Correct me if i'm wrong, but you're all speaking about time like it's a global value. What about the black holes and super high speeds? Those things prove that time is relative. And it can be 'frozen', f.e. teoretically inside of a black hole there's no time at all(not sure, read about it long ago). So my 4-dimesnional model of world looks like this - at any spot of 3dimensional space there's an unique 'time_factor', not essentionally equal to 1. If we assume this, i think that this 'time_factor' can also be negative, producing reversed time effect. Enough of this, i'm starting to feel weird