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Rules with partial date PDATE

Hi all
We have a CRF with start and end dates set up as PDATE.  In most cases the full date will be known but there is a chance it wont be. If a full date is entered, we want to be able to perform checks between the 2 dates but I can't use calculations or "lt", "gt" with PDATE datatype.   Is there another way of performing checks between these items when they are both full dates? 
Thanks for your help
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