Hawaii (English pronunciation: /həˈwaɪʲi/ hə-WY-(y)ee; locally, [həˈwɐ(ɪ)ʔi]; Hawaiian: Hawaiʻi [həˈvɐiʔi]) is the 50th and most recent U.S. state to join the United States, having joined on August 21, 1959. Hawaii is the only U.S. state located in Oceania and the only one composed entirely of islands. It is the northernmost island group in Polynesia, occupying most of an archipelago in the central Pacific Ocean. Hawaii is the only U.S. state not located in the Americas. The state does not observe daylight saving time.