May 17, 2022

A millennium, from Latin 'mille', thousand and 'annus', year, is a continuous period of a thousand years. In a more specific sense, a millennium is one of the thousand-year periods in which the era regularly divides time. The first millennium, followed by the second millennium and the third millennium. The first millennium then consists of the first thousand years, and starts with the year 1 and ends when 1000 years have passed, so with the year 1000. The second millennium starts with the year 1001 and ends with the year 2000. The third millennium started with the year 2001 Although the Gregorian calendar did not exist then, the first year is the year 1. So there is no year 0. The international standard ISO 8601 uses the proleptic Gregorian calendar and although it has a year 0000, that is the year 1 BC ., so the year before year 1.

Beginning of a millennium

In the strict sense, the first millennium begins with the year 1. To many people, a new period seems to begin when a year begins with the year ending in 000, such as 2000. They assume that a new millennium begins with the dawn of such a year. This is also the theme of the Millennium Error. The international standard ISO 8601 also starts a millennium with a year with a year that is divisible by 1000. The period 1000 to 1999 (the four-digit years beginning with 1) form a millennium, namely the second.

See also

Millennium issue List of units of time Millennium bug M-DISC