Clemens: you are right, but 11:59:59 p.m as an absolute reference doesn't really exist, so 16th in the morning is the safest solution (the 15th of June has come and is gone in the entire world).
Firo: we will try to come up with even more interesting ideas from now on. I've got something on my mind, but I can't talk about it yet - JCL has to approve it first.