now()->format('H:i:s'), $clock->now()->format('H:i:s') ); $frozenClock->setTo($frozenClock->now()->modify('+10 seconds')); // 01:23:55 printf("For %s, the minute clock still returns %s\n", $frozenClock->now()->format('H:i:s'), $clock->now()->format('H:i:s') );