Time calculation between 2 dates

@Dave friend solution can be slightly simplify

PHP Code:

 $start = new DateTime("2017-03-09 09:26:00");
  $end = new DateTime("2017-03-11 09:25:00");
  $interval = $start->diff($end);
  echo $interval->format('%h hours %i minutes %S seconds'); 


@salain, But that won't give the right answer if the interval is more than a day. Those hours must me added to the result.