CREATE TABLE table_30591 ("Version" CLOB, "Release" CLOB, "Release date" CLOB, "End of maintenance" CLOB, "Requirement" CLOB)

When's the end of maintenance in the august 11, 2013 release date?
SELECT "End of maintenance" FROM table_30591 WHERE "Release date" = 'August 11, 2013'
SELECT "End of maintenance" FROM "table_30591" WHERE "Release date" = 'August 11, 2013'