Historical clue formulations

• Commencement — 2025-09-20
• Outset — 2025-06-16
• Very beginning — 2024-06-06
• Very beginning — 2021-04-06
• Outset — 2020-08-11
• Beginning, informally — 2018-05-10
• Beginning, informally — 2013-05-06
• First moment — 2013-04-13
• Square one, slangily — 2006-02-20
• Start — 2004-12-24
• Outset, slangily — 2003-03-15
• Very beginning — 2000-09-05
• Beginning, in slang — 1998-08-16