I'd say it's a bug. My time is set to automatic, and it changed my time from what it was, to something it shouldn't be. If this would have been a work day, I'd have been an hour late.
Just now I did turn off the automatic and the time zone displayed was correct and both devices then automatically updated my time back to the correct time. Then I switched it back to automatic and the time stayed correct. We'll see if it sticks.
I just hope this doesn't happen every DST switch as I normally don't keep track since we don't observe it here. I've just been aware it was today due to others posting about their alarm issues.