CREATE TABLE table_68493 ("Circuit" TEXT, "Location / State" TEXT, "Date" TEXT, "Winning driver" TEXT, "Team" TEXT)

what date did the m3 motorsport team compete at winton motor raceway?
SELECT "Date" FROM table_68493 WHERE "Team" = 'm3 motorsport' AND "Circuit" = 'winton motor raceway'
SELECT "Date" FROM "table_68493" WHERE "Circuit" = 'winton motor raceway' AND "Team" = 'm3 motorsport'