The title says it all, but it's about happiness and love, too

Rating: 9/10 (16 May 2014)

It is very difficult not to like a starring Bill Nighy, even the crappy ones get an extra star at least just for featuring him, but About Time is also written by Richard Curtis, of Love Actually fame, so there is only a tiny tiny chance the movie would not be good. And then Rachel McAdams plays in it, too, making it an instant hit. So like other reviewers here, I don't understand people implying they didn't like the movie (I've just scientifically demonstrated that is impossible).
Time travel films are usually about two things: alternate history and second chances. Alternate history is just a plot device for telling a science fiction story in a familiar environment, while second chances films almost always talk about fixing past mistakes, avoiding regret, enjoying life. This makes About Time more amazing, because it is actually almost devoid of the quasi-religious platitudes relating to regret, guilt and consequences. It is about enjoying life, it is about enjoying your friends and your family, if you are lucky enough to have enjoyable ones, like the dude in the film. It is about enjoying Rachel McAdams, too, but that shouldn't be too difficult.
Bottom line: a bit long at two hours and also having little to do with exploring the awesome power of time travel. However it is a very pleasant romance and family movie, with good solid humour, but without trying to be a comedy, and it is not one of those horrid Christmas ghost things, either. Luckily for us, the lead character was a very nice guy, as was his father, and he didn't consider living his life, then taking it from the start all over again, with other people, other children, other hours of watching... I recommend it.