Why did China also use AD to record the years in ancient times? At that time, the method of AD chronology spread to China.

(1) After the Revolution of 1911, the result of learning from the West and connecting with the West. From the year after the Revolution of 1911 (19 12), China adopted the Gregorian calendar month and day, but at the same time adopted the year of the Republic of China.

② The chronology of People's Republic of China (PRC) adopts the AD chronology of most countries in the world, which was decided by the first plenary session of China People's Political Consultative Conference on September 1949.

In the first year of A.D.-the first year of Emperor Liu kan of Han Ping (KAN), the Year of the Rooster was intentional. This is a backward derivation of the chronology of the Yellow Emperor and AD, that is, 19 1 1 year is the Xinhai year and Xuantong year of the Qing Dynasty, and it is backward derivation of the first year of AD.