I have looked at the posts on this topic using a Yes/No field. But would be possible to do it with DATEDIFF?
I have two simple fields. A submit_date (timestamp) and a deadline_date (text field as calendar popup). The app requires a minimum of 30 days to complete a request. So if someone submits a request (submit_date) and chooses a deadline date (Deadline) that does not meet then 30 day minimum notice we need that Deadline date text to be read preferrably (or the field background,