old_contents: from datetime import datetime
  
  from django.db import models
  from django.db.models import Q
  
  
  class BroadcastManager(models.Manager):
      """
      Manager class to show only active broadcast messages
      """
  
      def active(self):
          """Return only active messages"""
          return super(BroadcastManager, self).filter(is_published=True)
  
      def current(self):
          """Return only current and active messages"""
          return self.active().filter(end_time__gte=datetime.now()).filter(
              Q(Q(start_time__lte=datetime.now()) | Q(start_time=None)))
  
      def latest(self):
          """Return the broadcast message to display"""
          try:
              return self.current().order_by("end_time")[0]
          except IndexError:
              return None
  
new_contents: from django.db import models
  from django.db.models import Q
  from django.utils import timezone
  
  
  class BroadcastManager(models.Manager):
      """
      Manager class to show only active broadcast messages
      """
  
      def active(self):
          """Return only active messages"""
          return super(BroadcastManager, self).filter(is_published=True)
  
      def current(self):
          """Return only current and active messages"""
          return self.active().filter(end_time__gte=timezone.now()).filter(
              Q(Q(start_time__lte=timezone.now()) | Q(start_time=None)))
  
      def latest(self):
          """Return the broadcast message to display"""
          try:
              return self.current().order_by("end_time")[0]
          except IndexError:
              return None
  
subject: fix django naive datetime warnings