How to check input date is correct format or not in sharepoint date time control with compare validator

hi, i am creating dynamically on sharepoint date time controls in one link button click i need to check the input string is in date format or not uisng compare validator in code behind how can i do it can any one help me

for static controls i am uisng this like below

<sharePoint:DateTimeControl ID="dteDemo" runat="server" DateOnly="true" /><asp:CompareValidator id="valDate" runat="server"
         ForeColor="Red"
         ControlToValidate="dteDemo$dteDemoDate"
         Type="Date"
          Operator="DataTypeCheck"
          ErrorMessage="Please enter an valid date"></asp:CompareValidator >
how can i passw "Type, Operator, controltovalidate from code behind

Srinivas