postdate vs predate

postdate and predate both are verbs.

Word	Noun	Adjective	Verb	Adverb
postdate	No	No	Yes	No
predate	No	No	Yes	No

postdate (verb)	predate (verb)
establish something as being later relative to something else	establish something as being earlier relative to something else
be later in time	be earlier in time; go back further
	come before
	prey on or hunt for