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A decade is ten years,so for at least the soonest it would be would be 2010, definitely 2011.
In true mathematical terms it should be 31 December 2010. However, the end of the second millennium was celebrated on 31 December 1999. On that basis, ten years from then would be 31 December 2009.
Whichever way you look at it, it cannot be 2011.
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When does the decade end?
11:59:59.9 PM, December 31, 2009.=================================I don't agree.The first year was the year ' 1 ', not ' 0 '. That's why the end of the first Century (100 years)was the end of the year ' 100 ', and the end of the 20th Century was the end of ' 2000 '.By definition, a decade is 10 years. The first decade consisted of the years [ 1 - 10 ], and endedat the end of the year ' 10 '. Add 10 years to that for every subsequent decade, and eventuallyyou wind up in our current era. The ends of decades occur at 11:59:59.9 PM on December 31stof 1990, 2000, and 2010.If you accept the reasoning concerning the Century but not concerning the decade, then youwind up in an awkward position, with the year 2000 being in the old Century but the new decade.Wikipedia resolves this problem by only having "9" years in the first "decade".The new decade does not start until Jan. 1, 2011 , one second past midnight on Dec 31st, 2010.When you refer to the "60's" you are refering to the years 1960 to 1969, ten years... just not the same as the decade of the 60's.
When does a decade end?
10 Years is a decade.
What century is 721?
The first Century ended at the end of the year 100.The second Century ended at the end of the year 200.The third Century ended at the end of the year 300.......The seventh Century ended at the end of the year 700.The eighth Century ended at the end of the year 800.The year 721 AD was in the eighth Century.
Which century was 1350 in?
The years 0 to the end of 999 are the 'first century'. Counting up from there, 1350 is in the '14th Century'.
When is the end of the decade?
December 31st, 2010.
