$query="
SELECT DATE_FORMAT(myDate, '%Y') as myYear,
DATE_FORMAT(myDate, '%m') as myMonth,
DATE_FORMAT(myDate, '%d') as myDay
FROM myTable
";
$result=mysql_query($query);
$row=mysql_fetch_array($result);
$myYear=$row['myYear'];
$myMonth=$row['myMonth'];
$myDay=$row['myDay'];
echo "
<input type=text name=myyear value=$myYear>
<input type=text name=myMonth value=$myMonth>
<input type=text name=myDay value=$myDay>
";