Bug 423995

Since Plasma 5.19.3 (upgraded from 5.19.2) my clock and all other applications changed from the German time format to the US format.

Somehow Plasma does no longer respect my global / system wide settings of LANG/LC_ environment variables despite the fact, that I have selected "no change" and disabled the checkbox "detailed settings" in kcm_formats. 

This is traceable using the commands locale and env inside plasma and on some TTY:

INSIDE PLASMA
$ env | grep -e "LANG\|LC_"
LANGUAGE=
LC_MONETARY=en_US.utf8
LANG=en_US.utf8
LC_MEASUREMENT=en_US.utf8
LC_TIME=en_US.utf8
LC_COLLATE=C
LC_NUMERIC=en_US.utf8

$ locale
LANG=en_US.utf8
LC_CTYPE="en_US.utf8"
LC_NUMERIC=en_US.utf8
LC_TIME=en_US.utf8
LC_COLLATE=C
LC_MONETARY=en_US.utf8
LC_MESSAGES="en_US.utf8"
LC_PAPER="en_US.utf8"
LC_NAME="en_US.utf8"
LC_ADDRESS="en_US.utf8"
LC_TELEPHONE="en_US.utf8"
LC_MEASUREMENT=en_US.utf8
LC_IDENTIFICATION="en_US.utf8"
LC_ALL=


ON TTY
$ env | grep -e "LANG\|LC_"
LANG=en_US.utf8
LC_TIME=de_DE.utf8
LC_COLLATE=C

$ locale
LANG=en_US.utf8
LC_CTYPE="en_US.utf8"
LC_NUMERIC="en_US.utf8"
LC_TIME=de_DE.utf8
LC_COLLATE=C
LC_MONETARY="en_US.utf8"
LC_MESSAGES="en_US.utf8"
LC_PAPER="en_US.utf8"
LC_NAME="en_US.utf8"
LC_ADDRESS="en_US.utf8"
LC_TELEPHONE="en_US.utf8"
LC_MEASUREMENT="en_US.utf8"
LC_IDENTIFICATION="en_US.utf8"
LC_ALL=


I have tried to delete ~/.config/plasma-localerc, but this did not changed anything. The config was recreated using the following settings.

$ cat ~/.config/plasma-localerc 
[Formats]
LANG=en_US.utf8



Operating System: Gentoo Linux
KDE Plasma Version: 5.19.3
KDE Frameworks Version: 5.71.0
Qt Version: 5.15.0
Kernel Version: 5.7.7-gentoo
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-4790K CPU @ 4.00GHz
Memory: 23.5 GiB of RAM
Graphics Processor: GeForce GTX 970/PCIe/SSE2