Question

I am using emencia.django.newsletter. When I run `python manage.py send_newsletter’ I get this error

if self.newsletter.sending_date <= datetime.now() and \
TypeError: can't compare offset-naive and offset-aware datetimes

This is where the error comes from:

def can_send(self):

    """Check if the newsletter can be sent"""
if self.test:
    return True

if self.newsletter.sending_date <= datetime.now() and\
   (self.newsletter.status == Newsletter.WAITING or\
    self.newsletter.status == Newsletter.SENDING):
    return True

return False

I use Django 1.4

Any ideas?

Answer 1

Your sending_date value is timezone aware, but datetime.now() is timezone naive. As the error message says, you cannot compare them.

The answer is to convert now into a timezone aware datetime before doing the comparison.

import datetime
from django.utils.timezone import utc

now = datetime.datetime.utcnow().replace(tzinfo=utc)
if self.newsletter.sending_date <= now and \
    ...

For more information see the Django docs on naive and aware datetime objects.