Question

I’m building a registration system with PHP and need to create a function that takes a date of birth (as a timestamp) and returns the age on (April 31). What I have now is:

<?php
function get_adj_age($dob)
{
    $age = (time()-$dob);
    $today = strtotime(date('F d', time()));
    $diff = ($cutoff - $today);
    $adj_age = floor(($age+$diff)/31556926);

    return $adj_age;
}

For some reason this is breaking my brain. Anyone mind checking me on this? Cheers.

Answer 1

function adjustedAge($dob, $adjustTo = 'April 31') { // DOB can be of any format accepted by strtotime()
    return ((new DateTime($adjustTo.', '.date('Y')))->diff(new DateTime($dob)))->y;
}

Essentially what this does it create a DateTime object for April 31st of the current year and then subtracts the date the person was born. This results in a DateInterval from which the year is retrieved and returned.