CREATE TABLE table_32458 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What is the date of the game where Essendon is the away team?
SELECT "Date" FROM table_32458 WHERE "Away team" = 'essendon'
SELECT "Date" FROM "table_32458" WHERE "Away team" = 'essendon'