zahavasdad- That may be due to the machlokes between R’ Tikuchinsky and the Chazon Ish on the International Date Line.
You may want to read this article.. http://www.theyeshivaworld.com/news/General+News/113307/How-to-Keep-This-Shabbos-in-Samoa%3F-STAR-K-Tells-Us-How-%28Samoa-%26-Tokelau-To-Cross-International-Date-Line%29.html