>>If I recall correctly, Indiana (the parts in the Eastern Time Zone) stays on Eastern Standard Time. Some of it is Central Time.
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>I'm not entirely sure, but I thought the entire state was technically supposed to be in the eastern zone. The problem, I think, is that the western part of the state is so far west in the eastern time zone that it's effectively central time, that is, running on eastern time in EDT, for example, would give very late dark mornings even in summer. Thus some localities opted out of the state standard...

I'm originally from right next door (Chicago) and last year we were driving back from there and stopped somewhere in Central (or Southern) Indiana. That's when I first learned about them always being on Eastern Standard. According to the time set dialog, Eastern Indiana is Eastern Time, but it doesn't show Western Indiana. Despite all the trips I've made to the NW corner of the state, I don't remember there being a difference in time. Maybe I just never paid attention.:-)