I followed the logic and correctly misread this. That is, I understood that 2000.12.27 was meant, and not 1999.12.27. You can count that way if you like, but this is not the way odometers work. The units digit of an odometer reads 9 during the time that the odometer is advancing between 1999.0000 and 1999.9999 . It's the sort of twisted argument that an ostentatiously intelligent fool like vos Savant would make.
People have some more firmly-held opinions about the present than about the distant past.
Wendy Warren insists that a multiple carry of the shift register is cool and a good excuse to celebrate. It is accepted fact that the register currently reads 1999 and will turn over in less than four months. To insist that thinking in terms of an odometer metaphor requires one to set the odometer to zero at the start of the commmon era and and therefore relabel every year since is perverse and unconvincing. I say party hearty. And again on March 25.