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Western Samoa changes the International Date Line, causing Monday (July 4) to occur twice, resulting in a leap year with 367 days.
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Samoa
Island country in the Pacific Ocean
Samoa, officially the Independent State of Samoa, is an island country in Polynesia, part of Oceania, in the South Pacific Ocean. It consists of two main islands, two smaller, inhabited islands, and several smaller, uninhabited islands, including the Aleipata Islands. Samoa is…Source: Wikipedia (CC BY-SA)
International Date Line
Imaginary line that demarcates the change of one calendar day to the next
The International Date Line (IDL) is the line extending between the South and North Poles that is the boundary between one calendar day and the next. It passes through the Pacific Ocean, roughly following the 180.0° line of longitude and deviating to pass around some territories…Source: Wikipedia (CC BY-SA)