back·date /ˌbækˈdeɪt $ ˈbækdeɪt/ verb [transitiveT] 1 BEBFto make something have its effect from an earlier date 追溯到,从〔过去某个日期〕开始生效backdate something from/to something The pay increase will be backdated to January. 这次加薪将追溯至1月份。
2. American EnglishAmE to write an earlier date on a document or cheque than when it was actually written 在〔文件或支票〕上倒填日期 backdate something from/to something• The pay increase will be backdated to January.
From Longman Business Dictionary
backdateback·date /ˌbækˈdeɪtˈbækdeɪt/ verb [transitiveT]1if a change in an amount paid is backdated, it has its effect from an earlier datebe backdated toPostal workers are getting a 3.3% wage rise backdated to October.
2to put a date on a document that is earlier than the real dateIt was alleged that he had backdated the sale documents to evade a court order.