OK, because of the question about most eastern point, I had to go look at a map. The international Date line is pretty straight forward for most of it's length ...
A bit of a diagonal jog up by the Bering Strait ...
BUT in the south pacific, things get really strange ...
I understand the jog to get Fiji and Somoa all in the same time zone (and this case all the same DAY!!) ...
BUT there is a really odd "hammerhead" shape going out to capture, I assume, so small islands? What is out there?