OS: Zorin 16 Pro
My current date & time format is in United States. I know I can change it to other locale. But what I want is ISO 8601 format and in English. Is there an option for that Zorin?
Currently it's Tue Nov 30 09:56:25. What I want is something like 2021-11-30 T 09:56:25
Any thoughts?
You may also be able to adjust it in gnome-tweaks... but I'm not sure.
Not possible. Unless you know where the config files are. Maybe then I can change its value display on the Top Bar.
Elevate your file manager to root.
Navigate to and edit the file:
/usr/share/i18n/locales/en_US
Scroll down to date_fmt (probably around line 121)
Change it to date_fmt "%Y-%m-%d %H:%M:%S"
Save the file and exit.
Generate your locale:
sudo localedef -f UTF-8 -i my_en_US MY_en.UTF-8
Add environment vairable:
sudo localectl set-locale LC_TIME=MY_en.UTF-8
Reboot and test.
Thars a gnome in muh boot.
Elevate your file manager to root.
Navigate to and edit the file:
/usr/share/i18n/locales/en_US
Scroll down to date_fmt (probably around line 121)
Change it to date_fmt "%Y-%m-%d %H:%M:%S"
Save the file and exit.
Everything went alright with the instructions above.
Generate your locale:
sudo localedef -f UTF-8 -i my_en_US MY_en.UTF-8
Here it says cannot be found. my_en_US
then I did the next command sudo localectl set-locale LC_TIME=MY_en.UTF-8
Reboot and it's still Tue Nov 30 12:51:37.
What went wrong?
Me forgetting to post:
sudo cp en_US my_en_US
It's no biggie though, you can adapt with:
sudo localedef -f UTF-8 -i en_US en.UTF-8
sudo localectl set-locale LC_TIME=en.UTF-8
If that says file not found:
cd /usr/share/i18n/locales
Then run the above...
I did all of the above and reboot.
It is still Tue Nov 30 13:10:33
Here is the region and date and time settings.
You can try:
Add
export LC_TIME="en_US"
to ~.profile
Im kind of stumped. That really should have worked...
I tried adding that line into .profile.
reboot
and then it gave a black screen with error cannot find the LC_Time thing and that I should fix the .profile immediately. I tried opening Terminal and it did not open. So I opened the .profile and removed that line you told me to add.
So I am back to square 1.
Well, my mind is now blown.
See Harvey? False confidence...
(I will do some searching and look into it...)
Are we looking at something like this?
export LC_TIME="en_US.UTF-8"
perhaps?
I think yuuki will be nervous.
Read some info from the internet - this can be done with an extensions called "Panel date time format" but sadly it's not available for the version 3.38.4.
The one from github is for version Gnome 40
I tried export LC_TIME="en_US.UTF-8"
No error but the time is still Tue Nov 30 16:17:57
So this won't work for us on Gnome 3.38.4 
In dconf-editor, there is a setting
/com/canonical/indicator/datetime/time-format
gsettings set com.canonical.indicator.datetime time-format 'custom'
gsettings set com.canonical.indicator.datetime custom-time-format '%Y-%m-%d %H:%M:%S'
https://linuxize.com/post/how-to-set-or-change-timezone-in-linux/ Did you reading that?
I don't have the "indicator" subfolder under "canonical" in my Zorin 16. There is only a "unity" subfolder:
Nevertheless, there is a gnome-shell extension to customize the date time format called "Clock Override" where you can create a custom string.
I have it and I am also on Zorin OS 16.
I checked again using terminal. This is all the schemas containing the string "com.canonical" on my Zorin 16 Core system:
topaz@Sydney:~$ gsettings list-schemas | grep com.canonical
com.canonical.Unity.Lenses
I wonder what would account for this difference from yours? 
