Time-zone database issues

[Martin Buchholz]

Aligning the openjdk API with the tzdb format is a good thing to do long
term.

However, updating old jdk versions is sufficiently difficult (and some
people will want to keep jdk6 and jdk9 tzdata up to date for years) that
I'm already resigned to using rearguard format "forever". It's a simple
strategy that works well, even if we eventually need to make additional
modifications to the rearguarding script.

Maybe I should care more deeply about getting the exact hour of a timezone
transition in 1951 right?!