CREATE TABLE table_7642 ("Date" CLOB, "Tournament" CLOB, "Winning score" CLOB, "To par" CLOB, "Margin of victory" CLOB)

On what Date is the Winning Score 71-69-68-70=278?
SELECT "Date" FROM table_7642 WHERE "Winning score" = '71-69-68-70=278'
SELECT "Date" FROM "table_7642" WHERE "Winning score" = '71-69-68-70=278'