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The billing date means that the issuing bank will regularly summarize and settle all the transactions and expenses of your credit card account in the current period every month, calculate the total amount owed and the minimum repayment amount in the current period, and send a statement for you. This date is your credit card bill.
For credit card non-cash transactions, the interest-free repayment date is from the bank bookkeeping date to the due repayment date. The interest-free repayment period varies according to the regulations of each bank. The shortest is from the billing date to the final repayment date, and the longest is from the day after the billing date to the final repayment date of next month. If the billing date is 1 day and the final repayment date is 20 days, the shortest is 20 days and the longest is 50 days. During this period, as long as you pay off the current payable amount on the current statement, you don't have to pay any interest on non-cash transactions (you don't enjoy interest-free discount if you borrow cash in advance).
References:
Baidu encyclopedia-credit card