Historical clue formulations

• Millennium start — 2021-09-05
• Start of the third millennium — 2021-04-01
• Year the Office of Homeland Security was created — 2018-12-30
• Copyright year for "Shrek" and "Monsters, Inc." — 2017-01-05
• The year 2001 — 2016-12-19
• Year that "Shrek" and "Zoolander" came out — 2014-10-05
• Year the iPod came out — 2013-06-30
• Year that "Shrek" and "A Beautiful Mind" came out — 2013-03-17
• Start of the 21st century — 2006-06-20
• Year of Bush's swearing-in — 2002-11-06
• When George W. Bush was sworn in — 2002-06-02
• Millennium start — 2002-04-10
• Noted film, as old Romans would have it — 2001-11-21
• New millennium year, or a part of 20-, 37- and 49-Across — 2001-01-01
• Famous movie year — 2000-05-28
• Year in a Roman sci-fi film? — 1996-04-20
• 2,001, to Ovid — 1995-04-10
• Third-millennium year — 1994-06-22