CREATE TABLE table_42440 ("Outcome" TEXT, "Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Partner" TEXT, "Opponent in the final" TEXT, "Score in the final" TEXT)

What outcome has September 23, 2013 as the date?
SELECT "Outcome" FROM table_42440 WHERE "Date" = 'september 23, 2013'
SELECT "Outcome" FROM "table_42440" WHERE "Date" = 'september 23, 2013'