id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
25845	False timezone offset warnings in admin if a custom base template doesn't set data-admin-utc-offset	Sven Grunewaldt	Sven Grunewaldt	"Django 1.9 introduced a new data attribute on the body tag in the Django admin base template:
https://github.com/django/django/commit/8eeb566aca33600d272dee5fba59c3445b5b8163

This attribute is read in JavaScript with getAttribute() and checked on !== undefined to determine if it is set:
https://github.com/django/django/commit/8eeb566aca33600d272dee5fba59c3445b5b8163#diff-cb2d960617da7bad9ba5ed3366931159R22

This worked with the previous code, but getAttribute() returns null or """", which never equals undefined. Because of this the following code will run, calculating false offsets between browser time and server time, causing false warnings to appear in the admin date widgets.

More info on getAttribute():
https://developer.mozilla.org/de/docs/Web/API/Element/getAttribute#Notes

I noticed this after upgrading to Django 1.9 while using django-suit, which is missing the attribute on body at the moment:
https://github.com/darklow/django-suit/issues/449"	Bug	closed	contrib.admin	1.9	Normal	fixed			Accepted	0	0	0	0	0	0