1. Confirm whether the filling format is correct. When you fill in the date of birth, you usually need to use the correct separator in the order of year, month and day, such as "/"or "-".
2. Check whether there is a problem with the system. If the form is correct but cannot be filled in, there may be a problem with the system. You can try to log in again, or contact the relevant departments for consultation.
Ask for help. If the above methods can't solve the problem, you can consider consulting the academic affairs office or information center of the school, and they will provide corresponding solutions.
In short, if you encounter the problem of not filling in the date of birth, you need to stay calm and try different solutions.