On Monday, 30 December, 2019 19:29, Michael Falconer 
<michael.j.falco...@gmail.com> wrote:

> As we approach the end of yet another year ( and indeed decade ).

Technically, every year is the end of a decade, if one means the immediately 
preceding ten years.

However, if you mean the end of the second decade of the 21st century, you will 
have to wait another year for that.  January 1st, 0001 AD was the first day of 
the year 1.  The first decade ended at the end of December 31st 0011 AD, not 
December 31st, 0010 AD. (if following the proleptic Gregorian calendar).

The day before January 1st 0001 AD was December 31st 0001 BC.

The first day of the 21st century was January 1st, 2001; it was also the first 
day of the first decade of the 21st century.
The first day of the 2nd decade of the 21st century was January 1st, 2011.
Next year is the last year of the 2nd decade of the 21st century.
The 3rd decade of the 21st century will commence at midnight January 1st, 2021.

There is no "year 0" between 1 BC and 1 AD.  This is perhaps the most common 
fencepost problem in existance.  The "great renaming" of AD to CE and doing 
away with BC by replacing them with "off by one" numbers less than 1 does not 
change the fact that there was, in fact, no year 0.

-- 
The fact that there's a Highway to Hell but only a Stairway to Heaven says a 
lot about anticipated traffic volume.



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