diff --git a/app/controllers/announcements_controller.rb b/app/controllers/announcements_controller.rb
index f91d4d6..e8cdf98 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{|v1,v2| v2["postdate"]<=>v1["postdate"]}
+      anns = anns.sort_by { |a| [a["postdate"].blank? ? 1 : 0, a["postdate"].to_time] }
     end
     cats = cats.uniq
     tags = tags.uniq
@@ -500,16 +500,16 @@ class AnnouncementsController < ApplicationController
       anns = anns_cache.first.filter_result
     end
     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] }
       rest_count = widget_data_count - top_anns.count
       if rest_count <= 0
-        anns = top_anns
+        anns = top_anns.take(widget_data_count)
       else
-        feeds_anns = get_feed_announcements("widget")
-        top_anns = top_anns + feeds_anns.select{|v| v['is_top']}
-        top_anns = top_anns.sort{|v1,v2| v2["postdate"]<=>v1["postdate"]}
         rest_all_anns = feeds_anns.select{|v| v['is_top'] != true} + not_top_anns.take(rest_count)
-        rest_anns = rest_all_anns.sort{|v1,v2| v2["postdate"]<=>v1["postdate"]}.take(rest_count)
-        anns = (top_anns + rest_anns).take(widget_data_count)
+        rest_anns = rest_all_anns.sort_by { |a| [a["postdate"].blank? ? 1 : 0, a["postdate"].to_time] }.take(rest_count)
+        anns = top_anns + rest_anns
       end
     end
     anns.each{|a| a["postdate"] = a["postdate"].in_time_zone(Time.zone.utc_offset / 3600).strftime('%Y-%m-%d %H:%M') rescue nil }
diff --git a/app/helpers/announcements_helper.rb b/app/helpers/announcements_helper.rb
index 520efa0..94bb7c4 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{|v1,v2| v2["postdate"]<=>v1["postdate"]}
-        all_sorted = top_anns.sort{|v1,v2| v2["postdate"]<=>v1["postdate"]} + rest_anns
+        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
       else
-        all_sorted = feeds_anns.select{|v| v['is_top']}.sort{|v1,v2| v2["postdate"]<=>v1["postdate"]} + feeds_anns.select{|v| v['is_top'] != true}.sort{|v1,v2| v2["postdate"]<=>v1["postdate"]}
+        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] }
       end
       all_filter = filter_by_keywords(all_sorted,params[:keywords],params[:stime],params[:etime])
     else