use Time::Local;

$date = '30Nov00';

my @months = qw/Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec/;
my $i = 0;
my %months = map { $_ => $i++ } @months;

my @dmy = $date =~ /(\d+)([A-Z]+)(\d+)/i;
$dmy[1] = $months{$dmy[1]};
if ($dmy[2] < 60) {                     # have to handle two-digit
  $dmy[2] += 100;                       # year somehow
}

my $time = timelocal(0, 0, 12, @dmy);   # noon, to avoid DST issues
$time += 60 * 60 * 24;                  # advance one day

my @dmy = (localtime($time))[3, 4, 5];
$dmy[1] = $months[$dmy[1]];
$dmy[2] %= 100;

my $date2 = sprintf "%02d%s%02d", @dmy;

print "$date2\n";