When does the new decade start?

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According to the calendar, because there is no "0" year, the new decade just started January 1, 2011.

Common use of the word decade, because we refer to the decade of the 80's or 90's, the new decade starts on January 1 of the decade that is being referred to. This is because it is illogical to say the decade of the 80's doesn't include 1980 but does include 1990. So, if you like the common use of the word decade, instead of the calendar use, the new decade will start on January 1, 2020.
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When does the new decade begin?

In 10 years after the one before, which 20 years back forward, which end up 40 before the next one. You get what im sayin yo?

When does a decade start?

Every 10 years. Well unless it's a trick question I would have thought at 00.01 on the 1st of January of the current set of 10 years. For example 00.01 01/01/2010 00.01 01/01

What year does a decade start?

as we are now in the 21st Century, the decades start as 2010, 2020, 2030, 2040, 2050, 2060, 2070, 2080, 2090 and the 22nd Century will start as 2100

When decade starts?

2010 January 1st at one second past the final stroke of midnight

Does 2010 or 2011 start the new decade?

In a technical sense, 2011 does start the new decade. It works this way because in the Julian Calendar, there is no year zero. In our calendar, it goes from year 1 B.C. to yea