Historical clue formulations

• A "lousy teacher," per Bill Gates — 2019-10-12
• Favorable outcome — 2019-04-03
• Something said to smell sweet — 2018-07-19
• "I did it!" — 2012-12-29
• Good outcome — 2010-01-17
• "Eureka!" — 2000-01-16
• Hit — 1998-09-06