diff --git a/html/inc/text_transform.inc b/html/inc/text_transform.inc
index 8268dfb457..ce4c0cacac 100644
--- a/html/inc/text_transform.inc
+++ b/html/inc/text_transform.inc
@@ -101,32 +101,54 @@ function get_output_options($user) {
     return $options;
 }
 
-// Converts bbcode to proper HTML
+// Converts bbcode to HTML
 // If $export is true, don't use BOINC CSS
 
-// handle [pre] separately because we need to remove <br />s
+// handle [pre] and [code] separately because we need to remove <br />s
 //
-function replace_pre($text, $export) {
+function replace_pre_code($text, $export) {
     if ($export) {
-        return preg_replace_callback(
+        $text = preg_replace_callback(
             "@\[pre\](.*?)\[/pre\]@is",
             function ($matches) {
                 $x = remove_br(substr($matches[0], 5, -6));
                 $x = htmlspecialchars($x);
+                $x = str_replace("[", "&#91;", $x);
                 return "<pre>$x</pre>";
             },
             $text
         );
-    } else {
         return preg_replace_callback(
+            "@\[code\](.*?)\[/code\]@is",
+            function ($matches) {
+                $x = remove_br(substr($matches[0], 6, -7));
+                $x = htmlspecialchars($x);
+                $x = str_replace("[", "&#91;", $x);
+                return "<code>$x</code>";
+            },
+            $text
+        );
+    } else {
+        $text = preg_replace_callback(
             "@\[pre\](.*?)\[/pre\]@is",
             function ($matches) {
                 $x = remove_br(substr($matches[0], 5, -6));
                 $x = htmlspecialchars($x);
+                $x = str_replace("[", "&#91;", $x);
                 return "<div class=\"pre\">$x</div>";
             },
             $text
         );
+        return preg_replace_callback(
+            "@\[code\](.*?)\[/code\]@is",
+            function ($matches) {
+                $x = (substr($matches[0], 6, -7));
+                $x = htmlspecialchars($x);
+                $x = str_replace("[", "&#91;", $x);
+                return "<div class=\"code\">$x</div>";
+            },
+            $text
+        );
     }
 }
 
@@ -135,7 +157,6 @@ function bb2html($text, $export=false) {
     $httpsregex = "(?:\"?)https\:\/\/([^\[\"<\ ]+)(?:\"?)";
     // List of allowable tags
     $bbtags = array (
-        "@\[code\](.*?)\[/code\]@is",
         "@\[b\](.*?)\[/b\]@is",
         "@\[i\](.*?)\[/i\]@is",
         "@\[u\](.*?)\[/u\]@is",
@@ -168,7 +189,6 @@ function bb2html($text, $export=false) {
     // What the above tags are turned in to
     if ($export) {
         $htmltags = array (
-            "<code>\\1</code>",
             "<b>\\1</b>",
             "<i>\\1</i>",
             "<u>\\1</u>",
@@ -196,7 +216,6 @@ function bb2html($text, $export=false) {
         );
     } else {
         $htmltags = array (
-            "<div class=\"code\">\\1</div>",
             "<b>\\1</b>",
             "<i>\\1</i>",
             "<u>\\1</u>",
@@ -230,7 +249,7 @@ function bb2html($text, $export=false) {
     // $i<1000 to prevent DoS
     while ($text != $lasttext && $i<1000) {
         $lasttext = $text;
-        $text = replace_pre($text, $export);
+        $text = replace_pre_code($text, $export);
         $text = preg_replace($bbtags, $htmltags, $text);
         $i = $i + 1;
     }
diff --git a/html/inc/time.inc b/html/inc/time.inc
index b19c5a2ebe..fa69f770ea 100644
--- a/html/inc/time.inc
+++ b/html/inc/time.inc
@@ -16,7 +16,8 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with BOINC.  If not, see <http://www.gnu.org/licenses/>.
 
-// express a time difference in readable form
+// express a time difference in readable form, e.g. "7 days ago".
+// If it's more than 30 days, just show the date
 //
 function time_diff_str($t1, $t2) {
     if (!$t1 || !$t2) return "---";
@@ -26,6 +27,9 @@ function time_diff_str($t1, $t2) {
         $post="";
         $diff=-$diff;
     } else {
+        if ($diff > 86400*30) {
+            return date_str($t1);
+        }
         $pre="";
         $post=" ago";
     }
diff --git a/html/user/bbcode.php b/html/user/bbcode.php
index e5c46049ca..88534d6808 100644
--- a/html/user/bbcode.php
+++ b/html/user/bbcode.php
@@ -46,8 +46,6 @@ row2_plain("[trac]#1[/trac] or [trac]ticket:1[/trac]",
     tra("use to link to Trac ticket on BOINC website").": <a href=\"http://boinc.berkeley.edu/trac/ticket/1\">#1</a>");
 row2_plain("[trac]wiki:WebForum[/trac]",
     tra("use to link to Trac Wiki on BOINC website").": <a href=\"http://boinc.berkeley.edu/trac/wiki/WebForum\">WebForum</a>");
-row2_plain("[trac]changeset:12345[/trac]",
-    tra("use to link to SVN changeset on BOINC website").": <a href=\"http://boinc.berkeley.edu/trac/changeset/12345\">[12345]</a>");
 end_table();
 
 echo "<p>