CREATE TABLE table_56990 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What is the date for home team Collingwood?
SELECT "Date" FROM table_56990 WHERE "Home team" = 'collingwood'
SELECT "Date" FROM "table_56990" WHERE "Home team" = 'collingwood'