Hello, the credit card repayment date is extended 18 days on the basis of the credit card billing date. The billing date of a credit card is fixed. If you need to make changes, you can call the bank credit card hotline to make changes. For example, if the monthly bill date of your credit card is 1, then the last repayment date of your credit card in that month is 19, and the credit card bill sent by the bank will also have the last repayment date.