What is the millennium year?

Answer 1

Let's work this out together; by the end it will make sense.

In a base ten systen (our numbering system based on the typical number of digits humans have on their hands), we begin counting at the number one, completing each set after ten. Like so: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

After each set of ten, we begin again at one; like so: 11, 12, and 21, 22, etc.

After ten sets of ten we reach one hundred, repeating the previous method. We do not stop countuing one hundred at 99. Likewise we do not stop counting to one thousand at 999.

Now, ten years is a decade, one hundred is a century, and one thousand is a millenium. At ten plus one day of the next year, you have a decade plus one day until 365.25 have passed and you have one decade and one year. The same is true for a century and a millenium.

The first century, figuratively began at 1 AD, as did the first millenium. the second century began on 1 January 101 AD and ended 31 December 200 AD. On 1 January 201 AD, the third century AD began.

Now extend this to the millenium: 1 January 1 AD to 31 December 1000 AD was the first millenium. 1 January 1001 AD to 31 December 2000 was the second millenium. The third began 1 January 2001 AD.

We always begin counting with one.