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

[Paul Eggert]

On 01/26/2018 11:32 AM, Yoshito Umaoka wrote:
> If "Irish Standard Time" is the official term, also recognized by 
> people in
> Ireland, specifying time in summer there, CLDR should not change it 
> just for
> this purpose.

If the CLDR insists on not changing that string, we can accommodate the 
transition in a more-complicated way, by adding a zone 
Europe/Dublin-ndst which is like Europe/Dublin except that it uses 
negative DST offsets. For forward compatibility we also add a zone 
Europe/Dublin-pdst that is like Europe/Dublin except that it uses only 
positive DST offsets; this will be helpful when tzdb's Europe/Dublin 
switches to negative DST offsets. Something like the attached patch to 
CLDR should do the trick. The idea is that this patch should not cause 
any incompatibilities with existing usage, because it doesn't change any 
existing data; it only adds new data intended to be useful during the 
transition.

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