Time zone support in iCal. I assume that's what changes my appointments by an hour when I go to a time zone an hour away from where I was when I set the appointment. But I can't find where it says how to use it or turn it off. There's the option in the iCal preferences to check the box to turn on time zone support, but I don't have that checked right now. However, my appointments are off by an hour because I'm in Memphis instead of NY.