The dog days in 2022 will last for 40 days, starting from July 16 and ending on August 24.

The algorithm of the dog days is from the third Geng day after the summer solstice, which lasts for ten days. Zhongfu starts from the summer solstice to the fourth Geng Day, and ends the day before the first Geng Day after the solar terms in beginning of autumn. The last stage was the beginning of the first Geng Day after beginning of autumn, and it took ten days. Because the number of days in midsummer is uncertain, some years are 10 days, while others are 20 days, so the number of days in dog days is different, 30 days or 40 days.

One volt (initial volt): July 2022 16-July 25, 2022, *** 10 day. Two volts (middle volts): July 26th, 2022-August, 202214th, ***20 days. Trivolt (terminal volt): August 2022 15-August 24, 2022, *** 10 day.