backdate

/ˈbækˌdeɪt/
verb
  1. To put a date on a document or agreement that is earlier than the actual date.
    • The landlord agreed to backdate the lease to the first of the month.
    • She asked her boss to backdate her vacation request so it would be approved.
    • The contract was backdated to make it seem like it was signed last year.
Antonyms
What does "backdate" mean? | whatsthatwordmean | whatsthatwordmean