Cross posted to django-developers: 
https://groups.google.com/d/topic/django-developers/sIjOXpbQWZ0/discussion

In the future, please keep the conversation in one place. django-users is 
fine for asking "is it a bug?" questions.

My reply from django-developers:

I couldn't find any testing of TruncDay with Value().

Is there a difference between the query you're trying to construct and 
MyModel.objects.filter(created__lt=timezone.now().date()) ?

On Friday, June 2, 2017 at 5:15:23 AM UTC-4, Michal Petrucha wrote:
>
> On Thu, Jun 01, 2017 at 02:29:17AM -0700, Roshan Raghupathy wrote: 
> > Hi, 
> > I came across an issue yesterday. Post on stackoverflow 
> > <
> https://stackoverflow.com/questions/44287443/incorrect-escaping-in-django-sql-query>
>  
>
> > 
> > On further investigation today, I think I found the source of the issue. 
> > It's this line 
> > <
> https://github.com/django/django/blob/master/django/db/models/functions/datetime.py#L149>.
>  
>
> > The parameters which are escaped here are never reverted back to the 
> > original form. 
> > I tested a dirty fix by converting all '%%s' to '%s' and the query 
> worked. 
> > Should I submit a bug? Has it been submitted already? 
>
> Hi Roshan, 
>
> I just took a quick look, and it seems you are right – in all of the 
> official backend implementations, the *_trunc_sql only use the second 
> argument in the right-hand side of string formatting, so this 
> double-percent escaping appears to be wrong there. 
>
> I did a quick search through the issue tracker, and didn't find 
> anything about this issue, would you mind submitting a new bug report? 
> It would be best if you could include a complete minimal example that 
> we could easily run to reproduce the problem. 
>
> Thanks, 
>
> Michal 
>

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