Changing the lock screen clock theme

Support KDE Plasma
2

you can change /usr/share/sddm/themes/(theme_name)/components/Clock.qml or /usr/share/sddm/themes/(theme_name)/Clock.qml depending on where it is.

for example, /Clock.qml >>> Qt.formatTime:

text: Qt.formatTime(timeSource.data["Local"]["DateTime"])

change it to:

text: Qt.formatTime(timeSource.data["Local"]["DateTime"], "H:mm:ss")

save and reboot

then you will have a 24-hour clock which also display seconds