MeetingRoomApp uses the date, time, and time zone reported by the tablet's OS. It does not keep its own time zone database.
Why the time can be one hour off
Time zone definitions are not permanent. Governments can change local time regulations at any time, for example by:
creating a new time zone,
changing a UTC offset,
introducing or abolishing daylight saving time (DST).
Android takes these definitions from the IANA Time Zone Database. A tablet keeps a local copy of the database. When the local copy is out of date, the tablet keeps using the old definition until the copy is updated, so the device and MeetingRoomApp both show time that is inconsistent with their actual time zone.
How the update is delivered depends on the Android version:
Android 10 and later — time zone data is delivered by the Time Zone Data module, an APEX module. It is updated independently of the operating system through Google Play system updates.
Android 9 and earlier — time zone data is part of the operating system. The definitions can only be updated by installing a full system update.
Update the time zone definitions
Open Settings.
Go to About tablet.
Tap Software information.
Tap Google Play system update.
Tap Check for update.
Install the available update.
Restart the tablet.
