title: How to add date and time under each post in guestbook in google app engine
body: <p>here is the code:</p>
  
  <pre><code>import cgi
  import datetime
  import wsgiref.handlers
  
  from google.appengine.ext import db
  from google.appengine.api import users
  from google.appengine.ext import webapp
  
  class Greeting(db.Model):
    author = db.UserProperty()
    content = db.StringProperty(multiline=True)
    date = db.DateTimeProperty(auto_now_add=True)
  
  
  class MainPage(webapp.RequestHandler):
      def get(self):
          self.response.out.write('&lt;html&gt;&lt;body&gt;')
  
          greetings = db.GqlQuery("SELECT * FROM Greeting ORDER BY date DESC LIMIT 10")
          for greeting in greetings:
  
              if greeting.author:
                  self.response.out.write('&lt;b&gt;%s&lt;/b&gt; wrote:' % greeting.author.nickname())
  
              else:
                  self.response.out.write('An anonymous person wrote:')
              self.response.out.write('&lt;blockquote&gt;%s&lt;/blockquote&gt;' %
                                      cgi.escape(greeting.content))
  
  
  
          # Write the submission form and the footer of the page
          self.response.out.write("""
                &lt;form action="/sign" method="post"&gt;
                  &lt;div&gt;&lt;textarea name="content" rows="3" cols="60"&gt;&lt;/textarea&gt;&lt;/div&gt;
                  &lt;div&gt;&lt;input type="submit" value="Sign Guestbook"&gt;&lt;/div&gt;
                &lt;/form&gt;
              &lt;/body&gt;
            &lt;/html&gt;""")
  
  class Guestbook(webapp.RequestHandler):
    def post(self):
      greeting = Greeting()
  
      if users.get_current_user():
        greeting.author = users.get_current_user()
  
      greeting.content = self.request.get('content')
      greeting.put()
      self.redirect('/')
  
  
  application = webapp.WSGIApplication([
    ('/', MainPage),
    ('/sign', Guestbook)
  ], debug=True)
  
  
  def main():
    wsgiref.handlers.CGIHandler().run(application)
  
  
  if __name__ == '__main__':
    main()
  </code></pre>