For example, if your bill date is 12, your credit card payment date is 1 1, and the interest-free repayment period stipulated by your issuing bank is within 20 days after the bill date, then your repayment is only 20 days.
If your credit card consumption date is 13, then this consumption will enter the next bill, and your bill will not be generated until next month 12, so you have an interest-free repayment period of 50 days, that is, 30 days from the credit card consumption date to next month 12, plus 20 days after the bill is generated.