CREATE TABLE table_3482 ("Episode #" FLOAT, "Series #" FLOAT, "Title" TEXT, "Director" TEXT, "Writer" TEXT, "Original airdate" TEXT, "Viewers  ( in millions ) " TEXT)

What is the original airdate of the episode that had 8.23 million viewers?
SELECT "Original airdate" FROM table_3482 WHERE "Viewers (in millions)" = '8.23'
SELECT "Original airdate" FROM "table_3482" WHERE "Viewers (in millions)" = '8.23'