postdate

Short definition from Wiktionary

Verb

1. 1
   To occur after an event or time; to exist later on in time.
2. 2
   To assign an effective date to a document or action later than the actual date.
3. 3
   To affix a date to after the event.

Adjective

1. 1
   Postdated; made or done after the date assigned.

Noun

1. 1
   A date on a document later than the real date on which it was written.