When you wake up the computer, openSuse shows a black screen with a box to input your password.
Above the box there is the following time/date (today/now as an example):
12:42
2024 M02 19, Mon
In the regional settings the Time is set to:
Monday, 19 February 2024 12:42 EET
19/02/2024 12:42
yet the screen saver remains on the odd format in the 1st box above. How can I fix it?
I’m guessing that you’re not using Gnome?
It’s working fine for me on Gnome/Wayland.
How did you change the time and date settings, using Yast or some other way?
Perhaps set it from Yast, it’s magic 
Then try your DE’s settings.
My apologies for not mentioning what I was using.
I am on Tumbleweed KDE.
Like I said, I changed the time format in regional settings in the Settings part of openSuse. So, I did not do it in Yast.
I looked at Yast Date/Time, which is the window I got during the installation of openSuse. Anyway, it does not give any special options, and the date and time are correct there:
By DE’s settings I assume you mean the general settings:
It appears you have changed the desktop environment (KDE) settings which is what controls the lock screen configuration normally. 
Yast probably won’t be involved in this process.
Hopefully someone with a KDE installation can help you out, I don’t have access to one at the moment!
OK, thanks for your input.
Note Linux is multi user and thus every user can have their own time. In addition the system can have its time.
To clarify a couple of things. First of all, the “general settings” you are referring to are not “general”, or a settings part of openSuse … it’s the System Settings component of the KDE desktop. It’s not a GNOME or XFCE component, it’s written by and for the KDE desktop. (you can open System Settings app, click its Help->About and see that it is a KDE component 
)
The second clarification is about the “log in screen”. The default is SDDM (Simple Desktop Display Manager). It’s a cross-desktop X11 and Wayland display manager, based on QT, so is not specific to any Linux variant or desktop environment.
.
Okay, back to the question about the format. You called it an “odd format”
12:42
2024 M02 19, Mon
So, the first line is the time, which seems correct (compared to your second example). The second line would be:
2024 = year, M02 = “Monday” + month 2 (Feb), 19 = day of month
.
So my question is, what is the issue? The “M” with 02? (or maybe I don’t understand the EET date-time format)
Does SDDM have a lock screen or is it KDE’s own? 
This old github issue seems to imply they wouldn’t want to implement it.
Thank you for the explanation.
The issue is that I want the date shown as 2024-02-19, Monday.
For anybody else interested in this, I found this solution.
However, the only drawback you need to be aware of is that updates can revert the manual changes, if I am not mistaken.
Is there anybody who knows how to make the changes permanent?
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