Forward dating
Forward dating, also called postdating or post-dating, is the signing of a document with a timestamp with a later (more recent or future) date and time than the time the document was actually signed. The opposite is backdating, i.e. writing an earlier date/time than what is actually the time when the time is written. Backdating and forward dating are in many cases undesirable, and can constitute document forgery, but can also have legitimate purposes.