3rd millennium

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Millennia:	2nd millennium 3rd millennium 4th millennium
Centuries:	21st century 22nd century 23rd century 24th century 25th century 26th century 27th century 28th century 29th century 30th century

In contemporary history, the third millennium is a period of time that most^{[citation needed]}, such as the United States Naval Observatory, claimed began on January 1, 2001, and will end on December 31, 3000, of the Gregorian calendar.^[1] Stephen Jay Gould argued that it is not possible to decide if the millennium began January 1, 2000, or January 1, 2001.^[2] The Associated Press reported that the third millennium began January 1, 2001, but also reported that celebrations in the US were generally more subdued at the beginning of 2001, compared to the beginning of 2000.^[3] This is the third period of one thousand years in the Anno Domini or Common Era.

As this millennium is currently in progress, its first two decades, the past 2000s and the current 2010s, are the subject of the historian's attention. The remaining part of the 21st century and longer-term trends are researched in futures studies.

Centuries and decades

21st century	2000s^[4]	2010s	2020s	2030s	2040s	2050s	2060s	2070s	2080s	2090s
22nd century
23rd century
24th century
25th century
26th century
27th century
28th century
29th century
30th century

Notes

↑ United States Naval Observatory, "The 21st Century and the 3rd Millennium:When Did They Begin?" (Washington, DC, June 14, 2011).
↑ Stephen Jay Gould, Questioning the Millennium: A Rationalist's Guide to a Precisely Arbitrary Countdown (New York: Harmony Books, 1999), ch 2.
↑ Associated Press, "Y2K It Wasn't, but It Was a Party", Los Angeles Times, January 1, 2001.
↑ Debate exists as to whether 2000 is the last year of the 2nd millennium.

v t e Millennia

AD	1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th and beyond

BC	200th BC and prior 200th BC to 11th BC 10th BC 9th BC 8th BC 7th BC 6th BC 5th BC 4th BC 3rd BC 2nd BC 1st BC

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