how get Two date Diff in jquery

Question

 I have Used two date using datepicker .how to calculate date difference in jquery.

 

I have applied blow code but in that, the code I want 3 days to count using the form to date that time count will be 2 displayed. 

 

@Html.TextBoxFor(m => m.fromDate, new { @class = "form-control", @placeholder = "From Date", @id = "fromDate"})
  @Html.TextBoxFor(m => m.toDate, new { @class = "form-control",  @placeholder = "To Date", @id = "toDate"})



$("#fromDate").datepicker({

            minDate: 0,
            maxDate: '+0Y+1M',

            onSelect: function (dateStr) {
                var min = $(this).val();
            }
        });

        $("#toDate").datepicker({

            minDate: '0',
            maxDate: '+0Y+1M',
            onSelect: function (dateStr) {
                debugger;
                var max = $(this).val(); // Get selected date

                var start = $("#fromDate").val();
                var end = $("#toDate").val();

                var days = Math.round(Math.abs((new Date(end) - new Date(start)) / (1000 * 60 * 60 * 24)));
                $("#TextBox3").val(Math.round(days));
            }
        });

 please help

 

 

I want data that like..

01/07/2019 TO 03/07/2019   Totals days =3