diff --git a/app/api/mobile/entities/course.rb b/app/api/mobile/entities/course.rb
index ec00579ce..977c32c48 100644
--- a/app/api/mobile/entities/course.rb
+++ b/app/api/mobile/entities/course.rb
@@ -1,6 +1,7 @@
 module Mobile
   module Entities
     class Course < Grape::Entity
+      include Redmine::I18n
       def self.course_expose(field)
         expose field do |f,opt|
           c = nil
@@ -12,6 +13,8 @@ module Mobile
           if field == :img_url
             f[field] if f.is_a?(Hash) && f.key?(field)
             #f.img_url if f.respond_to?(:img_url)
+          elsif field == :created_at || field == :updated_at
+            (format_time(c[field]) if (c.is_a?(Hash) && c.key?(field))) || (format_time(c.send(field)) if c.respond_to?(field))
           else
             (c[field] if (c.is_a?(Hash) && c.key?(field))) || (c.send(field) if c.respond_to?(field))
           end
diff --git a/app/api/mobile/entities/homework_jours.rb b/app/api/mobile/entities/homework_jours.rb
index 63c6997fd..0b9defe67 100644
--- a/app/api/mobile/entities/homework_jours.rb
+++ b/app/api/mobile/entities/homework_jours.rb
@@ -6,7 +6,11 @@ module Mobile
       def self.homework_jours_expose(field)
         expose field do |f,opt|
           if f.is_a?(Hash) && f.key?(field)
-            f[field]
+            if field == :created_at
+              format_time(f[field])
+            else
+              f[field]
+            end
           elsif f.is_a?(::SeemsRateableRates)
 
           end
diff --git a/app/api/mobile/entities/news.rb b/app/api/mobile/entities/news.rb
index 406db59e4..f189771e3 100644
--- a/app/api/mobile/entities/news.rb
+++ b/app/api/mobile/entities/news.rb
@@ -1,6 +1,7 @@
 module Mobile
   module Entities
     class News < Grape::Entity
+      include Redmine::I18n
       def self.news_expose(field)
         expose field do |f,opt|
           if f.is_a?(Hash) && f.key?(field)
@@ -9,13 +10,18 @@ module Mobile
             n = f[:news]
             comments = f[:comments]
             if n.is_a?(::News)
-              n.send(field) if n.respond_to?(field)
+              if field == :created_on
+                format_time(n.send(field)) if n.respond_to?(field)
+              else
+                n.send(field) if n.respond_to?(field)
+              end
+
             end
 
           end
         end
       end
-
+      news_expose :id
       #新闻标题
       news_expose :title
 
diff --git a/app/services/courses_service.rb b/app/services/courses_service.rb
index f4201774a..7ed8fe65a 100644
--- a/app/services/courses_service.rb
+++ b/app/services/courses_service.rb
@@ -117,7 +117,7 @@ class CoursesService
     scope = @course ? @course.news.course_visible(current_user) : News.course_visible(current_user)
     news = []
     scope.each do |n|
-      news << {:title => n.title,:author_name => n.author.name,:author_id => n.author.id, :description => n.description,:created_on => format_time(n.created_on),:comments_count => n.comments_count}
+      news << {:id => n.id,:title => n.title,:author_name => n.author.name,:author_id => n.author.id, :description => n.description,:created_on => format_time(n.created_on),:comments_count => n.comments_count}
     end
     news
   end