GMT-3 Timezone problem

GMT-3 Timezone problem

Hi all,
We'v been testing SDP for the last weeks and everything have worked fine so far, until now.
The problem is, there is no (GMT-3) Timezone.
Neither on Requester Personalization Options nor on Tech/admins Site/Region Settings.
So, my question is, since we'r in Brazil, and willing to use SDP in our own environment as so in customer's, we rly need this to be fixed otherwise we cannot use SDP.
Iv been browsing this forum for the last weeks but couldnt find any post regarding this particular issue.
Can anyone help in here??

*note* attached jpg shows the error in personalization settings.







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