Independence Days by FlaxmanR

Question 8

The island group was contested between Germany, Britain, and the United States at the end of the 19th century, but the country now bearing the name officially became independent of New Zealand in 1962. WHAT PACIFIC ISLAND NATION, which knows something about date changes following its jump across the International Date Line in 2011, celebrates the occasion on June 1 rather than the actual date of January 1 to avoid a glut of holidays around the turn of the year?