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

The dog days are summer. The date of stay every year is not fixed, so the dog days are not fixed, 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 years, months, days and hours. The so-called "dry branches" are ten "heavenly stems" and "twelve earthly branches". Use heavenly stems and earthly branches combination 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 "Summer" and the first Geng Day is almost different every year, the number of days between "Summer" and "Three Nights" is not fixed.