Historical clue formulations

• One-millionth of a meter — 2024-04-26
• *Onetime White House nickname — 2017-03-30
• One-millionth of a meter — 2016-05-31
• Distance light travels in 3.3 femtoseconds — 2009-08-01
• Teeny-tiny distance — 2007-05-22
• Minuscule unit — 2003-01-25
• One-millionth of a meter — 1996-05-12
• One-millionth of a meter — 1994-10-10