HTML5 RDP can also redirect the local time-zone to the remote server. The remote server should enable this feature.
To enable time-zone redirection in Windows 2008 R2
Use the following path:
Computer Configuration > (Policies) > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Device and Resource Redirection > Allow time zone redirection.
Click OK.
After enable the setting on the remote server, you can see the local time-zone is redirected to the remote server.