Historical clue formulations

• When middle watch ends — 2018-08-19
• Closing hour for most N.Y.C. bars — 2011-05-03
• End of a middle watch — 2008-12-26
• Graveyard shift time — 2007-11-25
• When some newspapers are delivered — 2003-09-28
• Early time to arise — 2002-01-14