Climb off the high horse, will ya...God layed out the timetable in Genesis and confirmed it all thru out the bible...The Jews are God's chosen, special people...god will deal with them differently than he deals with Christians and non Jewish people...But for the Christians, the time is Nigh...
Which brings me to one of my hobby horses:
We already agree that our calendar is wrong, off by anywhere from 2 to 16 years, depending on who's doing the reckoning, and further in error because of the absence of a year zero.
The more fundamental point is that God did not intend us to mark His years by the birth of Jesus.
If He had intended this we would have a Biblical fixing of the date.
Further, the day of Jesus' birth is unremarkable as all men are born.
However, very few return from the dead, that event is remarkable, and it is the defining moment of Christianity, the very moment of proof that his sacrifice was not in vain. And the Bible gives a precise reference for when this happened!
Clearly this was the date the calender was supposed to start!
For extra points, this makes our calender off by anywhere from 17 to 30 years. That makes this something like Holy Year 1988 to Holy Year 1975, giving us anywhere from 12 to 25 years to get our affairs in order before the real end of the millennium...