#20663: Admin Now and Today buttons use confusing time / timezone
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Reporter: imfletcher | Owner: aaugustin
Type: Bug | Status: assigned
Component: contrib.admin | Version: 1.5
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 1
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 1 | UI/UX: 0
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Comment (by loic84):
Since there have been a lot of previous discussion on the topic, I'm gonna
explain in detail the reasoning behind this patch.
As Aymeric describes in [comment:7], the issue at hand is "browser time
zone" vs. "current time zone".
- "browser time zone" is usually the time zone on the user's computer,
it's a time zone we basically know nothing about on the backend.
- "current time zone" is the time zone on the backend for the current
request, which by default comes from `settings.TIME_ZONE` unless
manipulated by `timezone.activate()` (i.e. in a middleware).
For whatever value we find in the date/time input field, the backend will
assume it's given to him in the "current time zone", which again, is the
only time zone it knows about.
When both "browser time zone" and "current time zone" are the same, all is
well since there is no ambiguity.
However when those two differ, as things are now, you start having issues.
For example, if your field controls the publishing of an article
(`pub_date`), you get the weird behavior where you ask to publish
something **now** and nothing happens, because "now" for you is not the
same as "now" for the backend.
The only way to get it right is to remove all ambiguity introduced by
naive `datetime`. My patch fixes this ambiguity by making sure that both
the backend and the JavaScript agree to talk in the "current time zone".
A more ambitious solution to those naive `datetime` would be to have a new
`SelectDateWidget` with an additional dropdown menu for the time zone and
maybe explicit shortcuts like: "now (backend)" and "now (local)".
I hope that helps.
--
Ticket URL: <https://code.djangoproject.com/ticket/20663#comment:12>
Django <https://code.djangoproject.com/>
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