Hi,
same problem here (also Germany).
All day events are correct but birthday entries generated from my Contacts are appearing at the right date and also one day after that date.
If i go to change entries i see that start date/time is f.e. 2016-07-11 0:00 and end date/time is 2016-07-12 0:00
I also hope there will be a quick fix.
thanks
Markus