According to the inquiry, I love the card network, the official card has an expiration date on the front, and there are 4 digits under the card number. The two figures are separated by a diagonal line. The first two digits are the month and the last two digits are the year. If it is still within the validity period, it can be used. Business cards are credit cards, all of which are valid for five years. After the expiration date, the business card cannot be used for external payment.