CREATE TABLE table_16667 ("Round" FLOAT, "Grand Prix" TEXT, "Date" TEXT, "Location" TEXT, "Pole Position" TEXT, "Fastest Lap" TEXT, "Winning Driver" TEXT, "Winning Constructor" TEXT, "Report" TEXT)

What is the date of the circuit gilles villeneuve?
SELECT "Date" FROM table_16667 WHERE "Location" = 'Circuit Gilles Villeneuve'
SELECT "Date" FROM "table_16667" WHERE "Location" = 'Circuit Gilles Villeneuve'