What you want to ask is the knowledge in the field of number and algebra, which belongs to the third volume of primary school mathematics in Jiangsu Education Press.

The year, month and day are the contents from page 17 to page 18 in the second volume of mathematics in the third grade of primary school, which belong to the knowledge in the field of number and algebra in the new mathematics curriculum standard.

After the previous study, the students have learned about clocks and learned the 24-hour timing method. This class will further study the time unit year, month and day, and learn this part of knowledge well to lay a solid foundation for the next class to study the flat year and leap year.