Investors who make fixed investment can choose the deduction date, deduction frequency and fixed investment amount according to their own situation. Deduction can be made once a month, or once a quarter or half a month. Although the fixed investment is deducted on a fixed day every month, because some months only have 28 days, in order to prevent 27.28 days from falling on Saturday and Sunday, the deduction can only be made at a fixed time throughout the year, and the deduction date can only be 1-26 days per month. In addition, in case of holidays, the date of deduction will be automatically postponed. For example, the agreed deduction date is 8th of each month, but if 8th of each month falls on a Sunday, the deduction date will be automatically postponed to 9th. Therefore, the first deduction time is not necessarily the first trading day.