Date Selct Option PHP

<?Php

$todo=$_POST['todo'];

if(isset($todo) and $todo=="submit"){

$month=$_POST['month'];

$dt=$_POST['dt'];

$year=$_POST['year'];

$date_value="$month/$dt/$year";

echo "mm/dd/yyyy format :$date_value<br>";

$date_value="$year-$month-$dt";

echo "YYYY-mm-dd format :$date_value<br>";

}



?>

<form method=post name=f1 action=''><input type=hidden name=todo value=submit>

<table border="0" cellspacing="0" >

<tr><td  align=left  >   

<select name=month value=''>Select Month</option>
<option value='01'>January</option>
<option value='02'>February</option>
<option value='03'>March</option>
<option value='04'>April</option>
<option value='05'>May</option>
<option value='06'>June</option>
<option value='07'>July</option>
<option value='08'>August</option>
<option value='09'>September</option>
<option value='10'>October</option>
<option value='11'>November</option>
<option value='12'>December</option>
</select>



</td><td  align=left  >   

Date<select name=dt >

<option value='01'>01</option>
<option value='02'>02</option>
<option value='03'>03</option>
<option value='04'>04</option>
<option value='05'>05</option>
<option value='06'>06</option>
<option value='07'>07</option>
<option value='08'>08</option>
<option value='09'>09</option>
<option value='10'>10</option>
<option value='11'>11</option>
<option value='12'>12</option>
<option value='13'>13</option>
<option value='14'>14</option>
<option value='15'>15</option>
<option value='16'>16</option>
<option value='17'>17</option>
<option value='18'>18</option>
<option value='19'>19</option>
<option value='20'>20</option>
<option value='21'>21</option>
<option value='22'>22</option>
<option value='23'>23</option>
<option value='24'>24</option>
<option value='25'>25</option>
<option value='26'>26</option>
<option value='27'>27</option>
<option value='28'>28</option>
<option value='29'>29</option>
<option value='30'>30</option>
<option value='31'>31</option>
</select>


</td><td  align=left  >   
Year(yyyy)<input type=text name=year size=4 value=2005>
<input type=submit value=Submit>
</table>
</form>
Nice Narwhal