fixed bug with twitter feed where it would sometimes say "undefined" if the post was more than a month old

.themes/classic/source/javascripts/twitter.js

@@ -68,7 +68,7 @@ function prettyDate(time) {
   var diff = ((current_date_full - date.getTime()) / 1000);
   var day_diff = Math.floor(diff / 86400);
 
-  if (isNaN(day_diff) || day_diff < 0 || day_diff >= 31) return;
+  if (isNaN(day_diff) || day_diff < 0) return "<span>&infin;</span>";
 
   return day_diff == 0 && (
     diff < 60 && say.just_now ||
@@ -78,5 +78,5 @@ function prettyDate(time) {
     diff < 86400 && Math.floor(diff / 3600) + say.hours_ago) ||
     day_diff == 1 && say.yesterday ||
     day_diff < 7 && day_diff + say.days_ago ||
-    day_diff < 31 && Math.ceil(day_diff / 7) + say.weeks_ago;
+    day_diff > 7 && Math.ceil(day_diff / 7) + say.weeks_ago;
 }