I watched a really good program about time.
Anyway, Einstein theory says that time is like a dimension like space. So the future, past and present are already real. What I mean real is like how space or distance is real in the sense that point doesn't go away if you move towards a point or away from a point. In this case time is a fixed dimension and we have no free will, we are just following a path through space time.
However, Einstein theory doesn't go well with something called Quantum mechanics, which is probabillistic. Although without a current theory of everything its hard to say what time actually is. However, some people believe time is discrete i.e. you can't chop it up into infinite pieces.
This gives way to a model of time being like a sand glass where time is being created when we move forward, by all the little pieces of time that add up.
Saying that John Conway proved that if humans have free will then so do elementary particles http://en.wikipedia.org/wiki/Free_will_theorem , so even if the universe not determined like a fixed dimension and you believe in free will, you will have to agree that atoms have free will.
Anyway, I wonder what time actually is.
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