...приблизительно так:
```ruby
module PostsHelper
  # ...
  def created_date_for(post)
    created = post.created_at.strftime("%Y/%m/%d")
    link = link_to post.user.fullname, user_posts_path(post.user)
    raw "Created: #{created} by #{link}"
  end
  # ...
end
```
..и потом: ```<p><%= created_date_for post %></p>```