The interest-free period of China Merchants Bank’s credit card is 20---50 days. Please see the following detailed introduction for the specific algorithm: \x0d\ The "interest-free repayment period" is not the absolute sum of the card consumption date plus 50 days. The value is calculated based on the number of days between the consumption date and the billing date. The interest-free period will vary between 20 and 50 days. \x0d\　 How to swipe a China Merchants Bank credit card to get the longest interest-free period? If your bill date is the 7th and the repayment date is the 25th, if you spend 1,000 yuan on the bill date on December 7th, because the billing date is the 8th of the next day, your consumption on December 7th will be It appears on the bill on January 7th, and it can be paid back on January 25th at the latest. There is a 47-day interest-free period; \x0d\ But if you spend 1,000 yuan on December 6th, it will appear on the bill. According to the bill on December 7, the bill must be paid by December 25 at the latest. If the bill is paid one day early, the interest-free period will only be 20 days. \x0d\　 If you swipe your card on the billing date or a few days after, the interest-free period of the credit card will be the longest.