CREATE TABLE table_43572 ("Result" CLOB, "TUF Competitor" CLOB, "Opponent" CLOB, "Method" CLOB, "Event" CLOB, "Date" CLOB)

when is the opponent lyoto machida?
SELECT "Date" FROM table_43572 WHERE "Opponent" = 'lyoto machida'
SELECT "Date" FROM "table_43572" WHERE "Opponent" = 'lyoto machida'