that can get confusing, especially with certain states (in the USA) not recognizing DST (which I just want to see go away... EST5EDT? Madness! EST5 plain and simple). I actually ran into a time conflict driving cross-country where our hotel was in one TZ, and the Steak & Shake we planned to eat at was in another. Fortunately, in our favor, but still...
I was the guy at the airport always asking "do you know what time zone we're in?" in the early 2000s during my consulting days.