According to the laws of our country, the academic year (which can be primary school, junior high school, senior high school, university and postgraduate) is one year, generally from September in autumn to September of the following year (including winter and summer vacations).
Academic year algorithm:
Different learning units have different algorithms, which basically refer to two semesters a year. Most of them are more formal schools, but private and amateur schools are not necessarily. Some are a whole year, others are a year, no matter how long. If you don't study a few days a year, it will be a school year.
Baidu encyclopedia-one academic year