Example by default:
{% set date = node.created.value|date("j") ~ ' ' ~ node.created.value|date("F") ~ ' ' ~ node.created.value|date("Y") %}
Example with translation:
{% set date = node.created.value|date("j") ~ ' ' ~ node.created.value|date("F")|t({}, {'context' : 'Long month name'}) ~ ' ' ~ node.created.value|date("Y") %}
