[Evolution] Setting date/time format in evo?

[Svante R Signell <srs kth se>]

I need som help in where to set the date/time format in the preview pane
of evo. Looks like I already have changed the time setting to 24 hour
format, but want to change the date format too (month-day-year is very
confusing for us Europeans). I did not find anything in the Preferences
settings (except in the Contacts menu). Is it on gnome settings level?

Thanks
Svante