The decade doesn't end until December

To the editor:

Any period of ten years may constitute a decade, but if you wish to celebrate "the second 10 years of the 21st century" as stated in your feature article in The Saturday Herald on January 4, 2020, you should wait until the end of that second ten years. That will happen at midnight on December 31, 2020. 

The first decade of the 21st centry ended December 31, 2010. The second began January 1, 2011.

—John Sickman

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