change beginning of week to Sunday

[Jeff C]

Hello,
Is it possible to change the small monthly calendar to have the first
day of the week to Sunday, and not Monday?

When I right click on my clock and select "Adjust Date & Time".  The first
day of the week on my displayed calendar is Monday. (This is also seen
when I left-click on the clock. "tasks" frame and "calendar" frame pop
up.)

Just to let you know, i thought this "Monday is 1st day" setting was
global on my ubuntu. but i checked other programs (e.g Evolution). Evo
has Sunday as 1st day.

If you know how to change calendar to have 1st day of the week as
Sunday, please let me know.

Thank you very much.