For example, the bookkeeping date is 10, and the due repayment date is 28. Generally speaking, if the customer consumes on August 9, the bill is issued on August 10, and the repayment is required on August 28, so the interest-free period is the shortest; If the customer spends money in August 10, the bill will not be issued until September 10, and the repayment on September 28 has a maximum interest-free period of 50 days. That is, customers can enjoy the longest interest-free period if they repay all the amount due before the due repayment date (inclusive).
In other words, when you receive the bill, you can see a "due repayment date" before which you can pay off the overdraft. Failing to pay it back within the time limit will result in late fees and interest, which will affect personal credit.