old_contents: from django.db import models
  
  from pyconcz_2016.conferences.models import Conference
  
  
  class Cfp(models.Model):
      conference = models.ForeignKey(Conference, related_name="cfps")
      title = models.CharField(max_length=200)
  
      date_start = models.DateTimeField()
      date_end = models.DateTimeField()
  
      class Meta:
          ordering = ['date_start']
  
      def __str__(self):
          return self.title
  
  
  class Proposal(models.Model):
      DIFFICULTY = (
          ('all', 'All'),
          ('beginner', 'Beginner'),
          ('advanced', 'Advanced'),
      )
  
      cfp = models.ForeignKey(Cfp, related_name='proposals')
  
      # Public speaker info
      full_name = models.CharField(max_length=200)
      bio = models.TextField()
      twitter = models.CharField(max_length=20, blank=True)
      github = models.CharField(max_length=20, blank=True)
  
      # Public talk info
      title = models.CharField(max_length=200)
      abstract = models.TextField()
      difficulty = models.CharField(
          max_length=10, choices=DIFFICULTY, default='all')
  
      # Private notes (for reviewers only)
      note = models.TextField()
  
new_contents: from django.db import models
  from django.utils.timezone import now
  
  from pyconcz_2016.conferences.models import Conference
  
  
  class Cfp(models.Model):
      conference = models.ForeignKey(Conference, related_name="cfps")
      title = models.CharField(max_length=200)
  
      date_start = models.DateTimeField()
      date_end = models.DateTimeField()
  
      class Meta:
          ordering = ['date_start']
  
      def __str__(self):
          return self.title
  
  
  class Proposal(models.Model):
      DIFFICULTY = (
          ('all', 'All'),
          ('beginner', 'Beginner'),
          ('advanced', 'Advanced'),
      )
  
      cfp = models.ForeignKey(Cfp, related_name='proposals')
  
      # Public speaker info
      full_name = models.CharField(max_length=200)
      bio = models.TextField()
      twitter = models.CharField(max_length=20, blank=True)
      github = models.CharField(max_length=20, blank=True)
  
      # Public talk info
      title = models.CharField(max_length=200)
      abstract = models.TextField()
      difficulty = models.CharField(
          max_length=10, choices=DIFFICULTY, default='all')
  
      # Private notes (for reviewers only)
      note = models.TextField()
      date = models.DateTimeField(default=now)
  
subject: Add date and social media fields to proposal