My view of time is the infinite worlds theory that in every that anything could have happen does, therefore if you go back in time you will be on a different circle in time where you always went back in time, in that world line everything would be the same up until the point in time where you went back to, however both world lines would exist and what you do in the world line you are in would have no effect on the world line you left from. Just as there are world lines where nothing happened at all, instances of expanses where no matter ever was no big bang, simply absence. So there is no one point of start or stop, anything that can will has happened will happen begin, end, in any shape or form.
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