Historical clue formulations

• Still awake after midnight, say — 2024-10-15
• Watching TV after midnight, say — 2020-03-28
• Pulling an all-nighter, e.g. — 2014-03-12
• Burning the midnight oil — 2014-01-02
• Watching Letterman or Conan, say — 2009-07-18
• Burning the midnight oil — 2007-06-30
• Still awake at 1 a.m., say — 2005-10-03
• Burning the midnight oil — 2003-12-07
• Burning the midnight oil — 2001-05-10
• Burning the midnight oil, so to speak — 1999-07-11
• Working through the night — 1996-10-05