Compare two dates with day, month & year javascript

var dateFrom = '10/10/2016';
          var dateTo = '14/10/2016';
          var partsFrom = dateFrom.split('/');
          var partsTo = dateTo.split('/');
          var date1 = new Date(partsFrom[2], partsFrom[1] - 1, partsFrom[0]);
          var date2 = new Date(partsTo[2], partsTo[1] - 1, partsTo[0]);


          var diff = Math.floor(date2.getTime() - date1.getTime());
              var day = 1000 * 60 * 60 * 24;

              var days = Math.floor(diff / day);
              var months = Math.floor(days / 31);
              var years = Math.floor(months / 12);