When library materials are checked out of a library at the circulation desk, each item is stamped with the date of the last day of the borrowing period. Fines are charged for items returned after the due date, unless the item has been renewed. Lost items are billed to the borrower.
Some libraries no longer stamp books with due dates but instead use a computer generated system which checks out library items to the user then provides them with a reciept listing the items charged as well as their due dates.
See also: overdue.