[Theorsell]

Nonexistence is isomorphic to the set of all self-consistent possibilities. That's why the universe is simultaneously everything and nothing. Time is entropy, random movements that tend toward certain patterns more than others, like DNA tends to grow life even though it moves left equally often as it moves right. There's no such thing as time at the deepest level. In physics they say this as "time symmetry".

If everything is impermanent,what was there before voidness? The void is "Nonexistence is isomorphic to the set of all self-consistent possibilities." Your question doesn't make sense because time is 1 of an infinite number of patterns inside those possibilities.

Depending on what direction through the infinite possibilities you look, any event in the future (or other patterns of reality) has already happened, since there is some path between every part of the universe and every other part.