Show full date - twig format?

What is the twig format to output this date format?

2016-10-10T14:37:15+00:00

Twig uses the PHP date time format, but i think that particular one is simply c which is the shortcode for ISO 8601 - http://php.net/manual/en/function.date.php

@rhukster - big thanks! It works! How did I overlook it? 😂

P.S. Do you allow to add paid themes to the theme list of official Grav site?