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No one changed it. It was an arbitrary guess for the date of birth of christ which turned out to be wrong when matched against other evidence

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Q: Who changed the year from BC to AD?
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How to calculate years using bc from ac?

Take the BC year and add it to the AD year with present year and bc & ad


Is 2001 a BC year or an AD year?

Both. It was the last year of the 21st century BC, and the first year of the 21st century AD.


Did AD come before or after BC?

AD followed BC. BC stood for Before Christ, and AD after him (Anno Domini, "year of our lord").Note that this means 1 BC was immediately followed by 1 AD, with no "zero year" between them.


What do ad and bc mean related to time?

BC = before christ AD = Anno Domini (year of our Lord) we are in the year 2011, time before year 1 was BC time afterwards (what we live in) is AD


Why is the year Jesus Christ was born and important event on a historical time line?

When it comes to his birth nothing changed on the time line. He was born 33 BC. However his death was when the calendar changed from BC to AD.


What happened in the time period between AD and BC?

Nothing. There was no time period between BC and AD. 1 BC was followed by 1 AD. There was no year zero or any gap between BC and AD.


Does AD go before or after the year?

AD is after and BC before


What is mean AD AND BC?

BC = Before Christ. AD = Anno Domini (latin) the year of Christ's birth.


How many years are there between 30 BC and 30 AD and why?

58 years are between 30 BC and AD 30. The first thing you need to remember is that there is no year 0; the year before AD 1 is 1 BC. So the years between 30 BC and AD 30 are... 29 BC, 28 BC, 27 BC, ..., 2 BC, 1 BC, AD1, AD 2, ..., AD 27, AD 28, AD 29 29 BC through 1 BC is 29 years, and AD 1 through AD 29 is 29 years. 29 years + 29 years = 58 years


BC and AD w what do these dates mean?

bc= before christ ad= anno domini ( the year of our lord)


What is mean by before Christ and what is the last year for before Christ?

If you're talking about BC and AD, BC has always been refered to as Before Christ. AD has always been refered to as After Death. Both these statements are wrong. Christ Jesus was born around 4 BC and died around 37 AD. AD actually stands for the Latin phrase Anno Domini meaning "in the year of our Lord". I hope this answers your question.Ignoring the question of exactly when Christ was born, the last year BC was 1 BC and the first year AD was AD 1. There is no zero year in either system. The years just go ... 5 BC, 4 BC, 3 BC, 2 BC, 1 BC, AD 1, AD 2, AD 3, AD 4, AD 5 ...Each century AD starts on a 01 year (e.g. 1901) and ends on a 00 year (e.g. 2000), the given example was the beginning and ending of the 20th century. Each century BC starts on a 00 year and ends on a 01 year, as the years count backward.


What was the year before 100 BC?

100 BC is a year. Right now it is 2010 AD.