I've never noticed, but like some others, have never crossed a time zone with my Wing yet. My wife's car has almost the exact same program and it automatically updates for MDT and MST so the zones sure should. Looks like I need a longer road trip to find out
Additionally, I select many destinations in Google Earth. By hovering with the arrow over a certain area I get my coordinates which I then select it as a destination on my small Garmin. Cannot do that on Goldwing GPS since does not have a coordinates input.