Check whether The time exists between two date time

var curentDate = new Date().toLocaleString();
           var fromdate = document.getElementById("hdnfromdate").value;
           var todate = document.getElementById("hdntodate").value;
           var date = new Date(fromdate);
           var offset = date.getTimezoneOffset();
           var finalFrom = date.getTime() + (-offset) * 60 * 1000;
           var finalFromDate = new Date(finalFrom).toLocaleString();

           var todate = new Date(todate);
           var offset = todate.getTimezoneOffset();
           var finalTo = todate.getTime() + (-offset) * 60 * 1000;
           var finalFromTo = new Date(finalTo).toLocaleString();