var filter = "9/11/2025,12:00:00,AM 9/12/2025,11:59:59,PM"
tableView.filter(columnName, filter, "Between");

<FilterTemplate>
                        <telerik:RadLabel runat="server" AssociatedControlID="FromOrderDatePicker" Text="From"></telerik:RadLabel>
                        <telerik:RadDatePicker RenderMode="Lightweight" ID="FromOrderDatePicker" runat="server" Width="140px" ClientEvents-OnDateSelected="FromDateSelected"
                            MinDate="07-04-1996" MaxDate="05-06-1998" FocusedDate="07-04-1996" DbSelectedDate='<%# startDate %>' />
                        <telerik:RadLabel runat="server" AssociatedControlID="ToOrderDatePicker" Text="to" Style="padding-left: 5px;"></telerik:RadLabel>
                        <telerik:RadDatePicker RenderMode="Lightweight" ID="ToOrderDatePicker" runat="server" Width="140px" ClientEvents-OnDateSelected="ToDateSelected"
                            MinDate="07-04-1996" MaxDate="05-06-1998" FocusedDate="05-06-1998" DbSelectedDate='<%# endDate %>' />
                            <telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">
                                <script type="text/javascript">
                                    function FromDateSelected(sender, args) {
                                        var tableView = $find("<%# ((GridItem)Container).OwnerTableView.ClientID %>");
                                    var ToPicker = $find('<%# ((GridItem)Container).FindControl("ToOrderDatePicker").ClientID %>');
 
                                    var fromDate = FormatSelectedDate(sender) + ",12:00:00,AM";
                                    var toDate = FormatSelectedDate(ToPicker) + ",11:59:59,PM";

                                    tableView.filter("OrderDate", fromDate + " " + toDate, "Between");
 
                                }
                                function ToDateSelected(sender, args) {
                                    var tableView = $find("<%# ((GridItem)Container).OwnerTableView.ClientID %>");
                                    var FromPicker = $find('<%# ((GridItem)Container).FindControl("FromOrderDatePicker").ClientID %>');
 
                                    var fromDate = FormatSelectedDate(FromPicker);
                                    var toDate = FormatSelectedDate(sender);
 
                                    tableView.filter("OrderDate", fromDate + " " + toDate, "Between");
                                }
                                function FormatSelectedDate(picker) {
                                    var date = picker.get_selectedDate();
                                    var dateInput = picker.get_dateInput();
                                    var formattedDate = dateInput.get_dateFormatInfo().FormatDate(date, dateInput.get_displayDateFormat());
 
                                    return formattedDate;
                                }
                                </script>
                            </telerik:RadScriptBlock>
                        </FilterTemplate>