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Millennium:	3rd millennium
Centuries:	20th century – 21st century – 22nd century
Decades:	1980s 1990s 2000s – 2010s – 2020s 2030s 2040s
Years:	2009 2010 2011 – 2012 – 2013 2014 2015

From left, clockwise: The passenger cruise ship Costa Concordia lies capsized after the Costa Concordia disaster; Damage to Casino Pier in Seaside Heights, New Jersey as a result of Hurricane Sandy; People gather at a Mayan temple to commemorate the end of the Mayan calendar on December 21, when it was predicted a doomsday event would occur; NASA's Curiosity Rover lands on the surface of Mars; The Sandy Hook Elementary School shooting caused shock and outrage across the United States and the world; K-pop artist Psy performs his hit single Gangnam Style, which became a cultural phenomenon in 2012; the elementary particle, the Higgs boson, dubbed "The God Particle", is discovered by CERN and revolutionizes quantam physics; The 2012 Summer Olympics open in London.

2012 (twenty twelve, two thousand twelve, twenty twenteen, or two thousand twenteen) (MMXII) was a leap year starting on Sunday of the Gregorian calendar, the 2012th year of the Common Era (CE) and Anno Domini (AD) designations, the 12th year of the 3rd millennium, the 12th year of the 21st century, and the 3rd year of the 2010s decade.

The year 2012 was the International Year of Cooperatives and the Alan Turing Year.