Install with composer
$ composer require jongotlin/danish-dates-bundle
Add the bundle to your AppKernel.
new JGI\DanishDatesBundle\JGIDanishDatesBundle(),
$date = $container->get('jgi.danish_dates.datemanager')->getDate(new \Datetime('2018-01-01'));
echo $date->getDateTime()->format('Y-m-d') . ": " .
($date->isRedDay() ? 'red day' : 'not red day') . ' - ' . $date->getName();
// 2018-01-01: red day - Nytårsdag
Bundle under the MIT License