Historical clue formulations

• King Arthur's home — 2019-05-13
• Broadway hit with the song "I Wonder What the King Is Doing Tonight" — 2014-04-19
• Period about a decade before the 34-Down — 2010-12-18
• Musical based on a T. H. White novel — 2008-01-23
• The Kennedy years, figuratively — 2004-08-31
• King Arthur's home — 2000-07-31
• "The Once and Future King" setting — 1996-09-29
• "Idylls of the King" setting — 1995-12-29
• Musical based on "The Once and Future King" — 1995-03-27