timezone_name The timezone_name filter returns the timezone name given a timezone identifier: {# Central European Time (Paris) #}
{{ 'Europe/Paris'|timezone_name }}

{# Pacific Time (Los Angeles) #}
{{ 'America/Los_Angeles'|timezone_name }}
 By default, the filter uses the current locale. You can pass it explicitly: {# heure du Pacifique nord-américain (Los Angeles) #}
{{ 'America/Los_Angeles'|timezone_name('fr') }}
  Note The timezone_name filter is part of the IntlExtension which is not installed by default. Install it first: $ composer require twig/intl-extra
 Then, use the twig/extra-bundle on Symfony projects or add the extension explicitly on the Twig environment: 
use Twig\Extra\Intl\IntlExtension;

$twig = new \Twig\Environment(...);
$twig->addExtension(new IntlExtension());
   Arguments  
locale: The locale    « striptags  |  title »  

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{'path': 'public/docs/twig~3/filters/timezone_name.html', 'source': 'DevDocs.IO'}