maskedit validator not validation date year part

Hi! please find code below, works but not validation example 09/09/0009 , so the year part should be 2009 but the validator accepting it. Thanks for the help.
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager> <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox> <cc1:MaskedEditExtender ID="MaskedEditExtender1" runat="server" Mask="99/99/9999" MaskType="Date" TargetControlID="TextBox1" PromptCharacter="_"> </cc1:MaskedEditExtender> <cc1:MaskedEditValidator ID="MaskedEditValidator1" runat="server" ControlExtender="MaskedEditExtender1" ControlToValidate="TextBox1" EmptyValueMessage="Date is required" InvalidValueMessage="Date is invalid" IsValidEmpty="False" TooltipMessage="Input a ...