Try times between Rio (Brasil) and Eastern US... depending on the date there are 4 different possible offsets...
On Thu, 2016-12-29 at 21:47 -0800, Scott Weeks wrote: :: and minimal time zones (still 5 hours :: between New York and Hawaii though). Apologies, I can't resist. :) Sometimes it's 6 hours and some times it's 5 between Hawaii and the East Coast. Hawaii is *always* -10 GMT. We don't do daylight savings time. scott