I have access to two Balance 20xs running fw 8.2.1.
The first one has no AP and the Event log in the AP tab and the STATUS tab are using the same time zone.
The second one has a single Ethernet connected AP that is managed via the controller feature. Here, the two event logs are using different time zones.
DETAILS IN THE AP
System tab → time is set to America/LosAngeles
Status tab → device shows the time is PST (US West Coast)
The event log shown in the AP is using US west coast time.
DETAILS IN THE ROUTER
System tab → time is set to US West Coast time (GMT-08:00 Pacific Time US & Canada)
Status tab → devices shows it is using US west coast as time is PST
Status tab → event log is using US west coast time.
But …
AP tab → Event log is using US East coast time