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summonedskulon End of a Decade

but you're still wrong - this decade ends at the last moment of 2019..that's the agreed popular opinion - didn't you even read the Wikipedia link?

summonedskulon End of a Decade

No you are wrong - The word 'decade' is not tied to any specific set of 10 years, so you can mark off any set of 10 years and call it a decade: 2000-2009, or 2005-2014, for example. By your logic the year 2000 should be part of the 90's which it wasn't.

summonedskulon End of a Decade

Wrong - https://en.wikipedia.org/wiki/2010s

The 2010s is the current decade in the Gregorian calendar that began on 1 January 2010, and will end on 31 December 2019.