De acordo com alguém que parece saber ...
There is no Group Policy can show additional clock directly. But you still have two options to achieve it below:
- Registry Group Policy Preference (GPP)
- Logon script Group Policy
For the detailed information, please refer to the following articles:
Add Additional Clock via Registry
Combine o primeiro e o segundo links para a abordagem GPP ou o terceiro e o quarto para o GPO com script.