Historical clue formulations

• Any "Jr.," to his father — 2022-06-27
• Junior, e.g. — 2012-08-03
• First son, sometimes — 2012-04-27
• Junior, to Senior — 2003-12-04
• One handled the same way? — 2003-05-30
• Elizabeth II, to Elizabeth I — 2001-06-11
• Son, sometimes — 1999-11-14