Hi,
It is possible to have from Saturday, 18 February 2017 17:26 to Aug 21, 2015 in k2 full item ?

Thank you

Hello,

You can use Joomla!"s language overrides.
The language string to override is K2_DATE_FORMAT_LC2

For all of the available options in terms of date formatting you can look here: php.net/manual/en/function.date.php