1) Assign a wrong year to 2) Assign the wrong date to 3) Check goof 4) Date 5) Err as to the origin of 6) Mess up a check 7) Show the wrong time of month 8) Stamp incorrectly 9) To date incorrectly 10) To mark with the wrong date 11) Write the wrong number on Found on https://www.crosswordclues.com/clue/misdate
Mis·date' transitive verb [ imperfect & past participle Misdated ; present participle & verbal noun Misdating .] To date erroneously. Young. Found on http://www.encyclo.co.uk/webster/M/75