Historical clue formulations

• "It's not coming to me" — 2023-03-05
• Blacksmith's workplace — 2019-05-09
• "Hmm ... it's escaping me" — 2017-06-18
• "Hmm, can't remember" — 2014-08-26
• "Hmmm, it's not coming to me" — 2000-02-23
• "Slips my mind" — 1999-12-08