Historical clue formulations

• Himalayan capital, as it's sometimes spelled — 2023-05-03
• Asian capital — 2014-06-14
• Capital of Nepal — 2010-09-15
• Gurkha conquest of 1768 — 2000-08-25
• Himalayan capital — 1999-07-27
• Nepalese capital — 1997-10-02
• Capital of Nepal — 1994-10-20