[tz] OpenJDK/CLDR/ICU/Joda issues with Ireland change

[Paul Eggert]

On 01/25/2018 06:28 AM, Yoshito Umaoka wrote:
> If CLDR project really wants to handle the distinction between "Irish 
> Summer Time"
> and "Irish Standard Time", it's doable.
>
> However, CLDR technical committee does not want to take an effort to 
> localize
> zone names never used in last 30 years for hundreds of locales.

I can understand that. However, it does make sense for the CLDR 
committee to fix the problem for Irish time now, even if it doesn't fix 
similar problems in the other hundreds of locales. Partly this is 
because the issue has come up for Ireland when combining CLDR with tzdb. 
But more importantly, if the issue is coming up for Ireland's past now, 
then it's quite plausible that it will come up for some other country in 
the not-too-distant future when they change their rules. It would be 
better to have some practical experience with such situations as opposed 
to armchair theorizing, and one way to do that would be to add support 
for historical Irish time now, and to make sure that this support works 
when combined with tzdb.