CREATE TABLE table_50844 ("Tie no" CLOB, "Home team" CLOB, "Score" CLOB, "Away team" CLOB, "Date" CLOB)

What is the date when Aston Villa is the away team?
SELECT "Date" FROM table_50844 WHERE "Away team" = 'aston villa'
SELECT "Date" FROM "table_50844" WHERE "Away team" = 'aston villa'