verb (used with object), backdated, backdating.
to date earlier than the actual date; predate; antedate: Backdate the letter so he'll think I wrote it last week.

1945–50, Americanism; back2 + date1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
backdate (ˌbækˈdeɪt)
(tr) to make effective from an earlier date: the pay rise was backdated to August

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1946, from back (adj.) + date. Cf. antedate.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Correlates with today's date, backdate reason, and liable state.
We will backdate transactions received in those months up to the issuance of the adjusted reports.
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