CREATE TABLE table_54230 ("Year" FLOAT, "Date" TEXT, "Winner" TEXT, "Result" TEXT, "Loser" TEXT, "Location" TEXT)

What is the date where the winner was the Oakland Raiders in 1975?
SELECT "Date" FROM table_54230 WHERE "Year" = '1975' AND "Winner" = 'oakland raiders'
SELECT "Date" FROM "table_54230" WHERE "Winner" = 'oakland raiders' AND "Year" = '1975'