Historical clue formulations

• Hinging (on) — 2023-12-31
• Hanging (on) — 2009-06-06
• Self-___ — 2005-02-05
• Self-___ — 2003-04-26
• Dependent — 2000-09-29
• Trustful — 1998-01-20
• Counting (on) — 1997-02-20
• "Star Trek II" ship — 1996-11-09