I am not channeling Joseph, I am just stating there is a debate when Shabbos is for certain places. I have a relative who went to Hawaii and wound up observing 2 days of Shabbos and when they went to Alaska, they avoided the issue by not spending Friday-Sunday there. They are Charedim.
During the Second World War the Group that went to Japan and Shanghai observed 2 days of Shabbos because of a doubt when Shabbos was