The “7:00 PM rule” applies to any train that leaves after 7:00 PM and arrives after midnight. So it could apply to a train that left at 23:30 and arrived at 0:10.  The only issue is that there can’t be any connections (stops or trains that split are not a problem) before midnight, so you can’t take a train that leaves Saltzburg at 19:00 and make a connection to a different train in Munich at 21:30 and arrives in Berlin the next morning and just count one day.  The other issue is that you must use arrival day as the day you count.  If’ you took another train somewhere on departure day then you would have already used a box for that day on your railpass.  

Thanks. That helps some. Though how can I be sure that I don’t have any connections in my trips. I used railsaver and typed in my itinerary, checked the overnight box, and they said the 4 country, 5 day pass was the right one for me. 
 
Itinerary:
 
Amsterdam to Copenhagen
Copenhagen to Berlin
Berlin to Paris
Paris to Amsterdam
 
So is there a way of telling if your trip has a connection versus a stop or car splits? Thanks.
 
I was gonna get night trains for each leg.

Use http://reiseauskunft… to look up the actual train schedules.  It will show how many connections are involved.  There are several overnight trains on each of these routes and there’s usually at least one overnight train between major cities that has no connections at all.  If you can’t find a train with “0” connections, click on the specific train to see the time for the connection.  If it’s after 0:00, then it’s no problem.  

Ok. Thanks. Now I understand the way it works. Now I just have to snag trips that arrive after midnight. I think I’ll have to do some p2p ones.
 
Thanks again.