Here's the ticket that added support for TIME_ZONE=None: 
https://code.djangoproject.com/ticket/1480

On Monday, October 10, 2016 at 3:50:51 PM UTC-4, Aymeric Augustin wrote:
>
> On 10 Oct 2016, at 21:31, Tim Graham <timog...@gmail.com <javascript:>> 
> wrote:
>
> I forgot to mention (and document) that (if I'm following the code 
> correctly) this change removes support for setting TIME_ZONE=None. 
> According to the docs, TIME_ZONE=None "causes cause Django to fall back to 
> using the system timezone. However, this is discouraged when USE_TZ = True 
> <https://groups.google.com/forum/#std:setting-USE_TZ>, because it makes 
> conversions between local time and UTC less reliable." Is removing that 
> option acceptable as a backwards-incompatible change?
>
>
> I don’t have an opinion on that.
>
> I don’t think USE_TZ = None provides a particularly useful behavior. I 
> think it’s best to state the expected value explicitly.
>
> Perhaps that option was implemented because someone asked for it? I don’t 
> remember.
>
> -- 
> Aymeric.
>
>

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