CREATE TABLE table_42178 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

When was the winning score 6 (69-69-73-71=282)?
SELECT "Date" FROM table_42178 WHERE "Winning score" = '−6 (69-69-73-71=282)'
SELECT "Date" FROM "table_42178" WHERE "Winning score" = '−6 (69-69-73-71=282)'