How can I get it to validate a date in the format: dd/mm/yyyy?.

There is a input mask in that format but the date validation requires mm/dd/yyyy.

Hello David,

You can use custom masking to set up the desired date format. Check the manual here for custom masking:
www.dmxzone.com/go/16777/universal-form-validator-asp-manual/reference_input_masks.htm

Probably a mask like the following one will work: 39/12/2999.

Regards.