I haven’t read One Day the book, so I didn’t know not to expect a Same Time, Next Year sort of gimmick.
Even the story's conceit is shoddy: Unlike its precursor (1978's Same Time, Next Year), this couple doesn't necessarily need an annual face-to-face encounter.
On the other hand... Reel Thoughts: A Blue Valentine (That People Will Actually Want to Watch): From Same Time, Next Year to (500) Days of Summer to last year’s brutal Blue Valentine, films that unfold on timelines are fascinating, because you get to see the characters change, sometimes radically, from date to date.
Nicholls' charming novel had a Same Time, Next Year?style premise, checking in on Dex and Em every single July 15 for 20 years, wherever they might be on that day; in adapting his book for the screen, Nicholls skips some years and does some compression of events.
From Same Time, Next Year to (500) Days of Summer to last year’s brutal Blue Valentine, films that unfold on timelines are fascinating, because you get to see the characters change, sometimes radically, from date to date.