South Pacific island nation Samoa, positioned to the east of the International Date Line, on May 2011 decided to forego a day and shift to the time zone on its west. The reason for this shifting is to

In May 2011, the South Pacific nation of Samoa announced its decision to shift west of the International Date Line (IDL) by skipping December 30, 2011 [t1][t4]. The primary motivation for this change was to facilitate trade with its major economic partners, Australia and New Zealand [t1][t9]. Previously, being on the eastern side of the IDL meant Samoa was nearly a full day behind these neighbors, resulting in only four shared working days per week and hindering business efficiency [t4][t6]. Historically, Samoa had moved to the eastern side in 1892 to align with American traders, but its modern economic interests have shifted toward the Asia-Pacific region [t1][t10]. By moving west, Samoa aligned its calendar with its most valuable trading partners and became one of the first nations to welcome the new day, rather than the last [t5][t6].

Sources

1. [1] https://www.bbc.com/news/world-asia-16351377