Historical clue formulations

• Clock-changing time, for daylight saving time — 2022-12-04
• D.S.T. starting time ... or a hint to 42-Across — 2022-08-07
• Wee hour — 2019-02-23
• Time in Manhattan when it's midnight in Montana — 2017-04-24
• When bars close in Boston — 2014-09-13
• Bar closing time, perhaps — 2010-11-03
• When daylight saving begins: Abbr. — 2010-07-04
• Bar closing time, often — 2009-09-02
• Wee hour — 2009-06-25
• Time to close a bar, maybe — 2007-12-20
• Graveyard shift time — 2006-06-15