CREATE TABLE table_40013 ("Date" TEXT, "Score" TEXT, "Set 1" TEXT, "Set 2" TEXT, "Set 3" TEXT, "Set 4" TEXT, "Set 5" TEXT, "Total" TEXT)

When was set 3 of 18-25?
SELECT "Date" FROM table_40013 WHERE "Set 3" = '18-25'
SELECT "Date" FROM "table_40013" WHERE "Set 3" = '18-25'