What did heavenly stems and earthly branches say?

Ten-day stems: A (ji ǐ), B (yǐ), C (bǐng), D (Dēng), E (w ǐ), F (jǐ? ), Geng, Xin, Ren, Gui.

Twelve earthly branches: Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei and Shen.

Ten families and twelve families are matched in turn to form sixty basic units, which cooperate with each other in a fixed order to form a subject of families and families. Judging from the Oracle Bone Inscriptions unearthed in Yin Ruins, heavenly stems and earthly branches was mainly used to record the date, month, year and time in ancient China.

Extended data:

Because the Gregorian calendar and the calendar year are completely different in system and cycle, the conversion between them is more complicated. Especially, it is very difficult to solve the daily budget of a public office. At present, it is mainly solved by querying the perpetual calendar.

After painstaking research, the author explored and derived a calendar formula for calculating the daily and terrestrial branches of the public, which is referred to as the "high daily branch formula" for short. The formula is simple, accurate, scientific and practical by inserting century constants and month cardinality, which completely solves the long-standing problem of calendar conversion. It has great practical significance on the specific issue of "if you don't check the calendar, the Rizhu will know early"