user: Question: What date has a competition of 2012 AFC Challenge Cup, and Dasarath Rangasala Stadium, Kathmandu as the venue?
Columns: ['Date', 'Venue', 'Score', 'Result', 'Competition']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['16 February 2006', 'Bahrain National Stadium , Manama', '2–0', '2–0', 'Friendly']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Competition" = '2012 AFC Challenge Cup' AND "Venue" = 'Dasarath Rangasala Stadium, Kathmandu';