old_contents: import datetime
  from decimal import Decimal
  
  from django.core.serializers.json import DjangoJSONEncoder
  
  DATETIME = (datetime.datetime,)
  DATE = (datetime.date,)
  TIME = (datetime.time,)
  
  try:
      import freezegun.api
  except ImportError:
      pass
  else:
      DATETIME += (freezegun.api.FakeDatetime,)
      DATE += (freezegun.api.FakeDate,)
      
  class TZAwareJSONEncoder(DjangoJSONEncoder):
      def default(self, obj):
          if isinstance(obj, DATETIME):
              return obj.strftime("%Y-%m-%d %H:%M:%S%z")
          return super(TZAwareJSONEncoder, self).default(obj)
  
  def default(o):
      if hasattr(o, 'to_json'):
          return o.to_json()
      if isinstance(o, Decimal):
          return str(o)
      if isinstance(o, DATETIME):
          if o.tzinfo:
              return o.strftime('%Y-%m-%dT%H:%M:%S%z')
          return o.strftime("%Y-%m-%dT%H:%M:%S")
      if isinstance(o, DATE):
          return o.strftime("%Y-%m-%d")
      if isinstance(o, TIME):
          if o.tzinfo:
              return o.strftime('%H:%M:%S%z')
          return o.strftime("%H:%M:%S")
      
      raise TypeError(repr(o) + " is not JSON serializable")
  
new_contents: import datetime
  from decimal import Decimal
  
  from django.core.serializers.json import DjangoJSONEncoder
  
  class TZAwareJSONEncoder(DjangoJSONEncoder):
      def default(self, obj):
          if isinstance(obj, datetime.datetime):
              return obj.strftime("%Y-%m-%d %H:%M:%S%z")
          return super(TZAwareJSONEncoder, self).default(obj)
  
  def default(o):
      if hasattr(o, 'to_json'):
          return o.to_json()
      if isinstance(o, Decimal):
          return str(o)
      if isinstance(o, datetime.datetime):
          if o.tzinfo:
              return o.strftime('%Y-%m-%dT%H:%M:%S%z')
          return o.strftime("%Y-%m-%dT%H:%M:%S")
      if isinstance(o, datetime.date):
          return o.strftime("%Y-%m-%d")
      if isinstance(o, datetime.time):
          if o.tzinfo:
              return o.strftime('%H:%M:%S%z')
          return o.strftime("%H:%M:%S")
      
      raise TypeError(repr(o) + " is not JSON serializable")
  
subject: Revert changes: freezegun has been updated.