@AntonioPlais You can check your account settings after logging in at www.gotomeeting.com, then clicking your personal avatar image in the upper right (if not already selected), and finally clicking Personal Info.
The goal of testing different time zones is to narrow down the problem to your PC, the GoToMeeting plugin, or the system itself.
Problem plugins reported by customers in the past (as referenced on this thread) include CompanionLink.
@AntonioPlais I am trying to recreate the image that you showed, but am not finding in Google Calendar an option for Horario Universal time (GMT +0). Have you tested some other zones that are also GMT +0?
You can also call directly into our support group for hands on assistance: https://support.logmeininc.com/gotomeeting/contactus
try to change the language settings of google and goto, switch to English and back to Portuguese, this bug has something to do with languages.