diff --git a/app/controllers/news_controller.rb b/app/controllers/news_controller.rb
index 2936bc1..841d1e4 100644
--- a/app/controllers/news_controller.rb
+++ b/app/controllers/news_controller.rb
@@ -205,13 +205,13 @@ class NewsController < ApplicationController
     link = page.nil? ? "#" : "/#{I18n.locale.to_s + page.url}/"
     categories_for_dropdown.unshift({"name" => t("news.all"), "category-link"  => link})
     
-    hot_news = NewsBulletin.where(:title.ne => "",:is_preview.in=>[false,nil], :category_id.in => categories.collect{|cat| cat.id}, :is_hot => true).can_display.is_approved.desc(:created_at).limit(1)
+    hot_news = NewsBulletin.where(:title.ne => "",:is_preview.in=>[false,nil], :category_id.in => categories.collect{|cat| cat.id}, :is_hot => true).can_display.is_approved.desc(:postdate).limit(1)
     hot_news = hot_news.first
     categories.each_with_index do |category,index|
       if hot_news.nil?
-        nbs = NewsBulletin.where(:title.ne => "",:is_preview.in=>[false,nil], :category_id => category.id).can_display.is_approved.desc(:created_at).limit(OrbitHelper.widget_data_count)
+        nbs = NewsBulletin.where(:title.ne => "",:is_preview.in=>[false,nil], :category_id => category.id).can_display.is_approved.desc(:postdate).limit(OrbitHelper.widget_data_count)
       else
-        nbs = NewsBulletin.where(:id.ne => hot_news.id, :title.ne => "",:is_preview.in=>[false,nil], :category_id => category.id).can_display.is_approved.desc(:created_at).limit(OrbitHelper.widget_data_count)
+        nbs = NewsBulletin.where(:id.ne => hot_news.id, :title.ne => "",:is_preview.in=>[false,nil], :category_id => category.id).can_display.is_approved.desc(:postdate).limit(OrbitHelper.widget_data_count)
       end
         temp = nbs.collect do |nb|
           {