[PHP] Outputting a 2 digit number < 10

[Jamie]

I need to enable a user to insert an 'NEWS' item into a mySQL table one of
the definable limits for the user is to be the date that the news is to be
displayed. Currently the collum is in a 'date' format and should be stored
in a YYYYMMDD - being Australian we are used to the exact reverse of that so
I though it best to produce a series of three select options in html and
then joing the values before inserting them

 $form_date = $form_date_Year . $form_date_month . $form_date_day;

CRUX: the looping format I'm using to make the options needs to output a 2
digit number as a single digit like 1 as compared to 01 will invalidate the
date

Sample of a loop I use to output an option

<? echo"<select name=\"form_date_day\">";
              $day = (date ("d"));
              $daysinmonth = (date("t"));
        for ($i=00;$i<$daysinmonth;$i++){
          if ($i == $day) {
           echo("<option SELECTED value=\"$i\">$i</option>\n");
          } else {
            echo("<option value=\"$i\">$i</option>\n");
           }
         }
         echo"</select>"
  ?>

Any help will be apreciated
Jamie