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Guam Standard Time is 10 hours ahead of Greenwich Mean Time ( GMT+10 ).
Print this map. Guam is an unincorporated and organized territory of the United States, and is located in the western Pacific Ocean. The island was inhabited by Chamorros some 4,000 years ago, and was discovered by Ferdinand Magellan in 1521. Spainestablished the first colony in 1668, and the island became an important stopover for the Spanish Manila Galleons.