title: Issue with serverside filtering datetime kendo ui
body: <p>I have a problem with the serverside filtering of datetimes with a DataSourceRequest..</p>
  
  <p>I have a grid in my ShowProcesses.cshtml. I construct that kendo ui grid through javascript. I turned serverFiltering and serverSorting on. It looks like this (I kicked everything you don't need to see/know): </p>
  
  <pre><code>        $("#processGrid").kendoGrid({
              sortable: true,
              pageable: true,
              selectable: true,
              filterable: {
                  extra: false
              },
              dataSource: {
                  type: "aspnetmvc-ajax",
                  transport: {
                      read: {
                          url: "/Home/GetProcesses",
                          cache: false,
                          type: "POST",
                          dataType: "json"
                      },
                      parameterMap: function (data) {
                          return $.extend({}, data, { sort: data.sort, filter: data.filter });
                      }
                  },
                  serverPaging: true,
                  serverFiltering: true,
                  serverSorting: true,
                  page: "@ViewBag.ProcessPage",
                  schema: { data: "Data", total: "Total", model: { id: "Id" } },
                  pageSize: "@(@Model.MaxCountToShow)"
              },
              columns: [
                  { field: "ErrorDateTime", title: "ProcessDateTime", width: "170px"/*, filterable: { ui: dateFilter }*/ },
                  { field: "Name", title: "Processtype", attributes: { value: "type" }, width: "240px;", filterable: { ui: processtypeFilter} },
                  { field: "Service", title: "Service", width: "181px;", filterable: { ui: serviceFilter } },
                  { field: "Operation", title: "Operation", width: "130px", filterable: { ui: operationFilter } }
              ]
          }).data("kendoGrid");
  </code></pre>
  
  <p>One column of this kendo ui grid contains datetimes (title: ProcessDateTime, field: ErrorDateTime). This column can be filtered. 
  /Home/GetProcesses looks like this:</p>
  
  <pre><code>    public JsonResult GetProcesses([DataSourceRequest] DataSourceRequest request)
      {
        var result = homeModel.HomeModelGrid.ToDataSourceResult(request, p =&gt; new
          {
              Id = p.Id,
              ProcessDateTime = p.ProcessDateTime != null ? p.ProcessDateTime.ToString() : "",
              State = p.State,
              StateDetails = p.StateDetails != null ? p.StateDetails : "",
              Name = p.Name,
              Service = p.Service,
              Operation = p.Operation,
              ErrorDateTime = p.State == "Successful" || p.State == "Info" || p.State == "Warning" ? (p.ProcessDateTime != null ? p.ProcessDateTime.ToString() : "") : p.ErrorDateTime.ToString()
  
          });
  
          return new JsonResult { Data = result, JsonRequestBehavior = JsonRequestBehavior.AllowGet, MaxJsonLength = Int32.MaxValue };
      }
  </code></pre>
  
  <p>The DataSourceRequest request contains Filters, Sorts, Data, Page, PageSize, etc. The Filters are either of type FilterDescriptor or CompositeFilterDescriptor. The HomeModelGrid is a view which contains the columns that are used to create the result.</p>
  
  <p>If I try to filter the ProcessDateTime column (you enter a date in a textbox), I get the following error: 
  <em>An exception of type 'System.ArgumentException' occurred in Kendo.Mvc.dll but was not handled in user code; 
  Additional information: Provided expression should have string type</em></p>
  
  <p>I read a post where one guy suggested to set the MemberType of the FilterDescriptor to string. I tried it and got this error: 
  <em>An exception of type 'System.InvalidOperationException' occurred in System.Core.dll but was not handled in user code;
  Additional information: No coercion operator is defined between types 'System.DateTime' and 'System.String'.</em></p>
  
  <p>So, it tried to convert the string to a datetime. Therefore, I set the MemberType of the FilterDescriptor to DateTime and got the following error: 
  <em>An exception of type 'System.ArgumentException' occurred in Kendo.Mvc.dll but was not handled in user code;
  Additional information: Provided expression should have string type</em></p>
  
  <p>As I read this, I looked up the value that the Filterdescriptor was using for filtering. It was a string. I changed the Value of the FilterDescriptor to a DateTime and got this error: 
  <em>An exception of type 'System.ArgumentException' occurred in Kendo.Mvc.dll but was not handled in user code;
  Additional information: Provided expression should have string type</em></p>
  
  <p>I got this one before.. I really don't know what to do. </p>
  
  <p>The FilterDescriptor looks like this after changing the MemberType and converting the string to a datetime: </p>
  
  <pre><code>FilterDescriptor: 
    ConvertedValue: {03.11.2014 00:00:00}
    Member:  "ErrorDateTime"
    MemberType: {Name="DateTime" FullName="System.DateTime"}
    Operator: StartsWith
    Value: {03.11.2014 00:00:00}
  </code></pre>
  
  <p>Before, it looked like this: </p>
  
  <pre><code>FilterDescriptor: 
    ConvertedValue: "3.11.2014"
    Member:  "ErrorDateTime"
    MemberType: null
    Operator: "StartsWith"
    Value: "3.11.2014"
  </code></pre>
  
  <p>I really don't know how I can make it work. I appreciate any insights. Thanks and Ciao</p>