Historical clue formulations

• Alert about a crime, say — 2024-06-10
• Beginning in basketball — 2013-04-24
• Start of a basketball game — 2012-12-16
• Telltale sign — 2010-03-09
• Give insider info — 2008-06-22
• Warn — 2001-03-29
• Alert — 1997-03-02