I tried to set the timezone of the "Digital Clock" widget of the default panel.
I access the configuration panel using "right click > Digital Clock settings... > Time zones", set "Paris" the only city selected, saved and reboot but the time does not adjust.
This parameter seems to be used by the desktop as the time displayed on the lock screen is correct. For example, if the correct time is 14:00, the widget will show 12:00 - the lock screen shows 14:00.
There is no port with this name. Can you please clarify?
Assign to the right maintainer.
Tobias, do you know if this is still a valid bug?
(In reply to Raphael Kubo da Costa from comment #2)
First of all sorry, I totally missed this bug report.
I tested it here, and right-clicking on the digital-clock in the panel and selecting "Digital Clock Settings" and choosing your wanted time zone(s) in the "Timezones"-tab should work now (plasma 5.5.4). I think that was an upstream issue.
But I will have to check whether it picks up the correct local time zone by default too.
I've had the same problem and I think it depends on whether /etc/localtime is a symlink to /usr/share/zoneinfo/Europe/Paris or a regular file.
Mine is a symlink and everything works fine.
Yes Mikael is right, looking at qt's code  it is indeed necessary that /etc/localtime  is a symlink to a timezone file for Qt to determine it.
This isn't really correct as the default behavior of FreeBSD is to use 'cp' for /etc/localtime instead of a symlink. Qt should instead learn about /var/db/zoneinfo. In that blob of Qt code from the URL, it already checks for '/etc/timezone' on Debian, the same check would work if it also checked for /var/db/zoneinfo on FreeBSD.
A commit references this bug:
Date: Wed Jun 13 17:02:32 UTC 2018
New revision: 472335
Recognize timezones on FreeBSD for the default install.
By default, FreeBSD copies the current timezone database to
/etc/localtime and stores the name of the symlink in /var/db/zoneinfo.
Qt expects /etc/localtime to be a symlink and uses the symlink's
target to infer the name of the default timezone. The existing code
in Qt includes some workarounds for Linux distributions that also copy
the current timezone to /etc/localtime by checking for files that
contain the name of the timezone. Add a similar check for
/var/db/zoneinfo on FreeBSD.
Reviewed by: tcberner
Differential Revision: https://reviews.freebsd.org/D15792