I see. So I just right clicked on the time, then on “Properties” and selected a value for the Timezone. It changed the clock display, but typing “date” in a terminal still shows UTC.
I tried tzselect, it didn’t change the time zone either.
Then tried sudo dpkg-reconfigure tzdata
That did change the timezone and added /etc/timezone and /etc/localtime files
The clock wasn’t affected though. I changed the timezone there to anything, closed it, then emptied the timezone field to the way it originally was, to force it to update, and it did take the new timezone.
Did you manage to get it working? I experienced the same thing. Time starts according to the configured timezone, then changes about a minute later to UTC.