1. The term of validity of a treaty, contract, etc.

2. The quality can meet the specified requirements under the specified storage conditions.

3. The expiry date of a drug refers to the period during which the quality of the drug can meet the specified requirements under the specified storage conditions. Time required for 1% loss of efficacy. If the expiration date is stipulated as December 22, it means that the drugs produced in this batch will still be valid until December 31, 22.