When did the Gregorian calendar first originate?

The Gregorian calendar originated in 835 AD.

With the maturity of engraving printing technology in Tang Dynasty, the government began to print calendar days. According to historical records, in 835 AD, there was an old calendar book engraved with wooden boards.

On the basis of these engraved calendars, a lot of things about bank taboos began to appear. However, due to the cost factor, this rich evasive content does not appear in the resume of the banknote seller. Because the almanac is a tool for the emperor to promulgate the calendar, people also call it the "imperial calendar".

Extended data:

In modern times, the main contents of the Gregorian calendar include: Gregorian calendar, lunar calendar and trunk calendar, which should be avoided with good or ill luck, washing away, good luck and evil, combined injury, pleasing to the ear, trunk and branch, twenty-four solar terms and twelve gods.

Duty, Fetal God, Peng Zu Baekje, Liu Yao, nine planets, fleeting time, Tai Sui, Sanyuan Jiuyun, nine planets in Kong Xuan, the god of wealth XiShen, the week, the zodiac, the azimuth and so on. In other words, people in ancient China recorded their daily likes and dislikes on calendars as a guide to action.