You'll need to use either a text field or a calculation field with a text result. such as:
If ( ExpressiontoDetermineApplicabilityGoesHere ; YourDateField ; "66/66/6666" )
I'd also provide the institution that you send this data to with user feedback complaining about this practice as it is not good way to do this and is an indication that they don't treat dates as actual dates. Such feedback is unlikely to produce any change in the near future, but if users don't complain, they have no reason to change their practices.
Thanks - that's what I assumed would have to happen but figured I would ask anyways!
Oh - we've complained :)