From the 4th to the 28th. According to official website of Guangfa Bank, Guangfa Bank collects accumulated outstanding principal, cash withdrawal transaction principal and handling fee for consumer transactions. The date when the interest is settled for the cardholder every month and the amount payable by the cardholder is calculated. The billing date is fixed, based on the date of birth filled in the credit card application form (birthday 29/30/3 1, and the system is randomly configured from 4 to 28). See the bill prompt for details.