To validate a field within a range, use is_date_in_range 
<http://www.web2py.com/books/default/chapter/29/07/forms-and-validators#IS_DATE_IN_RANGE>

To validate fields in relation to each other after form submission, use 
onvalidation 
<http://www.web2py.com/books/default/chapter/29/07/forms-and-validators#onvalidation>

You could of course also validate the dates using jquery prior to form 
being submitted.

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- http://web2py.com/book (Documentation)
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