birthday.php

<?php

$date = $argv[1] ?? null;
$curdate = $argv[2] ?? 'now';

if (empty($date)){
   die('Date: '.$date.' is invalid. Use first argument for date of birth and second argument for date to calculate from like:'.
       "\nphp birthday.php \"Nov 1, 1984\" \"Mar 1, 2004\""."\n");
}
try{
	$dt = new \DateTime($date);
	$curdt = new \DateTime($curdate);
	$age = $dt->diff($curdt)->y;
	echo $age."\n";

}catch(\Throwable $e){
  die($e->getMessage()."\n");
}