From Longman Dictionary of Contemporary Englishbackdateback‧date /ˌbækˈdeɪt $ ˈbækdeɪt/ verb [transitive] 1 BEBFto make something have its effect from an earlier datebackdate something from/to something The pay increase will be backdated to January.2 American English to write an earlier date on a document or cheque than when it was actually written→ See Verb table
Examples from the Corpus
backdate• If you delay claiming for more than three months, you can not normally get the pension backdated.• But Sting's royalty rate was increased, and backdated, giving him an immediate cash payment of some £100,000.• There is nothing to stop them doing better than this and backdating this improvement.• About 60,000 part-time workers have won the right to pension benefits backdated to 1976.• The senior registrar contract arrived dated May 1988, and a six month battle ensued to get it backdated to January 1987.• The increase was to be backdated to June 1 and would rise to 75 percent by the last quarter of 1991.• The ban was backdated to midnight on Monday.backdate something from/to something• The pay increase will be backdated to January.From Longman Business Dictionarybackdateback‧date /ˌbækˈdeɪtˈbækdeɪt/ verb [transitive]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.→ See Verb table 