CREATE TABLE table_11423 ("Home team" CLOB, "Home team score" CLOB, "Away team" CLOB, "Away team score" CLOB, "Venue" CLOB, "Crowd" FLOAT, "Date" CLOB)

When was the game at Collingwood?
SELECT "Date" FROM table_11423 WHERE "Away team" = 'collingwood'
SELECT "Date" FROM "table_11423" WHERE "Away team" = 'collingwood'