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.