refers to the period of validity.

EXP? DATE is Expire? Short for date, generally refers to the period of validity, for example, EXP? DATE? DEC? 31 28 refers to the period of validity before December 31, 28.

Extended data:

Effective period; Effective date

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 expiry date is specified as December 22, it means that the drugs produced in this batch will still be valid until December 31, 22.

credit card expiration date

the expiration date of the credit card is clearly marked on the face of the credit card. The general standard of credit card expiration date is below the credit card number, and the standard format is the month before and the year after. For example, 9/11 means that your credit card is valid in September 211. Most credit cards issued by domestic banks are valid for three years.

Reference: Baidu Encyclopedia-expiration date