I have always thought that God works by the Hebrew calendar, and that the Hebrew years are off. The geneologies in the New Testament don't match up with the old at Arphaxad. Do the proper math, and you have almost two hundred years missing. If the Current year is 5765, that would make it 59?? instead. If you consider that in the Psalms and in 1 Pe or 1 Jn it states that a day is a thousand years, we would be right at the end of the sixth day, and ready for the sabbath.
I think the calendar might be off in another way, too, but I don't know how.