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Getting 'can't subtract offset-naive and offset-aware datetimes'

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At a few places in the codebase, I'm getting the error that I can't subtract offset-naive and offset-aware datetimes. I tried fixing it in one place in the source, but ran into it somewhere else. Any advice?


Request Method: GET
Request URL:

Django Version: 1.4.1
Python Version: 2.7.3
Installed Applications:
Installed Middleware:

File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python2.7/dist-packages/askbot/views/" in questions
  235.             'update_avatar_data': schedules.should_update_avatar_data(request),
File "/usr/local/lib/python2.7/dist-packages/askbot/" in should_update_avatar_data
  11.         if ( - user.last_login).days <= 1:

Exception Type: TypeError at /questions/
Exception Value: can't subtract offset-naive and offset-aware datetimes
yjkogan's avatar
asked 2013-04-03 23:49:41 -0500
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1 Answer


Answered my own question.

The default file created by (at least in django 1.5) sets USE_TZ to True.

Just set USE_TZ to False, or simply remove it from the settings file, since in the absence of a directive the value is assumed to be False.

yjkogan's avatar
answered 2013-04-04 01:31:16 -0500
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We've not tested yet Askbot with django 1.5, in fact in the repository version, we've added an upper limit for the django version. Does askbot work for you in 1.5?

Evgeny's avatar Evgeny (2013-04-04 21:16:00 -0500) edit

I think I ran into a different issue with 1.5 specific to installation and had to roll it back in order to get askbot working. However, I initialized the repo with 1.5 b/c they changed the directory format in 1.4 (i think) and I wanted my project to match the new format. Managed to get that working with medium-low pain level

yjkogan's avatar yjkogan (2013-04-05 02:00:43 -0500) edit
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