: to give (something) a date that is later than the actual or current date. : to exist, happen, or be made at a later time than (something)

What is pre date and post date?

is that postdate is to occur after an event or time; to exist later on in time while predate is to designate a date earlier than the actual one; to move a date, appointment, event, or period of time to an earlier point (contrast "postdate") or predate can be to prey upon something.

Is it postdated or post dated?

verb (used with object), post·dat·ed, post·dat·ing. to date (a check, invoice, letter, document) with a date later than the actual date. to follow in time: His recognition as an artist postdated his death.