How to display date difference in hours?

Question

opencart

Hello!
$date1 = ('2016-06-05 12:24:21');
$date2 = ('2016-07-01 16:59:01');
How to calculate the difference in dates in hours and display how many hours have passed since the first date?

Answer 1

$date1 = ('2016-06-05 12:24:21');
$date2 = ('2016-07-01 16:59:01');
$hours=date_diff(new DateTime($date1), new DateTime($date2))->days*24;
echo $hours;