I just noticed that it's the same with the Downloads screen, TIME INITIATED is in 12-hr format.
I have this issue too, four years later.
Any Update? I have the same problem and are also interested, where steam client reads the information for the time formatting from. I also get am/pm format and want 24h format.
my locale output looks good:
$ locale
LANG=de_DE.UTF-8
LANGUAGE=
LC_CTYPE="de_DE.UTF-8"
LC_NUMERIC="de_DE.UTF-8"
LC_TIME="de_DE.UTF-8"
LC_COLLATE="de_DE.UTF-8"
LC_MONETARY="de_DE.UTF-8"
LC_MESSAGES="de_DE.UTF-8"
LC_PAPER="de_DE.UTF-8"
LC_NAME="de_DE.UTF-8"
LC_ADDRESS="de_DE.UTF-8"
LC_TELEPHONE="de_DE.UTF-8"
LC_MEASUREMENT="de_DE.UTF-8"
LC_IDENTIFICATION="de_DE.UTF-8"
LC_ALL=
$ date +'%X %x'
22:58:05 14.10.2019
I also modified steam start script (/usr/games/steam) and set the LC_TIME var (with export) like shown. But still the same problem.
It would be nice, to know the information where steam search for this time format.....
Nothing extracted yet.
I have chat timestamps on for client and overlay chats, as set in Settings\Friends. They are displayed in this weird format with AMs and PMs which those of us who use international scientific standards have a hard time deciphering. My locale (LC_TIME=C) is set to use a 24-hour format.