--TEST-- Test DateTime class inheritance : with user space format() method --FILE-- <?php //Set the default time zone date_default_timezone_set("Europe/London"); echo "*** Testing new DateTime() : with user format() method ***\n"; class DateTimeExt extends DateTime { public function format($format = "F j, Y, g:i:s a"): string { return parent::format($format); } } $d = new DateTimeExt("1967-05-01 22:30:41"); echo $d->format() . "\n"; ?> --EXPECT-- *** Testing new DateTime() : with user format() method *** May 1, 1967, 10:30:41 pm