According to the inquiry of credit card network, the validity period of postal currency card can be found on the front of the card, and the validity period of single-chip card (not bank card with integrated magnetic stripe and chip) is one line below the card number, which is indicated by "month/year", and 05/25 is valid before May 2025. The validity period of a credit card is marked on the front of the card, below the card number, and consists of four Arabic numerals in the form of "MM/YY". The first two digits are the expiration month and the last two digits are the expiration year.