First, credit cards are generally consumed on the bill date, with the shortest interest-free period; \x0d\ 2。 You can enjoy the longest interest-free period if you spend on the day after the bill date; \x0d\ For example, the billing date of Industrial Credit Card is the 20th of each month, and the repayment date is 10 of each month, so if the bill is consumed on September 20th, it must be repaid before June 10, so that the interest-free period is the shortest; \x0d\ If it is spent on September 2 1 day, it belongs to the bill of June 20 10, and should be repaid before June 1 10, so that you can enjoy the longest interest-free period.