PHP Example
Screen shot
Dynamically Print Date Of Birth

<?php

if(isset($_POST[\'btn\']))

{

$year  = (date(\"Y\")-1) - $_POST[\'year\'];

$month = date(\"m\") - $_POST[\'month\'];

$day   = date(\"d\") - $_POST[\'day\'];

echo \"your date of birth is \".$_POST[\'day\'].\"-\".$_POST[\'month\'].\"-\".$_POST[\'year\'].\"<br>\";

echo \"your age is $month month $year\";

}

?>

<html>

<head>

<title>PHP Example</title>

</head>

<body>

<form action=\"\" method=\"post\">

<?php

echo \"select Your date of birth\";

$month_array=array(\"January\",\"February\",\"March\",\"April\",\"May\",\"June\",

\"July\",\"August\",\"September\",\"October\",\"November\",\"December\");

 

echo \"<select name=\\\"day\\\">\";

$i = 1;

while ( $i <= 31 ) {

   echo \"<option value=\".$i.\">\".$i.\"</option>\";

   $i++;

}

echo \"</select>\";

echo \"<select name=\\\"month\\\">\";

$i = 0;

while ( $i <= 11 ) {

   echo \"<option value=\".$month_array[$i].\">\".$month_array[$i].\"</option>\";  

   $i++;

}

echo \"</select>\";

echo \"<select name=\\\"year\\\">\";

$i = 1900;

while ( $i <= 2007 ) {  

   echo \"<option value=\".$i.\">\".$i.\"</option>\";  

   $i++;

}

echo \"</select>\";

?>

</form>

</body>

</html>

<?php
if(isset($_POST[\'btn\'])){
   $year  = (date(\"Y\")-1) - $_POST[\'year\'];
   $month = date(\"m\") - $_POST[\'month\'];
   $day   = date(\"d\") - $_POST[\'day\'];
echo \"your date of birth is \".$_POST[\'day\'].\"-\".$_POST[\'month\'].\"-\".$_POST[\'year\'].\"<br>\";
echo \"your age is $month month $year\";
}
?>
<html>
<head>
<title>PHP Example</title>
</head>
<body>
<form action=\"\" method=\"post\">
<?php
echo \"select Your date of birth\";
$month_array=array(\"January\",\"February\",\"March\",\"April\",\"May\",\"June\",
\"July\",\"August\",\"September\",\"October\",\"November\",\"December\");
echo \"<select name=\\\"day\\\">\";
$i = 1;
while ( $i <= 31 ){
   echo \"<option value=\".$i.\">\".$i.\"</option>\";
   $i++;
}
echo \"</select>\";
echo \"<select name=\\\"month\\\">\";
$i = 0;
while ( $i <= 11 ) {
   echo \"<option value=\".$month_array[$i].\">\".$month_array[$i].\"</option>\";  
   $i++;
}
echo \"</select>\";
echo \"<select name=\\\"year\\\">\";
$i = 1900;
while ( $i <= 2007 ) {  
   echo \"<option value=\".$i.\">\".$i.\"</option>\";  
  $i++;
}
echo \"</select>\";
?>
</form>
</body>
</html>

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You can download source code here