The answer to these questions can be found on most food labels.
Open dates are calendar dates that are imprinted or stamped on a food label.
The date lets consumers know how long a product will remain fresh and safe. All package dates should be used as a guide, except expiration dates. Companies are not required to print dates on food packages. It is strictly a voluntary practice, except for baby foods. By law, all baby food and formula must carry an expiration date.