Princeton's WordNet

1. backdate(verb)

   make effective from an earlier date

   "The increase in tax was backdated to January"

Wiktionary

1. backdate(Verb)

   To give or assign a date to a document that is earlier than the current date.

Origin: back + date

• agternadateerAfrikaans
• يُؤَرِّخ بِتاريخ سابِقArabic
• слагам по-раншна датаBulgarian
• pré-datarPortuguese (BR)
• antedatovatCzech
• zurückdatierenGerman
• tilbagedatere; baguddatereDanish
• βάζω σε ένα έγγραφο ημερομηνία προγενέστερη από την αληθινήGreek
• antedatarSpanish
• (tšekile) varasemat kuupäeva kirjutamaEstonian
• به تاریخ گذشته چک نوشتنFarsi
• aikaistaaFinnish
• antidaterFrench
• לִקְבּוֹע מוֹעֵד מוּקדַם יוֹתֵרHebrew
• पीछली तारीखHindi
• antedatiratiCroatian
• antedatálHungarian
• memundurkan tanggalIndonesian
• dagsetja afturí tímaIcelandic
• retrodatareItalian
• 日付をさかのぼらせるJapanese
• 이전의 날짜로 하다Korean
• rašyti atgaline dataLithuanian
• rakstīt atpakaļejošu datumuLatvian
• mengundurkanMalay
• antedaterenDutch
• sette en tidligere dato, antedatereNorwegian
• antydatowaćPolish
• به تاریخ گذشته چک نوشتنPersian
• په تير شوي نيټي چك ليكلPashto
• antedatarPortuguese
• a antedataRomanian
• помечать задним числомRussian
• antedatovaťSlovak
• antedatiratiSlovenian
• antidatiratiSerbian
• ลงวันที่ก่อนวันจริงThai
• ön günlemek, daha önceki bir tarihi atmakTurkish
• 在(支票)上填上先前的日期Chinese (Trad.)
• датувати заднім числомUkrainian
• گذشتہ تاریخ ڈالناUrdu
• ghi lùi ngàyVietnamese
• 在（支票）上书写更早的日期Chinese (Simp.)