A clock can be set to specific time zone or use the account default time zone. When its time zone is set to default, it synchronizes to the time zone set in the account profile. If a clock is assigned to a Location, it synchronizes its time to the time zone set in its assigned Location.
You can also set the time zone of multiple clocks at the same time.
Go to Devices > Clocks.
Select the Name link of the clock. Its profile is displayed.
Select Show Advanced Options.
From the Time Zone drop-down list, select a time zone. The time zone is displayed in the (parentheses).
Default indicates the clock is either set to the account time zone or its assigned Location time zone. If the time zone is set to default and the account or assigned Location time zone is updated, the system automatically updates the time zone of the clock.