I run BS on Windows 7, 2000 and XP and time switches back on all of them.

Perhaps it takes a little longer to switch back on some systems?
I just read back a multi-month old Private Message to someone else and noticed I had said "On my XP, date changes back to today's date after connecting to the first peer."
But my Windows runs a little slower than most people.

I've timed it on my Windows 7 and takes 30 seconds for the clock to change back to normal.