CREATE TABLE table_66949 ("Date" TEXT, "Visiting Team" TEXT, "Final Score" TEXT, "Host Team" TEXT, "Stadium" TEXT)

When was the game at Gillette Stadium that ended in a final score of 30-17?
SELECT "Date" FROM table_66949 WHERE "Final Score" = '30-17' AND "Stadium" = 'gillette stadium'
SELECT "Date" FROM "table_66949" WHERE "Final Score" = '30-17' AND "Stadium" = 'gillette stadium'