Solved

Server time

Quite possibly, perhaps the game is not correctly recognising your timezone DST settings. Can you show me a screenshot of an incorrect time? It will let me know which area of the code to look at.

Gustavo, I am looking into this now and it is a complicated one. The game is supposed to detect whether you are observing DST from your computer or device. What timezone is the device set to?

I notice also that the language elements are incorrect for the timezone though, so that needs correcting. That also is not a quick job, but I will figure it out.

An update: I looked into this in more detail and concluded that we're both a bit confused. Microsoft Windows shows London as GMT+0 on its timezone list also right now, even though London is GMT+1 due to BST. It seems even though it is confusing, the way we've done this is the same way Microsoft handle it on Windows. This might explain why only me and you seem to be confused about it. :D

Regarding your issue, is DST observed in Brazil? Google says yes, so that explains why you are seeing times 1 hour behind where you think they should be on the select list. Check in Windows though, that's the same for me. I thought London might be showing as GMT+1 when I checked, but they show it as GMT+0 as I said.

Yes, it gets the DST preference from your system clock (using some clever JavaScript in the web browser, not anything on the system), so that makes sense.

But the question then is, why does it think you are observing DST now if it's not until October? What timezone are you set to?