Rick,

  In case noone else has answered your question, there is only one year
between 1 BC and 1 AD.  The "Christian Era" began on Ja. 1st, 1 AD.  Thus,
Jan. 1st 2000 will be 1999 years into that era, rather that 2000 years into
that era and the second millenium will not be until the turn of the year
2001.
Kevin McCartney, Ph.D.
Associate Prof., Geology
Director, Northern Maine Museum of Science
University of Maine at Presque Isle
Presque Isle, ME  04769