CREATE TABLE table_45421 ("Game" TEXT, "Date" TEXT, "Home team" TEXT, "Result" TEXT, "Road team" TEXT)

On what date did Portland play game 5 at home?
SELECT "Date" FROM table_45421 WHERE "Home team" = 'portland' AND "Game" = 'game 5'
SELECT "Date" FROM "table_45421" WHERE "Game" = 'game 5' AND "Home team" = 'portland'