Thank-you for the welcome!
I've become quite interested in this situation in Samoa over the last few months.
The problem all started just over 100 years ago with the Tonga islands.
Prior to 1884 the Islands simply accepted the week which was brought to them by the missionaries.
Since all the first missionaries (Methodists and London Missionary Society) arrived by traveling via Australia, they were all in line with Australia as to what day it was.
When the first adventist visitors arrived they of course were on the American (tail end of each day) and they thought everyone on the Islands were keeping the right day but calling it "sunday". BUT NO -- those Methodist and London Missionary Society and Catholic missionaries were NOT keeping the "right" Sabbath. They were keeping Sunday!
The confusion mounted as it was in October of 1884 that Greenwich England was declared the "Prime Meridian" by an International conference in Washington DC, even though no official 180th meridian dateline was established. Yet, a quick calculation showed that the 180th longitude is half way around the world from Greenwich England. So pressure was on to make it the dateline.
In 1892 Samoa accepted the American pressure and moved into the western hemisphere. (The first Adventist Missionaries arrived shortly after that).
Tonga however, resisted, they refused to change and remained in the eastern hemisphere. Now we can excuse the early Adventists (though I still think it was a big mistake) who probably thought Tonga would change just as Samoa had done, so they worshipped on Sunday -- thinking it would soon be acknowledged as Saturday.
But Tonga decided to stay right where they were -- in line with New Zealand and Australia. At that point (in my opinion) Adventists should have realized their mistake.
But now Tonga is taken as a precedent as if the 180th were a divinely ordained creation event. it's not! It's a man made estimate -- and nothing more. But since then as Island governments realize they really belong with the Australia/New Zealand group, and have changed back to being the "start of each new day" rather than the "tail of each day", Adventist leadership in these areas have instituted SUNDAY WORSHIP!
An interesting article shows the General Conference has NEVER endorsed Sunday worship in these Islands.
No Endorsement Given To Samoa Church for Sunday Worship