Historical clue formulations

• When many parks close — 2026-09-06
• Time when streetlights turn on — 2025-09-17
• Call it an early night? — 2025-02-25
• Owl-light — 2023-05-05
• Twilight time — 2022-03-01
• Twilight time — 2019-02-25
• Closing time for many city parks — 2016-07-12
• You might call it an early night — 2015-06-12
• Period just before dark — 2014-02-10
• When car headlights get turned on — 2013-04-03
• Dawn's opposite — 2010-01-25
• *End — 2008-05-15
• Nightfall — 2007-09-10
• The edge of night — 2004-04-07
• Gloaming — 2003-04-10
• Evening — 2001-08-19