Historical clue formulations

• Plot feature of "Planet of the Apes" — 2026-09-13
• Science fiction concept depicted three times in this puzzle — 2023-11-30
• Subject of the Jake Gyllenhaal movies "Donnie Darko" and "Source Code" — 2023-06-02
• Move to a later date, say — 2020-11-28
• Not live in the present? — 2018-11-23
• Basis of the Doctor's adventures on "Doctor Who" — 2017-08-11
• "Back to the Future" subject — 2008-02-20