Source of: /manual/en/migration51.datetime.php
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<div id="migration51.datetime" class="section">
<h2 class="title">Date/time support</h2>
<p class="para">
Date/time support has been fully rewritten in PHP 5.1.x, and no longer uses
the system settings to 'know' the timezone in operation. It will instead
utilize, in the following order:
</p>
<ul class="itemizedlist">
<li class="listitem">
<p class="para">
The timezone set using the <a href="function.date-default-timezone-set.php" class="function">date_default_timezone_set()</a>
function (if any)
</p>
</li>
<li class="listitem">
<p class="para">
The TZ environment variable (if non empty)
</p>
</li>
<li class="listitem">
<p class="para">
"magical" guess (if the operating system supports it)
</p>
</li>
<li class="listitem">
<p class="para">
If none of the above options succeeds, UTC
</p>
</li>
</ul>
<div class="informalexample">
<p class="para">
To ensure accuracy (and avoid an <b><tt class="constant">E_STRICT</tt></b> warning),
you will need to define your timezone in your <var class="filename">php.ini</var>
using the following format:
</p>
<p class="para">
date.timezone = Europe/London
</p>
</div>
<p class="para">
The supported timezones are listed, in this format, in the
<a href="timezones.php" class="link">timezones appendix</a>.
</p>
<p class="para">
Also note that <a href="function.strtotime.php" class="function">strtotime()</a> now returns <b><tt class="constant">FALSE</tt></b> on
failure, instead of -1.
</p>
</div><?php manual_footer(); ?>
