When is May Day every month?

The May Day of each month is the six days of Wuzi, Wuyin, Chen Wu, Wuwu, Wushen and Wuxu, which is a term of Taoism, the most important among many stresses of Taoism, and also a taboo of Xiandao. It is commonly called Pentecost or every Pentecost.

Mayday is pushed from the old almanac in the order of sixty jiazi, and every sixty days is a round. All the year round, we don't farm for 38 days.