What day of the month?

In a year 12 months: the first two months of spring, the second day, the last month, the fifth day and the first day; The third and fourth days of the first two months of summer, the fifth and first day of the last month; The first two months of autumn are Geng Day and Xin Day, and the last month is May Day and Ji Day. The first two months of winter are non-union day and declination day, and the last month is May Day and self Day. In the old calendar, one day is the first day of every ten days. The peak note of "Three Days before Jiazi" in Yigu: "The first day of every ten days is Jiayue." The second day is to record the days with dry branches, and then take 60 days as a cycle, and there are six B days: B Ugly Day, B Hai Day, B You Day, B Wei Day, B Si Day and B Mao Day. May days are pushed from the old calendar in the order of 60 jiazi, and every 60 days is a round, including every Wuzi, Wuyin, Chen Wu, Wuwu, Wushen and Wuxu.