A century is a hundred years, which usually means a hundred years in a row.

This odd chronology comes from after Jesus' time. The first century should be from 1 to 100, and the twentieth century will be from 190 1 to 2000. So 2000 is not the first year of 2 1, but 200 1.

Year, an era is ten years, which means ten years in a row, and it is usually suitable to use AD year.

That is, every century is a period of ten years, the first decade is the first decade, and the first year is the first year.

For example, at the beginning of a century: from 1 to19; 1920s: 20-29 AD; 1960s: 60-69 years old; 90' s: 90 to 99.

Extended data

The Gregorian calendar era, referred to as "A.D.", is an internationally accepted chronological system. The legendary birth year of Jesus Christ is the first year of Gregorian calendar (equivalent to the first year of Emperor Ping of the Western Han Dynasty in China).

The "Gregorian calendar era" came into being in the sixth century when Christianity prevailed. At that time, monks attached everything to Christianity in order to expand the ruling power of the church.

In 525 AD, a monk named De Onisi put forward the view that Jesus was born 284 years before Diocletian in ancient Rome in order to predict the Easter date seven years later (that is, in 532 AD), and advocated taking the year of Jesus' birth as the starting point, which was strongly supported by the church.

In 532 AD, the church took 284 BC as the first year of AD and used this chronology in the church. By 1582, the Pope had formulated the Gregorian calendar and continued to adopt this chronology. Gregorian calendar is called Gregorian calendar because of its high accuracy and international use. From then on, the year of Jesus' birth invented by priests was called the first year of AD.

This chronological system began to be adopted by European countries. The year after the outbreak of the Revolution of 1911 (19 12), the then government of the Republic of China adopted the Gregorian calendar as its national calendar. In chronology, the chronology of the AD is parallel to that of the Republic of China.

The calendar year of People's Republic of China (PRC) (China) adopts the AD calendar year system of most countries in the world, which was decided by the first plenary session of China People's Political Consultative Conference on 1949. At the meeting, everyone agreed to adopt the common calendar system in most countries in the modern world, that is, adopt AD as the calendar year of new China. On September 27th, the second of the four resolutions adopted at the first plenary session of the China People's Political Consultative Conference was: "The year number of People's Republic of China (PRC) adopts AD".

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