new_contents: # encoding: utf8
  from __future__ import unicode_literals
  
  from django.db import models, migrations
  import datetime
  
  
  class Migration(migrations.Migration):
  
      dependencies = [
          ('upload', '0006_spreadsheetuploadsource'),
      ]
  
      operations = [
          migrations.AlterField(
              model_name='spreadsheetupload',
              name='created_at',
              field=models.DateTimeField(default=datetime.datetime(2014, 6, 5, 17, 18, 33, 707779)),
          ),
      ]
  
subject: add migration