When I enter the game, the time is wrong, how do I fix it and leave my country's time?

https://github.com/0xWhyd/gmtime
Looks like this could help you.
I'm also forwarding this to the team. Maybe they will have easier solution.

Workaround:
In server control panel, settings tab, append startup value with

export TZ='America/Sao_Paulo'; 

Example Before:

./samp03svr

Example After:

export TZ='America/Sao_Paulo'; ./samp03svr