What is an antonym for "prior" that is shorter than "subsequent?"

Almost every time I've given or seen these sorts of navigation options (e.g. Google Calendar), the options are Previous and Next. It is often unnecessary to even provide Current; just provide a label to indicate what the currently selected period is.

How about "following"? http://www.thesaurus.com/browse/prior

Theoretically, "later" or "after" are shorter, but they don't seem to convey the right meaning in that context to me.

How about future?

Prior - Current - Future

Well, posterior is somewhat shorter (although subsequent is not a terribly long word, either). To boot, it is level with prior in style.

Rather rich in meaning, though.