noosfero | Fix DB timezones and detect user timezone (#430)

[Bráulio Bhavamitra]

New comment for Merge Request 430

https://gitlab.com/noosfero/noosfero/merge_requests/430#note_786546


Bráulio Bhavamitra

@terceiro, rethinked this. Caching should be invalided for each different timezone. So I think this is fine. A page may vary in with each timezone. May the `Vary` maybe be used just as it is used with languages.

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