Old Geezers, The Gateway

Three bored old men living in New Los Angeles want something to do. Nothing in their lives is interesting or even the slightest bit dangerous. After they discover a time machine buried in the remains of what used to be LA, all this changes.
The man who built the machine is not overly impressed, either. He has his own plans for a new world - which does not include them living. Time is short; much shorter than they could possibly imagine.

The first of four adventures for my blundering world wreckers if they get away with it...