The landlord's bookkeeping date is the 7th of each month, so transactions such as credit card consumption and cash withdrawal from the 8th of each month to the 7th of the following month will be recorded in the 7th of the following month, forming a bookkeeping cycle, and the repayment date after 20 days of bookkeeping is the 27th of each month.

Furthermore, I want to give some advice to the landlord. The closer the general bill is to the future bill date, the longest repayment period can be enjoyed (that is, the interest-free period mentioned by the bank, as long as the landlord repays in full according to the amount written on the bill, no interest will be charged for the credit card). Specifically, in the case that the bill date is 7th, assuming that the landlord swipes the card 1/8, then this credit card is settled by 2/7 bill. If you swipe your card at 1/9, the bill settlement is 2/7, the due date is 2/27, the repayment period is 49 days, and so on. 2/7 credit card, checkout on the same day, 2/27 receipt, so there is only a 20-day repayment period.