CREATE TABLE table_55421 ("Home team" CLOB, "Home team score" CLOB, "Away team" CLOB, "Away team score" CLOB, "Venue" CLOB, "Crowd" FLOAT, "Date" CLOB)

What day did Footscray play as the away team?
SELECT "Date" FROM table_55421 WHERE "Away team" = 'footscray'
SELECT "Date" FROM "table_55421" WHERE "Away team" = 'footscray'