LC_TIME set incorrectly

[Nils <tuxifan@posteo.de>]

Hi everyone,

I am helping a friend fix this system, and he is having a weird issue causing 
his LC_TIME to be en_DE.UTF-8.

I have already added a line to the config file attempting to override this:

riccy@riccy:~$ cat /etc/default/locale
#  File generated by update-locale
LANG=en_US.UTF-8
LC_TIME=de_DE.UTF-8

(after a reboot)
riccy@riccy:~$ echo $LC_TIME
en_DE.UTF-8

Searching /etc for the config string reveals nothing:
riccy@riccy:~$ sudo grep -r en_DE /etc
riccy@riccy:~$ 

Any ideas what could be going on here? This is a Debian Bookworm install.

Thank you
Nils