How many years have gone by from 200 B. c to 100 B. c

200 BC(Before Christ) or BCE (Before Common Era) is 200 years plus the AD 2018 (Anno Domini… Year of Our Lord after the birth of Christ) or CE (Common Era) years after the birth of Christ, which would equal 2218 years from today. I stand corrected (Thanks for the comments! ). Approximately 2200 years ago, as BC uses the birth of Jesus (Christ) of Nazareth's birthday. AD stands for Anno Domini, or Year. So if 100BC is 2114 years ago
A common source of confusion when calculating date distances between BC and AD (or BCE and CE) is that there was no year 0 . AD 1 was immidiately preceded by 1 BC. Hence, Caesar's birth in 100 BC was 2114 years ago rather than 2115 years ago (as of 2015. 200BC must be 2218 years ago approximately 2200 years ago.