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The RadDateInput control can work seamlessly with standard ASP.NET validation controls. Nevertheless, the validation controls such as RangeValidator is using a culture-neutral format when comparing the date. For this purpose, we parse the entered date in such culture which format is represented as follow "yyyy-MM-dd-hh-mm-ss" and saving it in RadInputValidationValue client property. When using RangeValidator you need to set its MaximumValue and MinimumValue in such format in order to work correctly. You have to use this format also when using a custom validator. The code snippet below demonstrates how to configure RangeValidator.

<telerik:RadDateInput RenderMode="Lightweight" ID="RadDateInput1" runat="server" DateFormat="d" MinDate="01/01/1990"
<asp:RangeValidator ID="DateInputRangeValidator" runat="server" ControlToValidate="RadDateInput1"
    ErrorMessage="Choose a date between 5th of January 20015 and 1st of September 20015"
    Display="Dynamic" MaximumValue="20015-09-01-00-00-00" MinimumValue="20015-01-05-00-00-00">