How do dates work with BC and AD?
In the modern calendar, we label all years with B.C. (before Christ) or A.D. (anno domini, or in the year of our lord). There is no zero year -- in this system, the year Christ was born is 1 A.D., and the year preceding it is 1 B.C. (for before common era) and C.E. (for common era).
What order do BC dates go in?
The period before that is known as B.C. (short for Before Christ) and the years after are known as A.D (short Anno Domini, and meaning the Year of our Lord). What can make this system confusing is that events in the B.C. era are dated in descending order, whilst those in the A.D. era happen in ascending order.
How do you add BC and AD years?
For example, if you need to work out how many years are between January 1, 200 B.C. to January 1, A.D. 700 you add the BC and AD numbers. The calculation is 700 + 200, which equals 900 years. However, you still have to adjust for the absence of year 0. You do this by removing 1 from your answer, so 900 minus 1 is 899.
How do you write AD after a date?
Position. BC, BCE, and CE come after the year. Write or say 300 BC or 300 before Christ, 300 BCE or 300 before common era, and 2015 CE or 2015 common era. However, AD comes before the year, so write or say AD 2015 or anno Domini 2015.