A past devoid of time...

We said; in some discussions that time is change. Time is the measure of time. So, if an apple becomes a pie, it has, according to most, done so in time; that change itself being time incarnate.

But "the past" is the antithesis of change. Once made into a pie, it is no more possible for that apple to change in any other way. If change is time, then the past must be devoid of it, for no past event is mutable.

By that same thread, we might say that future as also devoid of time...why?