CREATE TABLE table_8168 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Ground" TEXT, "Date" TEXT, "Crowd" FLOAT)

What date was the away team from Adelaide?
SELECT "Date" FROM table_8168 WHERE "Away team" = 'adelaide'
SELECT "Date" FROM "table_8168" WHERE "Away team" = 'adelaide'