Ah. Made me feel pretty dumb. As soon as I changed it to Date::Calc I stopped getting the error. However, when I rechecked CPAN (http://search.cpan.org/~morty/DateConvert-0.16/Convert.pm) I realized the code I copied from the synopsis was incorrect:

  use Date::DateCalc;

        $date=new Date::Convert::Gregorian(1997, 11, 27);
        @date=$date->date;
        convert Date::Convert::Hebrew $date;
        print $date->date_string, "\n";
[download]