The 26th of that month. According to the information published by the credit card network, the billing date of Zheshang Bank's credit card is 1 day per month, and the due repayment date is 26th of the current month, so you can enjoy interest-free repayment for up to 56 days. The interest-free repayment period is from the bookkeeping date to the due repayment date. The longest interest-free period of Zheshang Bank credit card is 56 days, and the shortest is 25 days. The interest-free period is different on different credit card dates, and the longest interest-free period can be enjoyed on the day after the bill.