April to the second quarter of June

July to the third quarter of September

10-65438+February 4th quarter

The quarterly classification of primary school mathematics is based on the Gregorian calendar, which is mainly used for daily work (except agriculture), such as financial accounting. However, in China, the traditional so-called four seasons refer to seasons, which are divided according to the lunar calendar, and beginning of spring, Changchun, beginning of autumn and beginning of winter shall prevail. The lunar calendar will be considered in agriculture and teaching arrangements.