date_default_timezone_set
(PHP 5 >= 5.1.0)
date_default_timezone_set — Sets the default timezone used by all date/time functions in a script
Example #1 Getting the default timezone
<?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.';
}
?>