Hi,

function calcHours(){
  var date1 = document.getElementById('d1').value;
  var date2 = document.getElementById('d2').value;
  date1 = date1.split("-");
  date2 = date2.split("-");
  var sDate = new Date(date1[0]+"/"+date1[1]+"/"+date1[2]);
  var eDate = new Date(date2[0]+"/"+date2[1]+"/"+date2[2]);
  var hourhsDifference = Math.abs(Math.round((sDate-eDate)/1000*60*60));
  alert("hourhsDifference :"+hourhsDifference );
}