Previously Samoa was one of the last nations to celebrate the New Year and now they’ll be amongst the first. But this isn’t the reason for the change. The reorganization is a purely practical one as they’ll now be in line with Australia and New Zealand, their main trading partners. The island republic will be three hours ahead of Sydney for example.
Samoa gained independence from New Zealand in 1962. A long time ago, this South Pacific paradise was a German colony, which is reflected in their currency, Tala (from the German Taler). A Tala, WST, is worth around SEK 0.35. The best transitional currency for travellers to Samoa is Australian or New Zealand Dollars - and US Dollars.