diff --git a/app/controllers/comments_controller.rb b/app/controllers/comments_controller.rb
index f6e4f7fb..01dcd9d5 100644
--- a/app/controllers/comments_controller.rb
+++ b/app/controllers/comments_controller.rb
@@ -19,6 +19,8 @@ class CommentsController < ApplicationController
       @comments = Comment.where(file_id: params[:file_id])
       @comments.map{|comment|
         comment.username = comment.user.displayname
+        comment.date = comment.created_at.strftime('%d.%m.%Y %k:%M')
+        comment.updated = (comment.created_at != comment.updated_at)
       }
     else
       @comments = []
diff --git a/app/models/comment.rb b/app/models/comment.rb
index ceeb9c36..a5946ac9 100644
--- a/app/models/comment.rb
+++ b/app/models/comment.rb
@@ -1,7 +1,7 @@
 class Comment < ActiveRecord::Base
   # inherit the creation module: encapsulates that this is a polymorphic user, offers some aliases and makes sure that all necessary attributes are set.
   include Creation
-  attr_accessor :username
+  attr_accessor :username, :date, :updated
 
   belongs_to :file, class_name: 'CodeOcean::File'
   belongs_to :user, polymorphic: true
diff --git a/app/views/comments/index.json.jbuilder b/app/views/comments/index.json.jbuilder
index 85172014..55dfac49 100644
--- a/app/views/comments/index.json.jbuilder
+++ b/app/views/comments/index.json.jbuilder
@@ -1,4 +1,4 @@
 json.array!(@comments) do |comment|
-  json.extract! comment, :id, :user_id, :file_id, :row, :column, :text, :username
+  json.extract! comment, :id, :user_id, :file_id, :row, :column, :text, :username, :date, :updated
   json.url comment_url(comment, format: :json)
 end