Sep 4, 2011 - 12:59 PM
Hello wajid,
A Swiss rail pass allows you to finish your trip that night, even after 12 PM. You may continue traveling until 5 AM on the day following the travel day. So if you'd like to start traveling on September 4, 11 PM, you would validate your pass for September 4, and you can keep traveling until 5 AM on September 5.