A problem is that the reference to BC and AD are built on the false history that the Messiah was born in year 1. It can be conclusively established that He was born no later than 4 BC(E).
And, isn’t EVERY year His year anyway (i.e. AD)?
Anyone who deals with Greek history has to deal with backwards counting. It would have been easier if Jerome or someone had selected some earlier date like the birth of Abraham or the Flood and counted forward from that. Plus if you want to calculate the interval since a date B.C. you have to remember there was no year zero--so the 2500th anniversary of the battle of Marathon was 2011, not 2010.
People who don't like "B.C." because it means "Before Christ" could just read it as "Backwards Counting." Then "A.D." becomes "After Dat."