Postdate vs Predatep - What's the difference?

postdate

(postdat)

To occur after an event or time; to exist later on in time

To assign an effective date to a document or action later than the actual date

to postdate a contract, that is, to date it later than the time when it was in fact made

To affix a date to after the event.

(both senses) predate

(-)

(obsolete) postdated; made or done after the date assigned.

* Fuller

Of these [predictions] some were postdate , cunningly made after the thing came to pass.

----

Predatep has no English definition. It may be misspelled.