<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Sets the default timezone used by all date/time functions in a script</title>
</head>
<body><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.date-default-timezone-get.html">date_default_timezone_get</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.date-diff.html">date_diff</a></div>
<div class="up"><a href="ref.datetime.html">Date/Time Functions</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div><hr /><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>
<div class="refsect1 description" id="refsect1-function.date-default-timezone-set-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><strong>date_default_timezone_set</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$timezone_identifier</code></span>
)</div>
<p class="para rdfs-comment">
<span class="function"><strong>date_default_timezone_set()</strong></span> sets the default timezone
used by all date/time functions.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
Since PHP 5.1.0 (when the date/time functions were rewritten), every call
to a date/time function will generate a <strong><code>E_NOTICE</code></strong> if
the timezone isn't valid, and/or a <strong><code>E_WARNING</code></strong> message
if using the system settings or the <var class="varname"><var class="varname">TZ</var></var> environment
variable.
</p>
</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.html#ini.date.timezone" class="link">date.timezone</a> to set the default
timezone.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.date-default-timezone-set-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">timezone_identifier</code></em></span>
<dd>
<p class="para">
The timezone identifier, like <em>UTC</em> or
<em>Europe/Lisbon</em>. The list of valid identifiers is
available in the <a href="timezones.html" class="xref">List of Supported Timezones</a>.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.date-default-timezone-set-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
This function returns <strong><code>FALSE</code></strong> if the
<em><code class="parameter">timezone_identifier</code></em> isn't valid, or <strong><code>TRUE</code></strong>
otherwise.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.date-default-timezone-set-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-2295">
<p><strong>Example #1 Getting the default timezone</strong></p>
<div class="example-contents">
<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>
</div>
<div class="refsect1 changelog" id="refsect1-function.date-default-timezone-set-changelog">
<h3 class="title">Changelog</h3>
<p class="para">
<table class="doctable informaltable">
<thead>
<tr>
<th>Version</th>
<th>Description</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>5.3.0</td>
<td>
Now throws <strong><code>E_WARNING</code></strong> rather than
<strong><code>E_STRICT</code></strong>.
</td>
</tr>
<tr>
<td>5.1.2</td>
<td>
The function started to validate the
<em><code class="parameter">timezone_identifier</code></em> parameter.
</td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.date-default-timezone-set-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.date-default-timezone-get.html" class="function" rel="rdfs-seeAlso">date_default_timezone_get()</a> - Gets the default timezone used by all date/time functions in a script</span></li>
<li class="member"><a href="timezones.html" class="xref">List of Supported Timezones</a></li>
</ul>
</p>
</div>
</div><hr /><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.date-default-timezone-get.html">date_default_timezone_get</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.date-diff.html">date_diff</a></div>
<div class="up"><a href="ref.datetime.html">Date/Time Functions</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div></body></html>
