time functions in a script</li>
<li class="member"><a href="timezones.php" class="xref">List of Supported Timezones</a></li>
</ul><p>
</p>
</div>
</div><?php manual_footer(); ?>
