The bank will record the transactions in a certain period of time and generate a bill on a certain day for both parties to reconcile. This day is the accounting day, and the accounting day is a fixed day every month.

The final repayment date of BOC credit card is the 20th day after the bill date. The accounting date is 6 days (fixed), that is,

Generate a bill 10.6, and record the transactions during September 7th-10.6. The final repayment date is the 20th day after 10.6, that is, 10.26.

Generate a bill 1 1.6, and record the transactions during the period of10.7-1.6. The final repayment date is/kloc on the 20th day after1.6.

And so on.

Obviously, 10.6 has the shortest interest-free period of 20 days on the billing date (10.6 and 10.26), and 10.7 has the longest interest-free period of 50 days on the first day after the billing date (10.7 and/kloc) It should be noted that credit card consumption has an interest-free period, and cash withdrawal has no interest-free period.