Calculate difference between 2 timestamps using javascript

i am posting my own example try implement this in your code

function timeDifference(date1,date2) {
    var difference = date1.getTime() - date2.getTime();

    var daysDifference = Math.floor(difference/1000/60/60/24);
    difference -= daysDifference*1000*60*60*24

    var hoursDifference = Math.floor(difference/1000/60/60);
    difference -= hoursDifference*1000*60*60

    var minutesDifference = Math.floor(difference/1000/60);
    difference -= minutesDifference*1000*60

    var secondsDifference = Math.floor(difference/1000);

    console.log('difference=" + 
      daysDifference + " day/s ' + 
      hoursDifference + ' hour/s ' + 
      minutesDifference + ' minute/s ' + 
      secondsDifference + ' second/s ');
}