ASp.NET date validation

I am using the following to validate dates:

                                  <asp:CompareValidator id="valCompareDate"
                                          Runat="Server">End date must be reater than start date</asp:CompareValidator>

date forma tis dd/mm/yyyy
But when I enter: startdate: 11/12/2004  and enddate: 23/02/2005 I get error message than end date should be greater....
It only happens when end date's day is twenty something.....

any idea?


ps: date format is:
ValidationExpression="(0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](19|20)\d\d"

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This works out.....

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
        <asp:CompareValidator ID="CompareValidator1" runat="server" ControlToCompare="TextBox1"
            ControlToValidate="TextBox2" ErrorMessage="CompareValidator" Operator="GreaterThan"
Looks like the problem is occuring because of a date format issue. I believe your code is confused expecting dates to be in the format of mm/dd/yyyy but instead you are passing it dates formatted dd/mm/yyyy (correct me if I am wrong).

One way to fix it is to require users to input dates as yyyy/mm/dd as this will compare correctly no matter what the current locale is, and you can do that by changing your validation expression to this so that it checks for that format.

Good luck.

maybe it would be better to use the Control Validator with the ControlToValidate method... i.e. comparing the two dates that are entered in two seperate textboxes as follows...

Start Date: <asp:TextBox  id="txtStartDate"  Columns="10"  Runat="Server"/>
End Date: <asp:TextBox  id="txtEndDate"  Columns="10"  Runat="Server"/>

 Text="End date must be greater than start date!"
 Runat="Server" />

hope this is at least food for thought.
The two dates you supplied work as expected with the above code by the way.
By default your .net app will use the input locale of your computer, check you have the correct locale set e.g. Uk for a dd/mm/yyyy date format over a US mm/dd/yyyy format.

You can also edit the locale for the specific app in the web.config file by setting the culture as

    uiCulture="en-GB" />

I only ever deal with UK for dates etc. so sorry if my assumptions are incorrect.

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