bool date_default_timezone_set ( string $timezone_identifier )
date_default_timezone_set('Asia/Manila');
$script_tz = date_default_timezone_get();
if (strcmp($script_tz, ini_get('date.timezone'))) {
echo 'Script timezone differs from ini-set timezone.';
} else {
echo 'Script timezone and ini-set timezone match.';
}
List of Supported Timezones