Each year, Eid al-Adha (like other Islamic holidays) falls on one of about 2–4 different Gregorian dates in different parts of the world, because the boundary of crescent visibility is different from the International Date Line.
The halachic ruling of Rabbi Moshe Heinemann, Rabbinic Administrator of the Star-K, is as follows: In New Zealand and Japan, the local Saturday is according to majority opinion Shabbat, and it should therefore be fully observed as Shabbat, with Shabbat prayers, etc.
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2006 Pacific typhoon season in the north Pacific Ocean, west of the International Date Line