backdate
verb (used with object)
to date earlier than the actual date; predate; antedate.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The appeal had been ongoing, but since being contacted by the BBC, South West London CCG has now overturned its decision and said it will backdate the money.
From BBC ● Mar. 16, 2022