How to get dates from a server

How to get dates from a server

I am writing an ASP.Net MVC application and I want to extract the bank holiday dates from the SQL database and use that to disable dates in my Jquery date picker.
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So the Controller looks like this; 

        [HttpGet]
        public ActionResult Get()
        {
            return BankHolidayViewModel.GetAllBankHolidays();
        }
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The Model looks like this;

        public static JsonResult GetAllBankHolidays()
        {
            using (SHPContainerEntities db = new SHPContainerEntities())
            {
                return ReturnJSON(db.BankHolidays.Select(x => x.BankHolidayDate).ToArray<DateTime>());
            }
        }

        private static JsonResult ReturnJSON(DateTime[] bankholidays)
        {
            JsonResult result = new JsonResult();
            result.Data = bankholidays;
            result.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
            return result;
        }

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My AJAX and Jquery is the part that doesn't work. I checked on Firebug for what is going on. The dates are returned from the server OK, but I do not know how to iterate through the dates collection.

    <script type="text/javascript">
        $(document).ready(function () {
            var holiDays = (function () {
                var val = null;
                $.getJSON('/BankHoliday/Get', function (data) {
                    val = data;
                });
                return val;
            })();

            function nationalDays(date) {
                var m = date.getMonth();
                var d = date.getDate();
                var y = date.getFullYear();

                for (var i = 0; i < holiDays.length - 1; i++) {
                    var myDate = new Date(holiDays[i]);
                    if ((m == (myDate.getMonth())) && (d == (myDate.getDate())) && (y == (myDate.getFullYear()))) {
                        return [false];
                    }
                }
                return [true];
            }

            function noWeekendsOrHolidays(date) {
                var noWeekend = $.datepicker.noWeekends(date);
                if (noWeekend[0]) {
                    return nationalDays(date);
                } else {
                    return noWeekend;
                }
            } 
            // noWeekendsOrHolidays
            // $.datepicker.noWeekends

            $(function () {
                $(".datePicker").datepicker({ showOn: 'both', dateFormat: 'dd MM yy', changeMonth: true, changeYear: true, yearRange: 'c-1:c+1', beforeShowDay: noWeekendsOrHolidays });
            });
        });
</script>