post ‧ date /ˌpəʊstˈdeɪt $ ˌpoʊst-/ BrE AmE verb [transitive]
1 . if you postdate a cheque, you write it with a date that is later than the actual date, so that it will not become effective until that time ⇨ backdate
2 . to happen, live, or be made later in history than something else ⇨ predate :
Some of the mosaics postdate this period.