Date inserting null from calendar text box.

Question

when i am inserting date from textbox calender then value is coming in debug,inserting like this into database 1/01/1900..

here is my html of textbox date.

<asp:TextBox ID="txtjdate" runat="server" ReadOnly="true" CssClass="textbox"></asp:TextBox>
                         <cc1:CalendarExtender ID="txtrechargedate_CalendarExtender" runat="server" Enabled="True"
                             TargetControlID="txtjdate" PopupPosition="BottomLeft">
                         </cc1:CalendarExtender>