I'm sure there's no problem that can't be created by a sufficiently bad PM. I think you can treat the name of the city as the name of the timezone. Seems like

I'm sure there's no problem that can't be created by a sufficiently bad PM. I think you can treat the name of the city as the name of the timezone. Seems like you'd have the same problem either way. If you used "Mountain Time" and then your city switches to "New Mountain Time" you still have the incorrect timezone. Instead of cities it could use polygons on the surface of the earth, but that's starting to get complicated at that point.