to make a permanent, system-wide change of the TZ unfortunately requires to edit the file /etc/TIMEZONE and then a reboot. After rebooting the TZ setting will be changed everywhere.
The /etc/TIMEZONE file is a sym link to /etc/default/init (in the timezone man page this file is called /etc/timezone which is wrong). For the full list of possible timezones have a look in the /usr/share/lib/zoneinfo/ directory.
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