Add new date link (Add+): Pre-populate date field in new node

I´m not sure if this issue belongs to calendar or date or both or...

The "Add+" in the calendar view opens a new date form as supposed.
But as the link from which the "Add+" link was hit is containing the date itself (.../node/add/termin?destination=calendar-datum/2009-03-13) i expected it to prepopulate the datefield in the new node, which it doesn´t do.
It´s rather todays date, and when i change it in the datefield setting to empty, its simply emtpy.

So,
1. am i right, that it´s supposed to prepopulate the news nodes datefield?
2. might it be that it doesn´t work, cause i changed date settings to my german timeformats?
3. can i and how can i tweak things, so my new datefields get prepoulted with the date it was triggered from?

I generated everything through the date wizard in two different setups, and in both it doesn´t work as expected.

Cheers
bernd