Ubuntu – Changing first day of week using GUI in Unity

Here's another solution, also from Ubuntu Forums. I think this is somewhat cleaner and more robust: it doesn't involve customizing Ubuntu's locale files (only settings that you're supposed to edit).

Gnome calendar applet adheres to your locale settings. In Ubuntu, you can assign locale components by editing the file /etc/default/locale. Here is what I've got there:

LANG="en_US.UTF-8"
LC_TIME="en_GB.UTF-8"
LC_PAPER="en_GB.UTF-8"
LC_MEASUREMENT="en_GB.UTF-8"

Which means: I want software messages in American, but time, paper size and units in British i.e.weeks starting with Mondays, A4, metric.

Props to artm who posted that!

Of course, LC_TIME="en_GB.UTF-8" is the relevant setting to get weeks to start on Mondays.

You need to log out and back in for the change to take effect.

To adjust this, change or add the following lines in the LC_TIME section in /usr/share/i18n/locales/<your_locale>:

week            7;19971130;5
first_weekday   2
first_workday   2

And then update the system:

sudo locale-gen