The class of 2022 refers to the students who graduated in 2022. The time for college students to enter the autumn semester is generally in the middle and early September, and the primary school students are in September 1 day. Primary and secondary school students, that is, primary school, junior high school and senior high school, have the same start date in autumn, except for senior three.

A semester refers to a class unit in a school year. Different countries have different semester systems. The common semester system includes two semesters, three semesters and four semesters. Spring or autumn of the school year. In China, the two-semester system is the majority.

Schools at all levels in Chinese mainland (including all primary and secondary schools, high schools and most universities) implement a two-semester system, with the first semester from September to the following year 1 month and the second semester from February (according to the date of the Lunar New Year) to June.