Except we don't act that way with the calendar. For some reason we have a BC (Before Christ)/AD (Anno Domini) split based on a miscalculation of His birth.
We take His birth as the event that divides history, from which our calendar is based.
If we really want the crucifixion and resurrection to be the dividing line in history, and convention takes these to be AD 33, then surely we should treat this as Year 1 (remember, there was no Year 0. 1 BC was followed by 1 AD - hence my amusement as the country went all gaga over the ending of the 99th year of the 20th century and the starting of the 100th year of the 20th century. The century and millennium began on 1 January 2001).
Hence, if we really take the crucifixion and resurrection as dividing history, surely we should start our calendar from then, and take 32 years off...
Have a great 1981