Historical clue formulations

• Begins to feel real — 2025-06-19
• Takes root — 2024-10-26
• Becomes established — 2019-03-13
• Gets established — 2015-05-17
• Takes hold — 2013-01-08
• Becomes established — 2003-10-01
• Takes effect — 2003-04-07
• Arrives, as darkness — 1999-12-17
• Arrives — 1997-11-01