Unable to retrieve Date Array object from c# to javascript?

I am trying to fetch Array of dates object from c# to javascript using below code but its returing in incorrect format like below-

\/Date(1309471200000)\/

Also tried Date.parse function but didn’t work.

$.getJSON("GetActivedates", function (validdates) {           

            $.each(datetemp in validdates)

            {

}

)};

Here is the c# routine which is returning Dates Array

public JsonResult GetActivedates()

        {

            Models.ReportViewModel dates = new Models.ReportViewModel();

            dates.ActiveDates = ValidActiveDates();

            return Json(dates.ActiveDates, JsonRequestBehavior.AllowGet);

        }

public DateTime[] ValidActiveDates()

        {

using (var db = new SalesMetadataModelContainer())

            {

                int i = 0;

                var reportdateList = db.SalesReports.Where(x => x.Audit.IsDeleted == false && x.IsVisible == true).Select(x => x.ReportDate).Distinct().ToList();

                DateTime[] activedate = new DateTime[reportdateList.Count];

                DateTime StrDate = System.DateTime.Today;

                foreach (var res in reportdateList)

                {

                    StrDate = res;

                    activedate[i++] = StrDate;

                }

                return activedate;

            }

        }

I have tried various work around but nothing works, any suggestions are most welcome!!

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