For most young adults in the United States, turning 21 means finally being able to grab a beer with your friends, but for the men in the Lake family, it means something much more. Domhnall Gleeson stars opposite of Rachel McAdams in this sappy British rom-com about a young man's ability to travel back in time and alter his past. Tim uses this as a chance to finally land the girl of his dreams on New Year's Eve, and it works. However, as the two of them begin to build a life together, Tim realises there are some things his special ability can't change.