Wrong date format in Kendo Grid - kendo-ui

Question

I have a kendo grid,
#(Html.Kendo().Grid<TaskViewModel>()
.Name("grid")
.Deferred()
.ClientRowTemplate(Html.Partial("Partials/TaskGridRowTemplate").ToHtmlString())
.TableHtmlAttributes(new { #class = "table table-stripped" })
.Events(e => e.DataBound("setCdsPriority"))
.Columns(columns =>
{
columns.Bound(e => e.IsSelected)
.Sortable(true)
.Filterable(false)
.Title(string.Empty);
columns.Bound(e => e.ScanDate).Title("Scanning Date");
...
})
.Filterable()
.Selectable(selectable => selectable.Mode(GridSelectionMode.Multiple))
.Sortable()
.Pageable(x =>
{
x.ButtonCount(3);
x.Enabled(true);
x.PageSizes(new[] { "5", "10", "20" });
x.Refresh(true);
})
.DataSource(dataSource => dataSource
.Ajax()
.Read(read => read.Action("AllTasks", "Cockpit"))
.ServerOperation(true)
))
And I have to filter it as you can see in the image
This is the method that does the filter
public List<TaskViewModel> GetTasksFiltered(TaskFilterModel filters)
{
List<Task> tasks = service.GetTasksFiltered(MapperExtension.CreateMapper<TaskFilterModel, TaskFilter>(filters));
return tasks.Select(Convert).ToList();
}
This is the method that returns the results to the view
public JsonResult AllTasksFiltered(TaskFilterModel filters)
{
return Json(taskModelFactory.GetTasksFiltered(filters), JsonRequestBehavior.AllowGet);
}
And this is my ajax
function onClickSearch() {
var filtersObject =
{
CurrentWorkflowStepId: $("#taskStatus").data("kendoDropDownList").value(),
ScanFromDate: $("#scanFromDate").data("kendoDatePicker").value(),
ScanToDate: $("#scanToDate").data("kendoDatePicker").value(),
BusinessCase: $("#businessCase").data("kendoDropDownList").value(),
Region: $("#region").data("kendoDropDownList").value(),
ZR: $("#zr").val()
}
$.ajax({
type: "PUT",
url: "/Cockpit/AllTasksFiltered",
dataType: "json",
traditional: true,
data: JSON.stringify(filtersObject),
contentType: 'application/json; charset=utf-8',
success: function (data) {
$("#grid").data("kendoGrid").setDataSource(new kendo.data.DataSource({
data: data
}));
}
});
}
When the grid is first loaded, the Scanning Date column is ok.
This is the row template bit for the scanning date
<td>
#: kendo.toString(ScanDate, 'dd.MM.yyyy HH:mm')#
</td>
When I do a search, the date that is displayed is
/Date(1498558275437)/
The date has the right format before being displayed, but I get this strange format on screen.
Any ideas?
Tks in advance.