Differences of date and month outputs in agenda and Posterboard views

Hi,
I use Estonian language with WordPress.

So, in Agenda view: juuli 10 @ 21:00 – aug 9 @ 0:00
and in Posterboard: 10.7.2013 @ 21:00 – 10.8.2013 @ 0:00
I want to use calendar as it is in Posterboard.

How can I change the Agenda view the same as in the Posterboard view?

B, Kai

http://wordpress.org/extend/plugins/all-in-one-event-calendar/