Date format problem in CompareValidator

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ASP.NET

validation

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<asp:TextBox ID="txt_dateofjoin" runat="server" />
<cc1:CalendarExtender ID="cal2" runat="server" TargetControlID="txt_dateofjoin" Format="dd-MM-yyyy" TodaysDateFormat="dd-MM-yyyy"></cc1:CalendarExtender>

<asp:TextBox ID="txt_confirmationdate" runat="server" />
<cc1:CalendarExtender ID="cal" runat="server" Format="dd-MM-yyyy" TargetControlID="txt_confirmationdate" TodaysDateFormat="dd-MM-yyyy">
</cc1:CalendarExtender>

<asp:CompareValidator ID="cmpDates" runat="server" ControlToCompare="txt_dateofjoin" ControlToValidate="txt_confirmationdate" Operator="GreaterThan" Type="Date" SetFocusOnError="true" Display="Dynamic" Text="Confirm Date must be greater than Joining Date" />

when I change the Format of CalendarExtender to MM-dd-yyyy then it works fine but in dd-MM-yyyy compare validator consider date to month. Now how I can validate this two date in dd-MM-yyyy format.