Timezone on User Document in UserBundle Twig Extension

config.yml

....

services:
    twig.extension.DateTimeTimeZone:
        class: Acme\DemoBundle\Twig\Extension\DateTimeTimeZone
        tags:
            - { name: twig.extension }
        arguments: [ @security.context ]

DateTimeTimeZone.php

<?php

// Acme/DemoBundle/Twig/Extension/DateTimeTimeZone.php

namespace Acme\DemoBundle\Twig\Extension;

use Symfony\Component\Security\Core\SecurityContext;
use Acme\DemoBundle\Document\User as User;

class DateTimeTimeZone extends \Twig_Extension
{
    private $security;
    
    public function __construct($security = null) {
        $this->security = $security;
    }
    
    public function getFilters()
    {
        return array(
            'date_time_time_zone' => new \Twig_Filter_Method($this, 'twig_date_time_zone_format_filter'),
        );
    }
    
    public function getName()
    {
        return 'DateTimeTimeZone';
    }
    
    public function twig_date_time_zone_format_filter(\DateTime $date, $format = 'F j, Y H:i')
    {
        if ($this->security instanceof SecurityContext) {
            $user = $this->security->getToken()->getUser();
            if ($user instanceof User) {
                $date->setTimezone(new \DateTimeZone($user->getTimeZone()));
            }
        }
        
        return $date->format($format);
    }
}

index.html.twig

<div>Created: {{ object.getCreatedAt|date_time_time_zone('F jS \\a\\t g:ia') }}</div>