I'm not really sure how to describe this but hopefully I can describe it clear enough.
I created a custom field set that holds borrowing information for items (like tools, equipment, etc.). It has 3 fields (actually more, but here 3 is enough to describe the problem): Item name, Date borrowed, Date returned.
A contact can borrow multiple items at once.
Is there a way to search for contacts who have not borrowed any item in the last 6 months?