CREATE TABLE table_39070 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Game site" TEXT, "Record" TEXT, "Attendance" TEXT)

On what date was the game at Lincoln Financial Field?
SELECT "Date" FROM table_39070 WHERE "Game site" = 'lincoln financial field'
SELECT "Date" FROM "table_39070" WHERE "Game site" = 'lincoln financial field'