for thai language use default date format on add and edit form
>>administrator>>components>>com_k2>>views>>item>>view.html.php
inline 137
$created = $item->created ;
/*Debug date format not work for thai lang*//*JHTML::_('date', $item->created, $dateFormat)*/
$publishUp = $item->publish_up;
/*Debug date format not work for thai lang*//*JHTML::_('date', $item->publish_up, $dateFormat)*/
if ((int)$item->publish_down)
{
$publishDown = $item->publish_down;
/*Debug date format not work for thai lang*//*JHTML::_('date', $item->publish_down, $dateFormat)*/
}