The final repayment date of BOC credit card is the 20th day after the bill date. The accounting date is 23rd (fixed), that is to say

Generate bill 2.23 to record the transactions during the period of 1.24-2.23, and the final repayment date of the transactions during this period is the 20th day after 2.23, that is, 3. 15.

Generate bill 3.23 to record the transactions from February 24th to March 23rd, and the final repayment date of the transactions during this period is the 20th day after March 23rd, that is, 4. 12.

And so on.

Obviously, the shortest interest-free period is 20 days (2.23 brush, 3. 15 times) on the billing date, and the longest interest-free period is 50 days (3.24 brush, 4. 12 times) on the first day after the billing date. It should be noted that credit card consumption has an interest-free period, and cash withdrawal has no interest-free period.