1$datetime1 = new DateTime('2016-11-30 03:55:06');//start time
2$datetime2 = new DateTime('2016-11-30 11:55:06');//end time
3$interval = $datetime1->diff($datetime2);
4echo $interval->format('%Y years %m months %d days %H hours %i minutes %s seconds');//00 years 0 months 0 days 08 hours 0 minutes 0 seconds