public ActionResult Chart(DateTime start, DateTime stop, TimeSpan step)
        {
            var chart = _repository.GetChart(start, stop, step);
            return PartialView(chart);
        }

        $.ajax({
            type: "POST",
            url: '@Url.Action("Chart", "Some")',
            data: ???
            success: function (result) {
                $("#chart").html(result);
            },
            error: function (xhr, ajaxOptions, thrownError) {
                alert(xhr.status);
                alert(thrownError);
            }
        });

        public ActionResult Chart(long start, long stop, long step)
        {
            var startDateTime = new DateTime(1970, 1, 1).AddMilliseconds(start);
            var stopDateTime = new DateTime(1970, 1, 1).AddMilliseconds(stop);
            var stepTimeSpan = new TimeSpan(step);
            var chart = _repository.GetChart(startDateTime, stopDateTime, stepTimeSpan);
            return PartialView(chart);
        }

        function getLocalTime(date) {
            var utc = date.getTime();
            var localOffset = (-1) * date.getTimezoneOffset() * 60000;
            return Math.round(new Date(utc + localOffset).getTime());
        }
        
        var start = new Date(2014, 0, 11, 14, 0, 0, 0); // 11.01.2014 14:00
        var stop = new Date(2014, 0, 11, 23, 59, 59, 0); // 12.01.2014 23:59:59
        var step = 36000000000; // 1 hour

        $.ajax({
            type: "POST",
            url: '@Url.Action("Chart", "Some")',
            data: { "start": getLocalTime(start), "stop": getLocalTime(stop), "step": step }
            success: function (result) {
                $("#chart").html(result);
            },
            error: function (xhr, ajaxOptions, thrownError) {
                alert(xhr.status);
                alert(thrownError);
            }
        });