$newthreads = round(($timestamp - $lastvisit + 600) / 1000) * 1000;

$today  = mktime (0,0,0,date("m")  ,date("d"),date("Y"));
  $build_date = mktime (0,0,0,1,1,2000);//后面三个数代表你论坛运行第一天的月，日，年。
  $build_days = (int)(($today-$build_date)/(24*3600));

$lastmember

牵手$build_days天
</p>