[CW maybe fictional suicide? WTF was that ending?!?!]
From what I remember Ashton Kutcher (?!? What ever happened to that guy?) stars as a guy who had terrible shit happen to him as a child, learns how to time travel, and so he time travels and fixed stiff in the past, but ends up just making shit worse. Then he travels back and becomes a fetus and dies?!?!
Wut.
At first I thought you were referring to the Sound of Thunder movie, so I was confused when your synopsis didn't include glowing praise of the lizard baboons.