I go to Applications -> Preferences -> TimeZone Configuration
I select Europe/Bucharest and press OK
The timezone is correctly changed in /etc/TZ, however the clock is set 3h into the future. This shows that Slitaz considers the hardware clock to be always set to UTC, which is not the case.
How does Slitaz manage this? On other Linux systems this information is stored in /etc/sysconfig/clock, but there's no such thing on Slitaz.