CREATE TABLE table_37558 ("Outcome" CLOB, "Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Partner" CLOB, "Opponents" CLOB, "Score" CLOB)

Which Date has a Tournament of bmw open?
SELECT "Date" FROM table_37558 WHERE "Tournament" = 'bmw open'
SELECT "Date" FROM "table_37558" WHERE "Tournament" = 'bmw open'