CREATE TABLE table_24057 ("Episode" TEXT, "Broadcast date" TEXT, "Run time" TEXT, "Viewers  ( in millions ) " TEXT, "Archive" TEXT)

Name the broadcast date for 6.0 viewers
SELECT "Broadcast date" FROM table_24057 WHERE "Viewers (in millions)" = '6.0'
SELECT "Broadcast date" FROM "table_24057" WHERE "Viewers (in millions)" = '6.0'