Historical clue formulations

• When some lunches end — 2019-03-19
• When clocks are set back for the end of daylight saving time — 2013-07-13
• When many bars close — 2013-03-03
• When some lunches end — 2012-07-29
• When four bells ring on the middle watch — 2009-04-18
• When one might have a late lunch — 2007-02-08