Samoa skipped December 30, 2011, when it moved across the International Date Line.
Before the change, Samoa was 21 hours behind Sydney and had calendar dates shared with much of the eastern Pacific. At midnight at the end of December 29, 2011, the country advanced its clocks by 24 hours, making the next calendar date December 31. December 30 therefore did not occur in Samoa.
The government made the change to align business days more closely with Australia, New Zealand, and Asian trading partners. Samoa had previously been on the eastern side of the date line, despite its geographic and economic ties to countries west of it. The shift also changed the country's time-zone relationship with nearby American Samoa, which remained on the previous side.
The event is often described as “losing a day,” but no physical time vanished. The decision changed the civil calendar and local clock labels. Samoa later observed New Year's Eve one day earlier relative to its former calendar arrangement.