misdate

[ mis-deyt ]
/ mɪsˈdeɪt /

verb (used with object), mis·dat·ed, mis·dat·ing.

to assign or affix a wrong date to.

noun

a wrong date.

Origin of misdate

First recorded in 1580–90; mis-1 + date1

British Dictionary definitions for misdate

misdate
/ (mɪsˈdeɪt) /

verb

(tr) to date (a letter, event, etc) wrongly