For Believers of 1/1/2000 Starting the 21st Century

From Wikipedia: "Anno Domini (abbreviated as AD or A.D., sometimes found in the irregular form Anno Domine) and Before Christ (abbreviated as BC or B.C.) are designations used to number years in the Julian and Gregorian calendars. The calendar era to which they refer is based on the traditionally reckoned year of the conception or birth of Jesus, with AD denoting years after the start of this epoch, and BC denoting years before the start of this epoch. There is no year zero in this scheme, so the year AD 1 immediately follows the year 1 BC."

Hey, what starts with one, ends with 100 for a full century. 101 is first year of next century. Are you listening? Can you follow this through the END of the 20th century, which happened on 12/31/2000? Still batting my head against a masonry partition?