Historical clue formulations

• Pregnancy increments — 2024-09-12
• Gestational metric — 2024-02-04
• With 97-Across, back some time — 2015-08-23
• Vacation segments — 2006-04-04
• Rows on a calendar page — 2006-03-26
• Best-seller list heading — 2005-10-22
• Quite a while — 2001-06-17
• Calendar rows — 1994-10-22