diff --git a/app/controllers/announcements_controller.rb b/app/controllers/announcements_controller.rb
index e8cdf98..68a7d75 100644
--- a/app/controllers/announcements_controller.rb
+++ b/app/controllers/announcements_controller.rb
@@ -164,7 +164,7 @@ class AnnouncementsController < ApplicationController
       else
         cats = ["all"] + cats
       end
-      anns = anns.sort_by { |a| [a["postdate"].blank? ? 1 : 0, a["postdate"].to_time] }
+      anns = anns.sort_by { |a| tmp=a["postdate"].blank?;[tmp ? 1 : 0, tmp ? nil : a["postdate"].to_time] }
     end
     cats = cats.uniq
     tags = tags.uniq
@@ -502,13 +502,13 @@ class AnnouncementsController < ApplicationController
     if devide_flag
       feeds_anns = get_feed_announcements("widget")
       top_anns = top_anns + feeds_anns.select{|v| v['is_top']}
-      top_anns = top_anns.sort_by { |a| [a["postdate"].blank? ? 1 : 0, a["postdate"].to_time] }
+      top_anns = top_anns.sort_by { |a| tmp=a["postdate"].blank?;[tmp ? 1 : 0, tmp ? nil : a["postdate"].to_time] }
       rest_count = widget_data_count - top_anns.count
       if rest_count <= 0
         anns = top_anns.take(widget_data_count)
       else
         rest_all_anns = feeds_anns.select{|v| v['is_top'] != true} + not_top_anns.take(rest_count)
-        rest_anns = rest_all_anns.sort_by { |a| [a["postdate"].blank? ? 1 : 0, a["postdate"].to_time] }.take(rest_count)
+        rest_anns = rest_all_anns.sort_by { |a| tmp=a["postdate"].blank?;[tmp ? 1 : 0, tmp ? nil : a["postdate"].to_time] }.take(rest_count)
         anns = top_anns + rest_anns
       end
     end
diff --git a/app/helpers/announcements_helper.rb b/app/helpers/announcements_helper.rb
index 94bb7c4..6e9a719 100644
--- a/app/helpers/announcements_helper.rb
+++ b/app/helpers/announcements_helper.rb
@@ -243,10 +243,10 @@ module AnnouncementsHelper
       if announcements.count != 0
         top_anns = announcements.select{|v| v.is_top} + feeds_anns.select{|v| v['is_top']}
         rest_all_anns = feeds_anns.select{|v| v['is_top'] != true} + announcements.select{|v| !v.is_top}
-        rest_anns = rest_all_anns.sort_by { |a| [a["postdate"].blank? ? 1 : 0, a["postdate"].to_time] }
-        all_sorted = top_anns.sort_by { |a| [a["postdate"].blank? ? 1 : 0, a["postdate"].to_time] } + rest_anns
+        rest_anns = rest_all_anns.sort_by { |a| tmp=a["postdate"].blank?;[tmp ? 1 : 0, tmp ? nil : a["postdate"].to_time] }
+        all_sorted = top_anns.sort_by { |a| tmp=a["postdate"].blank?;[tmp ? 1 : 0, tmp ? nil : a["postdate"].to_time] } + rest_anns
       else
-        all_sorted = feeds_anns.select{|v| v['is_top']}.sort_by { |a| [a["postdate"].blank? ? 1 : 0, a["postdate"].to_time] } + feeds_anns.select{|v| v['is_top'] != true}.sort_by { |a| [a["postdate"].blank? ? 1 : 0, a["postdate"].to_time] }
+        all_sorted = feeds_anns.select{|v| v['is_top']}.sort_by { |a| tmp=a["postdate"].blank?;[tmp ? 1 : 0, tmp ? nil : a["postdate"].to_time] } + feeds_anns.select{|v| v['is_top'] != true}.sort_by { |a| tmp=a["postdate"].blank?;[tmp ? 1 : 0, tmp ? nil : a["postdate"].to_time] }
       end
       all_filter = filter_by_keywords(all_sorted,params[:keywords],params[:stime],params[:etime])
     else