What season is dog days? When is the specific date in the dog days?

The dog days are summer. The date of stay is not fixed every year, so it is not fixed in dog days, usually from mid-July to mid-August, which may be 30 days or 40 days.

The ancients in China used the method of "chronology of cadres and branches" to calculate the year, month, day and time. The so-called "trunk branches" are ten "heavenly stems" and "twelve earthly branches". Use the combination of heavenly stems and earthly branches to represent the serial number of year, month and day. Because there are 10 days, there is a Geng day every 10 days.

According to the traditional calculation method, the third Geng day from summer to the future in the 24 solar terms is called "initial lodging", the fourth Geng day from summer to the future is called "intermediate lodging", and the first Geng day after the neutral autumn in the 24 solar terms is called "final lodging". However, because the number of days between the summer solstice and the first Geng day is almost different every year, the number of days between the summer solstice and the third Geng day is not fixed.