Notice that Iran, and Afghanistan, which straddle meridians, have split the difference and are different from everyone else by half an hour. (Figures)
Something weird about Fiji, too. It seems they flip the calendar for the International Date Line before the clock strikes twelve. That has to raise an eyebrow or two.
The Flying Castle uses white and purple. (0, -8, and +8)
The International Date Line for the Flying Castle is, “Hi! Are you with the U.N. delegation?”
I don't think Fiji crosses the dateline but there are two places that do just what you noted: some island owned by NZ, and (I think) Anadyr, Russia.