[Admin]

In search.php find

PHP Code:

// ###################### Start posts by user x ####################### 


And above it put

PHP Code:

// ###################### Start get double-daily #######################
if ($action=="getddaily") {
  // get allowable forums:
  $forumsql=getallforumsql();

  // get date:
  $datesql=" AND thread.lastpost>=".(time()-24*60*60*2);

  $wheresql="1=1".$forumsql.$datesql;
  $wheresql.=" AND thread.open<>10";
  if ($getsearch=$DB_site->query_first("SELECT searchid FROM search WHERE query='".addslashes($wheresql)."'")) {
    $searchid=$getsearch[searchid];
  } else {
    // get last search for this user and check floodcheck
    if ($prevsearch=$DB_site->query_first("SELECT searchid,dateline FROM search WHERE ".iif($bbuserinfo[userid]==0,"ipaddress='$ipaddress'","userid=$bbuserinfo[userid]")." ORDER BY dateline DESC LIMIT 1")) {
      if (time()-$prevsearch[dateline]<$searchfloodcheck and $searchfloodcheck!=0) { // and !ismoderator()) {
                                eval("standarderror(\"".gettemplate("error_searchfloodcheck")."\");");
                                exit;
      }
    }
                // insert query into db
                $DB_site->query("INSERT INTO search (searchid,query,dateline,querystring,showposts,userid,ipaddress) VALUES (NULL,'".addslashes($wheresql)."',".time().",'".addslashes($query)."',0,$bbuserinfo[userid],'".addslashes($ipaddress)."')");
                $searchid=$DB_site->insert_id();
  }


  eval("standardredirect(\"".gettemplate("redirect_search")."\",\"search.php?s=$session[sessionhash]&action=showresults&getnew=true&searchid=$searchid\");");
}

// ###################### Start get triple-daily #######################
if ($action=="gettdaily") {
  // get allowable forums:
  $forumsql=getallforumsql();

  // get date:
  $datesql=" AND thread.lastpost>=".(time()-24*60*60*3);

  $wheresql="1=1".$forumsql.$datesql;
  $wheresql.=" AND thread.open<>10";
  if ($getsearch=$DB_site->query_first("SELECT searchid FROM search WHERE query='".addslashes($wheresql)."'")) {
    $searchid=$getsearch[searchid];
  } else {
    // get last search for this user and check floodcheck
    if ($prevsearch=$DB_site->query_first("SELECT searchid,dateline FROM search WHERE ".iif($bbuserinfo[userid]==0,"ipaddress='$ipaddress'","userid=$bbuserinfo[userid]")." ORDER BY dateline DESC LIMIT 1")) {
      if (time()-$prevsearch[dateline]<$searchfloodcheck and $searchfloodcheck!=0) { // and !ismoderator()) {
                                eval("standarderror(\"".gettemplate("error_searchfloodcheck")."\");");
                                exit;
      }
    }
                // insert query into db
                $DB_site->query("INSERT INTO search (searchid,query,dateline,querystring,showposts,userid,ipaddress) VALUES (NULL,'".addslashes($wheresql)."',".time().",'".addslashes($query)."',0,$bbuserinfo[userid],'".addslashes($ipaddress)."')");
                $searchid=$DB_site->insert_id();
  }


  eval("standardredirect(\"".gettemplate("redirect_search")."\",\"search.php?s=$session[sessionhash]&action=showresults&getnew=true&searchid=$searchid\");");
} 


Now just link to search.php?action=getddaily (note: two d's) for posts from two days ago, and search.php?action=gettdaily (note: two t's) for posts from three days ago. Posts from today are search.php?action=getdaily.
You can make the box itself by yourself.

Hope I helped.