list($dbconn) = pnDBGetConn();
$pntable = pnDBGetTables();
$column  = &$pntable[ 'stories_colum' ];
$myquery = buildSimpleQuery ( 'stories' , array ( 'sid', 'title', 'counter' ), $queryalang, "$column[ counter ] DESC", amount);
$result2 = $dbconn->Execute($myquery);

$myquery = buildSimpleQuery ( 'stories' , array ( 'sid', 'title', 'counter' ), $queryalang, "$column[ counter ] DESC, DATE_SUB($column[time], INTERVAL 15 DAY", amount);

DATE_SUB($column[nombre_columna], INTERVAL 15 DAY

list($dbconn) = pnDBGetConn();
//$pntable = pnDBGetTables();
$table = $pntable['stories'];
$column = &$pntable['stories_column'];
//$myquery = buildSimpleQuery ('stories', array ('sid', 'title', 'counter'), $queryalang, "$column[counter] DESC", $amount);
$myquery= "SELECT $column[sid], $column[title], $column[counter]
       FROM $table
       WHERE DATE_SUB(CURRDATE(),INTERVAL 30 DAY) <= UNIX_TIMESTAMP($column[time])
       ORDER BY $column[counter] DESC, $column[time] DESC LIMIT $amount"; 
$result2 = $dbconn->Execute($myquery);

"SELECT $column[sid], $column[title], $column[counter]
FROM $table
WHERE DATE_SUB( CURDATE( ) , INTERVAL 30 DAY ) <= $column[time]
ORDER BY $column[counter] DESC, $column[time] DESC LIMIT $amount"