my @mdays = (31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
my ($month, $year) = ((localtime)[4]+1, (localtime)[5]+1900);
my $mdays = ($year-2000)/4 == int(($year-2000)/4) && $month == 2 ? 29 : $mdays[$month-1];
print $month, \'/\', $year, \' -> \', $mdays, \' days\';