The year we are talking about now is the year of A.D. (also called A.D.), which makes no difference. In ancient China, the year of the monarch was used as the title, while the revolutionaries in the late Qing Dynasty used the year of the Yellow Emperor.

A.D. Chronology is also called A.D. Chronology for short. The chronology is a Christian chronology. The Latin word of the Middle Ages is Anno Domini, abbreviated as AD, which means "in the year of the Lord". In 525 AD, Dionysus, a Roman monk, thought that the year when Jesus was born was the first year of the era. Before BC, it means BC in English, that is, before Christ. The calendar adopted in AD is called Gregorian calendar. Usually called "Gregorian calendar, Gregorian calendar", it is the current calendar adopted by our government.

Huangdi Calendar is a calendar method created by Huangdi, the ancestor of Chinese culture, when he ascended the throne, according to the Chronicle of Huangdi, heavenly stems and earthly branches, and the Lineage of Emperors.