Please I have Problem with date Function

I have being using this <?php echo date (‘l,F dS Y.’); ?></p> for a while… but lately I upgrade my php to 5.3.8 and when I run the Date Code… this is what it bring out … please help … thanks

<?php echo date (‘l,F dS Y.’); ?></p>

Warning: date() []: It is not safe to rely on the system’s timezone settings. You are required to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected ‘UTC’ for ‘8.0/no DST’ instead in C:\Program Files (x86)\Apache Software Foundation\Apache2.2\htdocs\ oday\index.php on line 9
Sunday,September 25th 2011.

Have you tried any of the fixes found in #9 of the Common PHP Problems Sticky?