Wait hang on is that calender system Gregorian though? I think going from 1 BC to 1 AD is Julian.
EDIT: Aha, I think you're right.
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From Wikipedia:
"Year zero" does not exist in the widely used Gregorian calendar or in its predecessor, the Julian calendar. Under those systems, the year 1 BC is followed by AD 1. However, there is a year zero in astronomical year numbering (where it coincides with the Julian year 1 BC) and in ISO 8601:2004 (where it coincides with the Gregorian year 1 BC) as well as in all Buddhist and Hindu calendars.
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