【明報專訊】Often do readers of a novel complain its movie adaptation fails to do it justice. One Day (《情約一天》), adapted from a popular novel under the same title by David Nicholls, may be an exception because Nicholls himself wrote the screenplay. Viewers can rest assured that the movie would communicate his messages. Indeed, the romance fits the parameters of an engaging love story, providing viewers with quite a powerful emotional experience.