user: Question: What date was the opponent the Boston Yanks?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Record']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'September 24, 1948', 'Philadelphia Eagles', 'W 21-14', '1-0']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponent" = 'Boston Yanks';