Historical clue formulations

• Growing season — 2023-07-23
• Symbol of rebirth — 2019-11-08
• Spa, e.g. — 2016-11-27
• Seminal 1962 book on the environment — 2014-07-10
• One of the four seasons — 2013-04-23
• Oasis, often — 2012-09-30
• Time for a break — 1999-03-12
• Subject of many an ode — 1996-01-18
• Leaving time? — 1995-12-10