I have a Veloster Plus and my clock is also all over the place time wise.
6 months ago when I bought the vehicle they told me to set the time manually via the time zone in the sat nav.
Then go to your PC, download the Hyundai map update tool, plug in your thumb drive and it will check and download the latest map for you.
Then back to your car to complete the install process. The Navteq maps are not perfect though and seem to contain a lot of errors such as incorrect street names, speed limits etc but you can become a "Navteq Map Reporter" to log errors if you have the time and inclination. You spend good money on something that should be perfect from day one.
Suggest other Hyundai owners may wish to comment in the hope that strength in numbers may galvanize Hyundai into some form of action.
You insert in in your vehicle first so that it can determine what version is installed.They didn't even mention doing a firmware upgrade as I questioned why that wouldn't fix my issue.I have a new santa fe (2013 version, bought late 2012).. I have been waiting for this firmware update – is there somewhere we can download and install it ourselves, or is it a dealer only install?3.0 The screen often hangs after a phone call has ended and the map screen has to be manually selected.4.0 Allied to point 3 above, the clock fails to refresh and quite often shows the wrong time.