Historical clue formulations

• Like 666, popularly — 2026-08-30
• Like the Devil — 2020-06-14
• Mephistophelian — 2019-07-25
• Hellish — 2017-02-25
• Infernal — 2011-02-27
• Black, in a way — 1995-01-15
• Like Rushdie's verses — 1994-04-20