You can look at the label on the back of the can. Generally, cans can be stored for about one or two days after being opened. Unopened cans can be stored at room temperature. Because canned food is sterilized food, it no longer contains pathogenic bacteria and bacteria that can reproduce at room temperature. If the can is opened and not consumed, it should be stored under refrigerated conditions, and the storage time should generally not exceed three days.

According to the regulations of the China Light Industry Association, the validity period of canned foods such as tomato juice, juice, tomato products, fruits and vegetables is two years. The validity period of canned pork, canned beef, canned mutton, canned poultry, canned frying and canned jam is 3 years. The period of canned meat, poultry and fish produced in metal cans and glass cans is not less than 24 months. Canned fruits, vegetables, wheat and pasta not less than 15 months old.