Anno Domini System?

Answer

Anno Domini (AD or A.D.) is a designation used to label years in the Julian and Gregorian calendars. The term is used to refer to years after the birth of Christ, e.g. 500 AD would mean 500 years after the birth of Jesus.
2 Additional Answers
Anno Domini is a Latin word which means “the year of our Lord”. It is abbreviated as A.D, which means the number of years since the time of Jesus. It is used in the Gregorian calendar to refer to the current era, for example, a date such as 1945 A.D. literally means the 1945th year of our lord.
Anno Domini abbreviated as AD is a Christian calendar based on the traditionally reckoned year of the birth of Jesus Christ. It is used to number years in Julian and Gregorian calendars.
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