1. If the annual stem is Party A or Party B, the stem of the first month of that year is Party C; If the annual stem is B or G, the stem of the first month of that year is Wuyin; If the annual stem is C or Xin, the stem of the first month of that year is Geng Yin; If the annual stem is Ding or Ren, the stem of the first month of that year is Ren Yin; If the annual stem is E or decyl, the stem of the first month of that year is Jiayin.
2. The abbreviation of birthdates is eight characters, which refers to the date of the calendar when a person was born; Year, month, day, * * * Four pillars, two words for each pillar, and eight words for * * *. Birthdates occupies an important position in China's folk beliefs, and ancient China Taoists and astrologers calculated people's fate accordingly.