"Days of Future Past" is a storyline in the Marvel Comics comic book The Uncanny X-Men issues #141–142, published in 1981. It deals with a dystopian future in which mutants are incarcerated in internment camps. Wikipedia
Originally published: 1981
Author: Chris Claremont
Number: Earth-811
Genre: Superhero
Graphic novel: ISBN 0871355825
Inker(s): Terry Austin