When filling in the starting and ending time of academic experience, it should generally start in the month of the year of admission and end in the month of graduation. Specifically:

1. Admission time: If you forget the specific admission date, you can generally default to September of that year.

2. Graduation time: The graduation time is subject to the date written on the graduation certificate.

3. Filling format: In the registration system or resume, the starting and ending time is generally only filled in the month, and it is not necessary to be specific to a certain day.

4. Fill in the major: the name of the major to be filled in the graduation certificate. For primary schools and high schools, you can fill in "primary school" or "high school" directly without choosing a professional category. If you need more specific start and end times, you can refer to the information on Xuexin.com to ensure the accuracy of the information. On the resume, you can give an approximate starting and ending time of educational experience, such as "September 18, July 1 graduation, 202 1".