Make sure that menu Parameters (Advanced) are set as:
Category Order: No Order by Primary Order Only
Primary Order: Most Recent First
Open file .../components/com_content/helpers/query.php.
Change the following, about line 50.
function orderbySecondary($orderby)
{
switch ($orderby)
{
case 'date' :
$orderby = 'a.created';
break;
case 'rdate' :
$orderby = 'a.created DESC';
break;
Change value underlined in:
function orderbySecondary($orderby)
{
switch ($orderby)
{
case 'date' :
$orderby = 'a.publish_up';
break;
case 'rdate' :
$orderby = 'a.publish_up DESC';
break;
