K2 article and Date format - where can i change it?

Hello I wold like to change the date format in k2 article. Where is the file to change? I have changed languages/en-GB/en-GB.com_k2.ini and languages/en-GB/en-GB.mod_k2_content.ini but the date is still in the same format...

Please open file : root/templates/gk_game_magazine/html/com_k2/templates/default/item.php and there find this lines :

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 <time datetime="<?php echo JHtml::_('date', $this->item->created, JText::_(DATE_W3C)); ?>">
                        <?php echo JHTML::_('date', $this->item->created , JText::_('l, d F Y')); ?>
                      </time>

As you may see in this part JText::_('l, d F Y')) you can change the date format.