[RESOLVED] Calculate the Age

How can i get my exact age? i make a code but it doesn't work. i want to happen is calculate the age. date now - date of birth then will show my age.

Code:

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<?php
$day = $_POST['day'];          //using select or drop down list
$month = $_POST['month'];  //using select or drop down list
$year = $_POST['year'];      //using select or drop down list
$age = date(("m-d-Y") - ($month.$day.$year));

echo "<h1>Your age now is $age </h1>";
?>

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first, use mktime() to create a Unix timestamp.

PHP Code:

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$birthdate = mktime(0, 0, 0, (int) $_POST['month'], (int) $_POST['day'], (int) $_POST['year']); 


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then, subtract the years. if you're only interested in the year:

PHP Code:

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echo "you are " . (date('Y') - date('Y', $birthdate)) . " years old."; 


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alternatively, if you are not storing the $birthdate variable in a database or something, you could make it even more simple:

PHP Code:

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echo " you are " . (date('Y') - (int) $_POST['year']) . " years old."; 


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thanks it works... but how could i use the day and month? let say my birthday is august 25 1988 and my current age is 21. when august 25 past my age will be 22? how could i code it?

the first solution in my post that makes use of mktime() will take the day and month of the year into account. the second method only deals with the year.