Days in months of year

Are you lazy to count how many there are days in months of certain year?

I have created small php counter for my self.

Its pretty useful so i want to share it.

http://www.drunksick.com/index.php?p=daysinmonth

Main part of code:

for($year_s;$year_s<$year_f;$year_s++)

{

  for($month=1;$month<=12;$month++)

  {

    echo $month."'th month of ".$year_s." has: ".cal_days_in_month(CAL_GREGORIAN, $month, $year_s)." days
";

  }

}