For example, the bill date on the 3rd, the bill on April 3rd, the repayment date is April 2nd1,and the bill on April 3rd includes the consumption from March 3rd to April 2nd. The earliest consumption is March 3, and this consumption can enjoy the longest interest-free period (5 1 day);

The shortest interest-free period is 18 days, such as the bill on April 3, the repayment date is April 2 1, and the bill on April 3 includes the consumption from March 3 to April 2. The latest consumption was April 2nd, and this consumption can enjoy the shortest interest-free period (19 days).

According to this model, we can calculate the consumption on other dates and the interest-free period that we can finally enjoy. Of course, the situation here does not include cash withdrawal, because there is no interest-free period for cash withdrawal, and interest of five ten thousandths is charged every day.