user: Question: What is Date, when Location is Polo Grounds, when Winner is Philadelphia Eagles, and when Year is 1948?
Columns: ['Year', 'Date', 'Winner', 'Result', 'Location']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1940.0, 'September 28', 'New York Giants', '20-14', 'Connie Mack Stadium']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Location" = 'Polo Grounds' AND "Winner" = 'Philadelphia Eagles' AND "Year" = 1948.0;