Got the same sort of bollix from a teacher when I was about nine. She'd been talking about the birth of Jesus being the dividing line between BC and AD, therefore by the unbroken count from His birth it was now 1969 or 1970 or 1971 or whatever it was, and how long a time it is by our standards.. Now, I'd been independently reading - I guess this is the sort of thing teachers dread - and I started asking about, well, are we sure? Because the Ancient Romans didn't count years as we do, Miss, they used the number of years an Emperor had been reigning, and there are people who think we got the count wrong when we switched over, so that Jesus was actually born in what we'd call 4 BC, so isn't this year really 1965 if we correct the mistake?
so all the other kids sniggered, who is this idiot who believes Jesus was born in 4 BC, Teacher gets angry but can't easily correct me, I think she fell back on "Because the Bible tells us so", and I said "What if the Bible's wrong?" - dead silence, shocked gasps, me in trouble. Took a while to think it through, but I never trusted a teacher to get it right again, after that.
Oh, and much later, discovered the census that gets mentioned in the Gospels which my teacher was using to time Jesus' birth to 0 BC... is most likely to have happened sometime around 6BC. therefore.... it's really 2015, guys. 2020 is yet to happen...