Howto Set Gnome Calendar First Day of Week in Ubuntu

This tutorial will explain how to change the gnome calendar first day of the week to Monday.

Check which locale you are using (mine is en_US, don't worry about the .UTF ending)

locale

Next, backup and edit the applicable locale file (use the result of the previous command if not en_US).

sudo cp /usr/share/i18n/locales/en_US /usr/share/i18n/locales/en_US.bak

gksudo gedit /usr/share/i18n/locales/en_US

Locate the following line and change the value. The value for Monday in en_US was 2. Select the appropriate number if you desire another day to be the start day.

first_weekday 2

Save the file and then

Update the locales

sudo locale-gen

Refresh the desktop

killall gnome-panel

The first day should now be Monday