Through the Eyes of a Wombat

Two of the students here have spent apparently the entire weekend creating a table that is supposed to be of great use for borrowing library books.
Its a chart listing every day between now and the end of the year, paired up with the date that, if you borrow a library book, the due date. For example, if I borrowed a book today, it would be due on the 12th. If I borrowed a book this Thursday, it would be due back on the 15th.
For every day, they have written the date it will be precisely one week later.

Its a rather complicated chart, and I had to have the usage of it explained to me, along with examples.

Doesnt it seem simpler to have written something along the lines of "Books can be borrowed for one week"? Or am I trying to use logic again?

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