The billing date of a credit card has nothing to do with the activation time of the card. If your card is not activated (that is, it is not opened), no bill will be generated.
At present, the date of credit card bills of major banks in China is complicated, and it is not clear in one or two sentences. For details, please refer to the following Baidu experience:
20 14 "Punch" credit card bill date and repayment date of each bank.
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