Usually from the day you borrow money. Suppose your installment application is approved as scheduled on 2018.18, and the principal and interest will be repaid on 20 18.2.8 next month. The interest rate of each platform is different, and the calculation method is different. Some are equal principal and interest, some are average capital, and some are equal interest. Or, as scheduled, for example, the interest rate is equal interest, that is, the amount to be repaid every month is the same.