A while back I showed how to change the week start day in the Hamster Applet time tracker. Today I'm going to show how to change the week start day to Monday for Ubuntu in general. This will affect various applications in Ubuntu including the default clock applet on the panel. I figured some of this out by reading this post on the Ubuntu forums.
The time and date formats in Ubuntu are controlled by the locale settings. First you need to find out the current locale being used to control your time and date settings. Open a terminal and enter the following command.
You should see a result that looks something like
which in my case is English US.
Now you're ready to make your adjustments. Change to the locale directory and copy the current locale file to create a new custom file.
sudo cp en_US en_US_custom
Adjust the above copy command for your locale that you found in the previous step.
Now edit the new custom file.
Find the line that says
and change it to
then save the file and close the editor.
The final step is to make the change in /etc/environment to point to your new custom file.
Add a line like this to the bottom of the file making sure to adjust it for the custom locale file you want to use.
That's it. Log out and log back in and you should see the change in the panel calendar and other applications such as Evolution.