The 'Device Summary' area contains detailed technical information about a device, including the local time zone.
Login to C1 > Click ‘Applications’ > ‘IT and Security Manager’
Click ‘Devices’ > ‘Device List’
Click on the name of the device whose time you want to check. This will open its details page.
Click the ‘Summary’ tab
Local time zone is shown in the ‘Device Summary’ pane: