function StringToDate(string) {
            return new Date(Date.parse(string.replace(/-/g, "/")));
}
 function countTimeLength(interval, date1, date2) {
            var objInterval = {'D' : 1000 * 60 * 60 * 24, 'H' : 1000 * 60 * 60, 'M' : 1000 * 60, 'S' : 1000, 'T' : 1};
            interval = interval.toUpperCase();
            var dt1 = Date.parse(StringToDate(date1));
            alert(dt1);
            var dt2 = Date.parse(StringToDate(date2));
            try {
                return ((dt2 - dt1) / (objInterval[interval]));
            }
            catch (e) {
                return e.message;
            }
}