Automatic detection of timezone in django admin using javascript

[ldeluigi]

Given ​https://stackoverflow.com/questions/1091372/getting-the-clients-time-zone-and-offset-in-javascript
it seems that you can get the client timezone using javascript for almost all browsers.

This could be used to set a session/cookie with the aforementioned timezone in order to communicate it to a timezone middleware, that runs activate().

Both the middleware and the javascript script could be provided by default by contrib.admin.

The benefit is that by default/for free django-admin would provide its users with properly localized datetimes instead of UTC

[Mariusz Felisiak]

The Django admin uses getTimezoneOffset() since 7e6d852bac4de2d5ed2d5ddeabf71482d644ef51. I think you're talking about timezone-aware widgets 🤔, so it's a duplicate of #29822.