# Keyword Analysis & Research: definition of ad timeline

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How to calculate years across BC and ad?

a) If calculating years from AD to a BC date, subtract a year: Example: 29 AD – 30 = -1 -1 or 2 BC b) If calculating years from a BC to AD date, add a year: Example: -2 BC + 30 = 28 + 1 or 29 AD c) If calculating total years between AD and BC dates, subtract a year. Example: 29 AD - (-2 BC) = 31 Years -1 = 30 years total between

Why did we go from BC to AD?

Why did years change from BC to AD? The Anno Domini dating system was devised in 525 by Dionysius Exiguus to enumerate the years in his Easter table. His system was to replace the Diocletian era that had been used in an old Easter table because he did not wish to continue the memory of a tyrant who persecuted Christians.

What comes before AD or BC?

To cater to religious diversity, the abbreviations BCE (Before Common Era) and CE (Common Era) can be used to replace BC and AD. Of note, AD is written before the year, while BC, BCE, and CE are all written after the year. For example: The abbreviation AD (Anno Domini) means "in the year of the Lord" and denotes "of the Christian Era."