According to what time period are the summer and autumn schedules and winter and spring schedules of airlines divided each year?

It is divided into summer and autumn timetable and winter and spring timetable. The summer and autumn timetable is also called the peak season timetable, and the implementation time starts from the last Sunday in March to the last Saturday in June 10. The winter-spring timetable is also called the off-season timetable, and the implementation time starts from the last Sunday of June each year 10 to the last Saturday of March the following year.