Create a calculated item and then Use function TreatAs to convert dates into numbers and subtract them. If they are in DateTime then don't forget to use DatePart. If you want to do Today - StartDate then you could use TreatAs DatePart ( Now() ). If you want to do EndDate - StartDate OR Today - StartDate (if EndDate is missing), you could do that too using the Boolean Operator first.
... View more
