In which year was this episode of "The Simpsons" of which the episode "Days of Future Future" is a follow-up aired on the Fox network?
Days of Future Future:  The episode is a sequel to "Future-Drama" and a continuation of "Holidays of Future Passed", set 30 years from the present. Holidays of Future Passed:  It originally aired on the Fox network in the United States on December 11, 2011.
2011