(1) If you are forgetful or spend conservatively, you'd better set the repayment dates of the two cards on the same day, which is convenient and quick. If the payday is roughly determined, let the repayment date be within a few days after the payday, such as 15-20, and the repayment date is 25th. Note: I said the repayment date, and the billing date should be adjusted accordingly.

(2) Good memory. You can make the billing dates of two cards differ by 15 days, such as card A No.2, card B 17 and 2- 16 every month, and swipe card A (these accounts are all booked on the 2nd of next month); The following month,No. 17-No.1, swipe the B card (these accounts are recorded in No next month 17). This can get the longest interest-free period. For example, today is 1 1. If a card is swiped, it will be recorded on the accounting day of next month. Otherwise, if you swipe your B card, it will be deducted to the billing date of this month 17.