old_contents: from __future__ import unicode_literals
  from django.contrib.auth.models import User
  from django.db import models
  import uuid
  from cloudinary.models import CloudinaryField
  
  # Create your models here.
  class Post(models.Model):
      uuid = models.UUIDField(unique=True, default=uuid.uuid4, editable=False)
      user = models.ForeignKey(User, on_delete=models.CASCADE)
      markdown = models.BooleanField(default=False)
      content = models.TextField()
      #image = models.ImageField(upload_to="images/post", null=True, blank=True)
      image = CloudinaryField('image', null=True, blank=True)
      PUBLIC = 'PUB'
      FOAF = 'FOF'
      FRIENDS = 'FRS'
      PRIVATE = 'PRV'
      SERVERONLY = 'SVO'
      Visibility_CHOICES = (
          (PUBLIC, 'PUBLIC'),
          (FOAF, 'FOAF'),
          (FRIENDS, 'FRIENDS'),
          (PRIVATE, 'PRIVATE'),
          (SERVERONLY, 'SERVERONLY'),
      )
      visibility = models.CharField(max_length=3, choices=Visibility_CHOICES, default=PRIVATE)
      user_can_view = models.ForeignKey(User, related_name='+', null=True, blank=True)
  
  class Author(models.Model):
      uuid = models.UUIDField(unique=True, default=uuid.uuid4, editable=False)
      user = models.OneToOneField(User, on_delete=models.CASCADE)
      host = models.CharField(max_length=30, default="http://socialp2p.herokuapp.com")
      #photo = models.ImageField(upload_to="images/profile", default="socialp2p/images/profile/default-avatar.jpg", null=True, blank=True)
      photo = CloudinaryField('image', default='image/upload/v1457219004/default-avatar.jpg', blank=True)
      friends = models.ManyToManyField(User, related_name="friend", blank=True)
  
      def friend(self):
          return "friends"
  
  class Comment(models.Model):
      uuid = models.UUIDField(unique=True, default=uuid.uuid4, editable=False)
      user = models.ForeignKey(User, on_delete=models.CASCADE)
      post = models.ForeignKey(Post, on_delete=models.CASCADE)
      content = models.TextField()
      datetime = models.DateTimeField(auto_now=True)
  
  class FriendRequest(models.Model):
      requester = models.ForeignKey(User,related_name="requester", on_delete=models.CASCADE)
      receiver = models.ForeignKey(User,related_name="receiver", on_delete=models.CASCADE)
      accepted = models.BooleanField(default=False)
      datetime = models.DateTimeField(auto_now=True)
  
      def __unicode__(self):
          return self.requester.username + " to " + self.receiver.username
  
      def friend_request(self):
          return "friendrequest"
  
new_contents: from __future__ import unicode_literals
  from django.contrib.auth.models import User
  from django.db import models
  import uuid
  from cloudinary.models import CloudinaryField
  
  # Create your models here.
  class Post(models.Model):
      uuid = models.UUIDField(unique=True, default=uuid.uuid4, editable=False)
      user = models.ForeignKey(User, on_delete=models.CASCADE)
      markdown = models.BooleanField(default=False)
      content = models.TextField()
      #image = models.ImageField(upload_to="images/post", null=True, blank=True)
      image = CloudinaryField('image', null=True, blank=True)
      PUBLIC = 'PUB'
      FOAF = 'FOF'
      FRIENDS = 'FRS'
      PRIVATE = 'PRV'
      SERVERONLY = 'SVO'
      Visibility_CHOICES = (
          (PUBLIC, 'PUBLIC'),
          (FOAF, 'FOAF'),
          (FRIENDS, 'FRIENDS'),
          (PRIVATE, 'PRIVATE'),
          (SERVERONLY, 'SERVERONLY'),
      )
      visibility = models.CharField(max_length=3, choices=Visibility_CHOICES, default=PRIVATE)
      user_can_view = models.ForeignKey(User, related_name='+', null=True, blank=True)
      datetime = models.DateTimeField(auto_now=True)
  
  class Author(models.Model):
      uuid = models.UUIDField(unique=True, default=uuid.uuid4, editable=False)
      user = models.OneToOneField(User, on_delete=models.CASCADE)
      host = models.CharField(max_length=30, default="http://socialp2p.herokuapp.com")
      #photo = models.ImageField(upload_to="images/profile", default="socialp2p/images/profile/default-avatar.jpg", null=True, blank=True)
      photo = CloudinaryField('image', default='image/upload/v1457219004/default-avatar.jpg', blank=True)
      friends = models.ManyToManyField(User, related_name="friend", blank=True)
  
      def friend(self):
          return "friends"
  
  class Comment(models.Model):
      uuid = models.UUIDField(unique=True, default=uuid.uuid4, editable=False)
      user = models.ForeignKey(User, on_delete=models.CASCADE)
      post = models.ForeignKey(Post, on_delete=models.CASCADE)
      content = models.TextField()
      datetime = models.DateTimeField(auto_now=True)
  
  class FriendRequest(models.Model):
      requester = models.ForeignKey(User,related_name="requester", on_delete=models.CASCADE)
      receiver = models.ForeignKey(User,related_name="receiver", on_delete=models.CASCADE)
      accepted = models.BooleanField(default=False)
      datetime = models.DateTimeField(auto_now=True)
  
      def __unicode__(self):
          return self.requester.username + " to " + self.receiver.username
  
      def friend_request(self):
          return "friendrequest"
  
subject: update models.py. add datetime field to post