How to calculate age in PHP

Posted on August 29, 2008, Filled under PHP,  Bookmark it

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Here’s a simple php function that calculates the age of someone, in years.

<?php
/*
Credits: http://www.bitrepository.com
URL: http://www.bitrepository.com/web-programming/php/simple-age-calculator.html
*/
function determine_age($birth_date)
{
$birth_date_time = strtotime($birth_date);
$to_date = date('m/d/Y', $birth_date_time);

list($birth_month, $birth_day, $birth_year) = explode('/', $to_date);

$now = time();

$current_year = date("Y");

$this_year_birth_date = $birth_month.'/'.$birth_day.'/'.$current_year;
$this_year_birth_date_timestamp = strtotime($this_year_birth_date);

$years_old = $current_year - $birth_year;

if($now < $this_year_birth_date_timestamp)
{
/* his/her birthday hasn't yet arrived this year */
$years_old = $years_old - 1;
}

return $years_old;
}

// You can write about any English textual datetime description

$birth_date = '1 May 1980';

$age = determine_age($birth_date);

echo $age;
?>

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2 Replies to "How to calculate age in PHP"

  1. Thanks for the code!!

  2. HI
    this code is not working for AGE before
    1970 year
    it is working only for the YEAR after 1970
    please check 1 ce

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