Possible Duplicate:
Looking for an old SF tv short story about blue men staging the future
A guy suddenly jumps into the future, and sees some workers prepearing the reality out of nothing for the people that comes from the past.
It could be late 80s or early 90s, it was in full color.
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
Not exactly what you describe, but I bet you mean an episode from the Twilight Zone: A Matter of Minutes.
The couple of protagonists are "stuck" in time and get to see the workmen who tear down the world once it's in the past, and who rebuild it in the future.
If you remember blue workmen, this is it.
Possibly related Miniseries from 1995: The Langoliers.
