CREATE TABLE table_8926 ("Year" FLOAT, "Date" CLOB, "Winner" CLOB, "Result" CLOB, "Location" CLOB)

What is Date, when Location is Polo Grounds, when Winner is Philadelphia Eagles, and when Year is 1948?
SELECT "Date" FROM table_8926 WHERE "Location" = 'polo grounds' AND "Winner" = 'philadelphia eagles' AND "Year" = '1948'
SELECT "Date" FROM "table_8926" WHERE "Location" = 'polo grounds' AND "Winner" = 'philadelphia eagles' AND "Year" = '1948'