I would like to customize the date/time format on my panel. From what I read, that was possible up to 16.04.
Is there a way to do it on 18.04?
I would like it to display it as mon feb 25, 2019 10:30 pm
If there is not, is there configurable app that will show date and time on the desktop?
Thanks.
I'm on 18.10 and the same solution in this thread is working for me.
When I tried it, it said
No schema available. A schema is what ....and Dconf Editor can not find one.
It still works without the schema. (I think a schema somehow describes what kind of settings values the app should expect, but it's apparently not required to save settings.) I use a vertical panel and have to use a custom format for the date and time to fit, so I'd definitely notice 
It did not work for me.
What kind of error? Can you post a screenshot?
I entered the format and exited Dconf-editor.
I rebooted and time/date format was unchanged.
Did you change the format entry to 'custom' (as shown in my first screenshot?
Try these two commands. If they work, I can explain, if anyone is interested.
dconf write /org/mate/panel/objects/clock/prefs/custom-format "'%a %b %d, %I:%m %P'"
dconf write /org/mate/panel/objects/clock/prefs/format "'custom'"
It worked. 
Thanks.
%a %b %d %Y, %I:%p
The %Y is supposed to show the century, but it does not?
I do not know what to say.
So your panel shows the century?
