Timescape, also called Grand Tour: Disaster in Time. It was from 1992, although it certainly sounds more like a 70s movie. The movie was based on “Vintage Season”.
Nailed it. Now to find a copy.
“Vintage Season” has appeared in many anthologies, as can be seen here http://www.isfdb.org/cgi-bin/title.cgi?59665. You can probably find one of those anthologies in your public library. If you wanted to buy one, I would suggest Two Handed Engine The Selected Stories of Henry Kuttner and C.L.Moore, which also contains many other excellent stories.
Thanks, I checked my local library and used book store and came up empty, although to be honest, the used bookstore is a mess, you could spent half the day in there and not be sure.
You can read Vintage Season online in this short story collection:
Ninjaed; here is another link (the Internet Archive has Astounding Science Fiction):