Historical clue formulations

• "It is what it is," e.g. — 2023-02-26
• "What's past is past," e.g. — 2018-03-09
• "It is what it is," e.g. — 2015-05-17
• Obvious statement — 2009-09-06
• Platitude — 2009-08-23
• Statement of the obvious — 2001-02-21
• Obvious fact — 1995-06-20
• Cliche-in-the-making — 1994-06-05