The shortest interest-free period of postal credit card is 20 days, and the longest interest-free period is 50 days, depending on your card. As for the calculation method, let me give a simple example:

Suppose your billing date is 17 of a month, and the due repayment date (for example, 30th of each month) is 7th of next month (if the month is 3 1 day, it is 6th of next month, and the size of the month is calculated accordingly).

If you spend 65,438+00,000 yuan in April, 65,438+05, and this consumption is credited to your account on the same day, the bank bookkeeping date is April, 65,438+05, because your bookkeeping date is April, 65,438+07, and the due repayment date is May 7, 20 days after the bookkeeping date, this consumption has the longest interest-free period.

If you spend 65,438+00,000 yuan in April, 65,438+08, the consumption amount will be credited to your account on the same day, and the bank bookkeeping date will be April, 65,438+08. Since the consumption amount should be recorded on May 65, 438+07, there are still 50 days before the due repayment date on June 6, and the longest interest-free period of this consumption is 50.