Change default timezone

date_default_timezone_set — Sets the default timezone used by all date/time functions in a script

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