#29884: QuerySet.filter() with TruncBase functions not working as expected when
USE_TZ= True
-------------------------------------+-------------------------------------
Reporter: slide333333 | Owner: (none)
Type: Bug | Status: new
Component: Database layer | Version: 2.1
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Simon Charette):
> One thing I notice is that make_aware is surprisingly not the same thing
as adding the tzinfo to the datetime in the first place.
Except for the `TIME_ZONE` setting omission that
[https://groups.google.com/d/msg/django-
developers/cyqlZnN3HUQ/CRhOOft1AwAJ Aymeric mentioned on the mailing list]
there's a big difference between `datetime(2018, 10, 24, tzinfo=tz)` and
`tz.localize(datetime(2018, 10, 24))` which is what `make_aware` does. The
first will assign the timezone `Europe/Berlin` timezone
[https://en.wikipedia.org/wiki/Time_in_Germany#History as it was first
defined] and the latter will assign the timezone as it is defined on the
specified datetime.
In other words direct `tzinfo`, assignment will create highly likely bogus
datetime objects (unless a timezone definition such as UTC is used) while
`localize` will make sure the right timezone is used. In your case
`datetime(2018, 10, 24, tzinfo=euberlin)` creates a datetime for
2018-10-24 with the timezone definition of `Europe/Berlin` in 1901.
--
Ticket URL: <https://code.djangoproject.com/ticket/29884#comment:11>
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