I just noticed that none of my posts older than a decade could be listed:

The culprit was in the following function, where I had to add "century" and "10" to the lists of $periods and $lengths respectively.

function bigsmoke_ago($timestamp_gmt)                                                    
{                                                                                        
  $difference = current_time('timestamp', true) - $timestamp_gmt;                        
  $periods = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
  $lengths = array("60","60","24","7","4.35","12","10");                                 
                                                                                         
  for($j = 0; $difference >= $lengths[$j]; $j++)                                         
    $difference /= $lengths[$j];                                                         
  $difference = round($difference);                                                      
                                                                                         
  if($difference != 1) $periods[$j].= "s";                                               
  $text = "$difference $periods[$j] ago";                                                
                                                                                         
  if ($j < 3) {                                                                          
    $current_day = date('j', current_time('timestamp', true));                           
    $arg_day = date('j', $timestamp_gmt);                                                
    $relative_day = ($current_day == $arg_day ? 'today' : 'yesterday');
                          
    $text = "$relative_day, $text";                                                      
  }                                                                                      
                                                                                         
  return $text;                                                                          
}

While add it, I also got rid of the useless Google ads.

Plus, I improved the link text replacement for posts without comments and commenting turned off.