CREATE TABLE table_29796 ("No ( s ) . in series" FLOAT, "No ( s ) . in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code ( s ) " FLOAT, "U.S. viewers  ( millions ) " TEXT)

What was the broadcast date of episodes that were watched by 23.2 million viewers?
SELECT "Original air date" FROM table_29796 WHERE "U.S. viewers (millions)" = '23.2'
SELECT "Original air date" FROM "table_29796" WHERE "U.S. viewers (millions)" = '23.2'