CREATE TABLE table_78515 ("Date" CLOB, "Visiting Team" CLOB, "Final Score" CLOB, "Host Team" CLOB, "Stadium" CLOB)

Tell me the date for pittsburgh steelers
SELECT "Date" FROM table_78515 WHERE "Visiting Team" = 'pittsburgh steelers'
SELECT "Date" FROM "table_78515" WHERE "Visiting Team" = 'pittsburgh steelers'