My library books are a week overdue.
我借圖書館的書過期一個星期了。
The baby is two weeks overdue (= the baby was expected to be born two weeks ago).
已經超過預產期兩周了。
Changes to the tax system are long overdue.
稅收制度早該改革了。
She feels she's overdue for promotion.
她覺得她早該被提升。