4 lines relative date formatter with DateInterval and Symfony2 Translator

RelDate.php

<?php

use Symfony\Component\Translation\TranslatorInterface;

function format(\DateTime $date, TranslatorInterface $translator)
{
    $diff = date_create()->diff($date);
    $seconds = $diff->days * 86400 + $diff->h * 3600 + $diff->i * 60 + $diff->s;

    $format = $translator->transChoice('reldate', $seconds);

    return $diff->format($format);
}

test.php

<?php

$translator = new Translator('en');
$translator->addLoader('array', new ArrayLoader());
$translator->addResource('array', array(
    'reldate' => // see http://symfony.com/doc/2.0/book/translation.html#explicit-interval-pluralization
        '[0,60[Just now'
        .'|[60,120[%i minute ago'
        .'|[120,3600[%i minutes ago'
        .'|[3600,7200[%h hour ago'
        .'|[3600,86400[%h hours ago'
        .'|[86400,+Inf[%d days ago',
), 'en');

format(date_create('now - 30 seconds'), $translator); // Just now
format(date_create('now - 2 minutes'), $translator);  // 2 minutes ago
format(date_create('now - 1 hour'), $translator);     // 1 hour ago
format(date_create('now - 5 days'), $translator);     // 5 days ago