backdate

back|date /b'ækd'eɪt/ (backdates backdating backdated)
also back-date
[VERB] be V-ed to n, V n to n, also V n
If a document or an arrangement is backdated, it is valid from a date before the date when it is completed or signed.
The contract that was signed on Thursday morning was backdated to March 11...
Anyone who has overpaid tax will be able to backdate their claim to last April.

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