Historical clue formulations

• Hit in the head — 2024-06-01
• Conked with a pitch — 2012-01-31
• Knocked on the noggin — 2012-01-01
• Knocked dizzy — 2009-05-10
• Knocked on the noggin — 2005-11-17
• Hit by a pitch — 2002-11-01
• Conked — 2000-08-30
• Conked — 1998-11-08
• Hit on the head — 1996-02-11