The night after another unsatisfactory New Year party, Tim's (Domhnall Gleeson) father (Bill Nighy) tells his son that the men in his family have always had the ability to travel through time. Tim can't change history, but he can change what happens and has happened in his own life - so he decides to make his world a better place...by getting a girlfriend (Rachel McAdams). But as his unusual life progresses, Tim finds out that his unique gift can't...