CREATE TABLE table_31659 ("Date" TEXT, "Result" TEXT, "Opponent" TEXT, "Method" TEXT, "Round" FLOAT)

When did the technical knockout against Fatu Tuimanono happen?
SELECT "Date" FROM table_31659 WHERE "Method" = 'technical knockout' AND "Opponent" = 'fatu tuimanono'
SELECT "Date" FROM "table_31659" WHERE "Method" = 'technical knockout' AND "Opponent" = 'fatu tuimanono'