a) Use the full date-century to enter your AD, ie 1999-06-12, 2001-44-02 etc, or...
b) A good work-around for those users preferring to use two-digit entries is to prefix the year 2000 items and onwards with the tilda symbol, ie. "~". Thus your entries would look:
99-06-12, ~01-44-02 etc.
The presence of the prefix tilda symbol forces the "01" item to follow the "99" item