The date on the credit card is the validity period of the credit card. The validity period of the credit card is expressed in month/year. 05/20 is valid until May 2020. The validity period of a credit card is generally 3 years, and some banks' credit cards have a validity period of 5 years. After the validity period expires, the bank will decide whether to allow the customer to continue to use the credit card based on the customer's past use of the credit card. The validity period of the credit card design is for the healthy use of the credit card. It provides a staged rating to the credit card users to ensure the healthy use of bank funds and timely recovery.