Geographical timezones cover the Earth in such a way that two timezones never overlap; hence, they are non-overlapping. But is there a better (shorter, without negation) word for this?
"Unfortunately he's travelling, possibly to a non-overlapping timezone, so I'm not sure when he can take the call."
Distinct and discrete come to mind, but they miss the nuance of continuously covering a surface and would not work in the sentence above (although just plain old different would).