datetime

I installed gwolle guestbook.
I´ve imported data from a old ASP Guestbook with a csv file in phpmyadmin.
That worked fine.
The only problem is the datetime format.
My format is 30.07.2005 which is July th 2005.
What format is in gwolle? How can i change that?

https://ww.wp.xz.cn/plugins/gwolle-gb/