In reply to Timmd:
> I'd imagine it's a theme which has been revisited in literature and films over the years.
Of course it is! I first encountered it in a wonderful short film approximately 3 years before Groundhog Day, and I'm sure sci-fi authors were playing with it in the 1950s (and at a stretch I bet someone can cite an "ancient" philosopher....)
So to slate one film for "rehashing" an idea from a film that was hardly original in its concept, is plain daft