Historical clue formulations

• What always has time on its hands — 2023-07-02
• Midnight to 4 a.m., at sea — 2011-12-15
• Keep an eye on — 2010-09-20
• Wrist timer — 2007-07-24
• "Let me demonstrate …" — 2005-06-08
• Band instrument? — 2002-03-17
• Do guard duty — 1994-05-05