SharePoint DateTime Control Validation

<wssawc:DateTimeControl ID="dteDemo" runat="server" DateOnly="true" ></wssawc:DateTimeControl>


<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ErrorMessage="Please select activity date." ControlToValidate="dteDemo$dteDemoDate" ValidationGroup="Activity" Display="None"></asp:RequiredFieldValidator>

<asp:CompareValidator id="vdate" Display="None" runat="server" ControlToValidate="dteDemo$dteDemoDate" Type="date" Operator="dataTypeCheck" ErrorMessage="Please enter an valid date." vallidationGroup="Activity"></asp:CompareValidator>