Javascript difference between two times in hours and minutes || How to calculate hours between two time in javascript

 

<script>

               var start = 9:00;  /*AM*/

               var end = 05:00;  /*PM*/

start = start.split(":");

end = end.split(":");

if(Number(start[0]) > Number(end[0]) ) {

  var num = Number(start[0])

  var countTo = Number(end[0]);

  var count = 0;

  for (var i = 1; num != countTo;) {

num = num + i

if(num > 24) {

  num = 0

}

count++

  }

  var hours = count - 1;

  var startDate = new Date(0, 0, 0, start[0], start[1], 0);

  var endDate = new Date(0, 0, 0, end[0], end[1], 0);

  if(startDate.getMinutes() > endDate.getMinutes()) {

var hours = count - 2;

var diff = 60 - (startDate.getMinutes() - endDate.getMinutes());      

  } else {

var diff = endDate.getMinutes() - startDate.getMinutes();      

  }

  var minutes = diff

} else {

  var startDate = new Date(0, 0, 0, start[0], start[1], 0);

  var endDate = new Date(0, 0, 0, end[0], end[1], 0);

  var diff = endDate.getTime() - startDate.getTime();

  var hours = Math.floor(diff / 1000 / 60 / 60);

  diff -= hours * 1000 * 60 * 60;

  var minutes = Math.floor(diff / 1000 / 60);

var returnValue = (hours < 9 ? "0" : "") + hours + ":" + (minutes < 9 ? "0" : "") + minutes;

               console.log(returnValue );  //8:00 hours

</script>