T told myself I was done here but a friend suggested I post this.

calendar started with year 1. A decade has 10 years. A century has 100 years

year 1 thru 100 1st century
101 thru 200 2nd century
etc, etc, etc, etc, etc. etc, etc, etc, etc, etc, etc, etc, etc, etc, etc, etc,

year 1801 thru 1900 19th century
1901 thru 2000 20th century
year 2001 thru 2010 1st decade 21st century
year 2011 thru 2020 2nd decade 21st century

Therefore we are at the end of the second decade of the 21st century

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Bob DeWoody

My motto: Never do today what you can put off until tomorrow as it may not be required. This no longer applies in light of current events.

How most of look at this subject is by using the ISO 8601 standard.

In the AD year numbering system, whether applied to the Julian or Gregorian calendars, AD 1 is immediately preceded by 1 BC. There is no year "0" between them. There are debates as to whether a new century or millennium begin on a year ending in "00" or "01".[9]

For computational reasons, astronomical year numbering and the ISO 8601 standard designate years so that AD 1 = year 1, 1 BC = year 0, 2 BC = year −1, etc. In common usage, ancient dates are expressed in the Julian calendar, but ISO 8601 uses the Gregorian calendar and astronomers may use a variety of time scales depending on the application. Thus dates using the year 0 or negative years may require further investigation before being converted to BC or AD.

Cheers.

So if I cut something to 3/4 of an inch I have nothing because an inch does not start until 1?
If I cut it at 5 inches I only have 4?
Not making much sense to me.

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An inch starts at one inch, if you cut 3/4" you have 1/4" left.

We never had a year zero we went from 1BC to 1AD.

Write zero in Roman Numerals!

IIIIIV

nullia

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Bob Smith
Member of Seti PIPPS (Pluto is a Planet Protest Society)
Somewhere in the (un)known Universe?

An inch starts at one inch, if you cut 3/4" you have 1/4" left.

We never had a year zero we went from 1BC to 1AD.

Write zero in Roman Numerals!

Zero was known but not expressed. It was not until our European Hindo-european languages accepted the idea of ziffar \ zero that we could express in written language \ maths the idea of naught.

However zero and null are not the same in any way.

Our christian calendar starts at 0 \ zero point as that was when Jesus was born. His first birthday was when he was 1 year older. His 100th was when he was on the first moment or the apex of 100 years.

2020 is 2 decades on top of two millenia.

Whichever way we look at it 10 is 10 or 9.999r or 10.001r-.

All lead to the same. 2020 is a cusp moment in which the new decade begins just as the new life of the christ and therefore christain calendar existed on day 0.1r-.

Each new year (for me) starts with 0.0r1

An inch starts at one inch, if you cut 3/4" you have 1/4" left.

We never had a year zero we went from 1BC to 1AD.

Write zero in Roman Numerals!

Zero was known but not expressed. It was not until our European Hindo-european languages accepted the idea of ziffar \ zero that we could express in written language \ maths the idea of naught.

However zero and null are not the same in any way.

Our christian calendar starts at 0 \ zero point as that was when Jesus was born. His first birthday was when he was 1 year older. His 100th was when he was on the first moment or the apex of 100 years.

2020 is 2 decades on top of two millenia.

Whichever way we look at it 10 is 10 or 9.999r or 10.001r-.

All lead to the same. 2020 is a cusp moment in which the new decade begins just as the new life of the christ and therefore christain calendar existed on day 0.1r-.

Each new year (for me) starts with 0.0r1

Seems there are other counting issues. December 25 isn't January 1. So did we have a few day year of ZERO? Or couldn't the astronomers fix the date of the solstice? Were there that many missed leap years from when they started counting?

Actually it depends if you are talking about a cardinal decade or an ordinal decade.
An ordinal decade: The last year of the decade is 2020, the first year of the new decade is 2021.
A cardinal decade: The last year of the decade is 2019, the first year of the new decade is 2020.
I think most people use a cardinal decade. The same goes for centuries. For instance in Scandinavia we never say that we now live in the 21'st century.
https://en.wikipedia.org/wiki/Decade

...
A cardinal decade: The last year of the decade is 2019, the first year of the new decade is 2020.
I think most people use a cardinal decade. The same goes for centuries. For instance in Scandinavia we never say that we now live in the 21'st century.
https://en.wikipedia.org/wiki/Decade

Here in the UK I would say we live in the 20th century.

I think some have a problem counting from zero.

For me it is a question of when something existed from. For example:

Was you first year from zero \ birth to 1 OR from 1 to 2?

Also some don't feel comfortable with the undefinable split between one moment and the next. Say between midnight new years eve and new years day. It too is a kind of zero.

It's an interesting discussion.

Which side do we fall on the breadth of a hair.

Or alternatively we could just accept the hair \ cusp - ie: the absolute 0, 10, 20 etc.

Numbers is a funny game.
Look at one's age, it can be seen 3 different ways.
For example.
One is born July 1st 2000. 365 days later one is 1 year old.
So 2 decades later, one will be 20 - or will they?
January 1st to June 30th 2020 is still 2020, 2 decades on from 2000.
Bu they will still be 19 until July 1st anyway.
When talking of age, the D.O.B has to be seen as point zero.

Which is why I'll stick with using the ISO 8601 standard for dating. ;-)

Hell we've been following ISO standards since the '70's here and it's about time that the last 2 bastions of a lot of non-ISO standards need to take the leap to catch up with the rest of the world (it's not communism you know, it's just plain common sense).

Then we could all get away from stupid "imperial" and "U.S. short" weights/measures all together from what are now today such small markets.

Then we only have to convince the religious about their silly calender and its inherent failures which are based on the limitations Roman numeric system of the time for starters, but then again there is also some dispute as to the amount of time passing between 1BC and 1AD in itself as well. ;-)

Cheers.

... 1BC and 1AD in itself as well. ;-)

1BC to 1AD is an odd one in itself as that is two years (or near enough.)

-1 to +1 is 2 by my maths? (Or 1.99r)

Which just convinces me that where we consider a decade actually starts is oft more about numerology than fact.

...limitations Roman numeric system...

Rome had a system of decimals (poorly inscribed.) I wonder if the imperial measures of 12 month, 12 inches, a dozen eggs.. came from very late rome 400+ AD (or christo-rome?.)

What was celebrated on the 1st January 2000 was the first time in history that any 4 digit year had a 2 at the beginning of it.

So, what happened to 2000 BC?

What was celebrated on the 1st January 2000 was the first time in history that any 4 digit year had a 2 at the beginning of it.

So, what happened to 2000 BC?

Or 2000 on the Jewish, Aztec, Chinese, ... calendars?

My post was referring to the Western world in modern times history.

Fixed. :-)

What was celebrated on the 1st January 2000 was the first time in history that any 4 digit year had a 2 at the beginning of it.

At least get it right!