Word Study
postdated
THESAURUS
postdated
ahead of time, anachronistic, antedated, beforehand, behind time, behindhand, dated, early, foredated, late, metachronistic, misdated, mistimed, out of date, out of season, overdue, parachronistic, past due, prochronistic, tardy, unpunctual, unseasonable
For further exploring for "postdated" in Webster Dictionary Online