How to divide early autumn and late autumn?

The way to distinguish beginning of autumn:

If it is the first half of beginning of autumn, that is, beginning of autumn before 12 noon, then it is "early autumn"; If the second half of the day is beginning of autumn, that is, beginning of autumn after noon 12, then it is "late beginning of autumn".

One way of saying this is to distinguish between a single day and a double day according to the lunar calendar. If this day in early autumn is a day (one, three, five? ), so it is called "early autumn"; If it is a double day (Tuesday, Thursday and Saturday? ), it is called "late autumn". The seventh day of August is the tenth day of the seventh month of the lunar calendar, which is a double day. Therefore, beginning of autumn in 2022 belongs to "late beginning of autumn".