What is the meaning of Postdate?

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 affix a date to after the event.

Postdated; made or done after the date assigned.

A date on a document later than the real date on which it was written.

inflection of postdater:

1. first/third-person singular present indicative/subjunctive
2. second-person singular imperative

first/third-person singular present indicative/subjunctive

second-person singular imperative

Source: wiktionary.org