I don't know why you've let yourselves be dragged into this morass by a serial plonker. He's talking about the old chestnut that Matthew couldn't count: from Babylon to Jesus is 13, not 14, generations. It only matters a spit if you think the Bible is inerrant. Most people, and all people who are intellectually open, don't.

Since that Biblical statement isn't true, it's not surprising that Jesus was wrong (or wrongly reported) when he claimed that the Kingdom of Whatever would be in the lifetime of some of those listening. After all, he was a man, and men are fallible.

But it is relevant to the other discussion about BC/AD: the computation of Dionysius Exiguus can be taken as symbolic of the fact that Christians had finally given up on the Second Coming. Prior to then, there was no need for a calendar, as soon there would be nothing to date.

But to return: if Jesus was telling the truth, where are the bimillenarians?