I remember seeing a movie when I was young (around late 80s) about a couple of astronauts returning to Earth. They either had some kind of an accident or fluke as there was some sort of time travel going on (or maybe parallel universe?) and they returned to a future Earth. (Note, future as in present day, like traveling from the 60s to 80s, not futuristic scifi-movie type future.)
I can't remember if there was any huge post-apocalyptic stuff but I remember at least two male astronauts walking in a desert and finding a can of coca-cola and going something like "at least we know we are in America" but they had never seen (aluminium) cans before and then they wondered what the can was made of as "it's too light to be metal" or something similar.
I remember enjoying the movie but sadly this is all the info I can remember.
It is NOT the following:
Strange New World