When does the season change?

The alternation dates of four seasons are related to 24 solar terms, such as beginning of spring, Changxia, beginning of autumn and beginning of winter.

Beginning of spring this day as the beginning of spring. Long summer refers to the beginning of summer. This day in early autumn is the beginning of cool autumn. This day in beginning of winter means the beginning of winter. The date of seasonal change has nothing to do with March 2 1 day and June 22 of the lunar calendar.