How to calculate the social security interest for seven years in Shenzhen?

The calculation method of paying social security interest for seven years in Shenzhen is monthly social insurance premium payable × days in arrears × five ten thousandths = late payment fee (rounded to two decimal places). Calculation method of overdue fine days: overdue fine calculation end date-overdue fine calculation start date. Late payment fee calculation start date: calculated from 1 day of the second month of the settlement date; Late payment fee calculation deadline: take the day before the generation date of the generated customs declaration.