user: Question: When was the Masters Tournament?
Columns: ['Date', 'Tournament', 'Winning score', 'To par', 'Margin of victory', 'Runner(s)-up']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['21 Jan 2001', 'Alfred Dunhill Championship 1', '67-66-65-69=267', '–21', '1 stroke', 'Justin Rose']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Tournament" = 'Masters Tournament';