One convenience-store chain in the Kanto area checks for expiry dates three times a day, at 12 a.m., 9 a.m. and 4 p.m. Items such as rice balls and sandwiches that are fresh for 24 hours or less are thrown out if they come within two hours of their use-by limit. Bread whose expiry date is set several days away is discarded 24 hours before the expiry date, while milk is thrown out four days in advance. In this way, stores designate "pull dates" for various products. Little difference is seen between major convenience store chains. "We do this because we're taking into consideration the period in which the products will actually be consumed after they are taken home," explains an official from the Kanto convenience store. As a rule the store is not permitted to discount products approaching their expiry date in the same way as supermarkets do.