I'm downloading listings and want to know when they expire, can SalesPartner tell me which listings are 90 days old?
In SalesPartner Reports you could use an expression to calculate a listing's theoretical expiry date by adding 90 days to the listed date.
CALCDATE(Listings.ListDate, 90, 0, 0)
Alternatively you could replace a standard Listings.ExpiryDate field with this argument to show the calculated expiry date only when an expiry date is not found. In this example the calculated date is tagged with an asterisk so you can reference the behavior in your report footnotes.
IF(Listings.ExpiryDate <> '', Listings.ExpiryDate, CALCDATE(Listings.ListDate, 90, 0, 0) + '*')