Use strftime in twig
{{ now|date_modify("+3 day")|strftime('%A') }} //-> Monday (if today is thursday at least :) )
{{ date()|strftime('%I:%M:%S %p') }} //-> Display the current time
{{ '2017-12-01'|strftime('%d %B %Y') }} //-> Accept string filtering (compatible with strtotime)
composer require teraone/twig-strftime-extension
Add the extension to your twig environment
// set your locale
setlocale(LC_ALL, 'de_DE');
$twig->addExtension(new Teraone\Twig\Extension\StrftimeExtension());
// optional: set Timezone
$twig->getExtension('core')->setTimezone('Europe/Berlin');
For the full list of supported time formats have a look at the PHP strftime documentation