The expiration date is defined as: 45 days before the expiration date if the shelf life of the product exceeds one year; If the shelf life is more than half a year but less than one year, 20 days before the expiration date; If the shelf life is more than 90 days but less than half a year, it shall be 15 days before the expiration date; If the shelf life is more than 30 days and less than 90 days, it shall be 10 days before the expiration date; If the shelf life is more than 16 days and less than 30 days, it shall be 5 days before the expiration date; If the shelf life is less than 15 days, it will be 1 4 days before the shelf life.

The date of taking off the shelf is calculated as follows: (1) If the shelf life is less than one month, the commodity department must take off the shelf 1 in advance;

(two) if the shelf life is less than six months, the commodity department should take back the shelf five days in advance;

(3) If the shelf life is less than one year, the commodity department will take it off the shelf 10 in advance;

(4) If the shelf life exceeds one year, the commodity department will take it off the shelf 15 in advance;

(5) If the manufacturer has other processing time requirements, the rack shall be dismantled on the date agreed by the manufacturer.