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• out of date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