Is it 1. The renewal dates of the books 2. The renewal dates for the books
1 Answer
The renewal date of the books.
suggests that the date is something the books have.
The renewal date for the books.
suggests that the date is something the books receive.
Thus once you have picked the books up from the library, they have a renewal date, and you would speak of it as "the renewal date of the books". However, should you want to borrow them a little longer you may renew the books, thus receiving "a new renewal date for the books".