As you can define several identities for the Tenant Update Time Window.
Nevertheless you will not find a dedicated Time Zone switch.
New-CsTenantUpdateTimeWindow -Identity AlwaysOn -Daily -StartTime 0:00 -Duration 24:00
The TIME ZONE (e.g. GMT, UTC, ..) applies on CsPSTNHybridSite physical location, where the CCE is located and the Time Zone is tight on the local Hyper-V (CCE Appliance).
The process for planning the time window across multiple location is simple:
- define all necessary TenantUpdateTimeWindows, including StartTime and max. Duration
- define all physical location
- set the CCE Hyper-V Host to the physical location time zone and with the correct time
- make sure the VM's will get there time fro the physical host (CCE)