The bill date is the day you receive the bill, which is a summary of your consumption last month, and you only need to pay it off before the 20th of the next month. I set up the No. 1 bill and pay it off around the 25th, which is relatively clear. In fact, as long as you know that you swipe your card for consumption in September, and then pay it back before October 20, it will be fine. Then as long as the card is swiped after the billing date, it belongs to the next month, that is, it will be paid on the 20th of the next month.