Historical clue formulations

• First, second or third — 2025-12-13
• It's part of a series — 2019-10-18
• Part of many a street name — 2018-06-02
• Second, e.g. — 2009-06-20
• 1st or 2nd, e.g. — 2007-07-25
• Fifth, e.g. — 2005-01-14
• First, second, or third, e.g. — 2000-12-18
• Second, e.g. — 1999-02-07
• 21st, e.g. — 1996-03-31
• Number in a series — 1995-10-04