# How Long Is a Decade And a Century?

**URL:** <https://howtodiscuss.com/t/how-long-is-a-decade-and-a-century/49>\
**Category:** Education\
**Created:** [April 28, 2020, 9:49am UTC](https://howtodiscuss.com/t/how-long-is-a-decade-and-a-century/49 "2020-04-28T09:49:28Z")\
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**Author:** ![Areesha](https://howtodiscuss.com/user_avatar/howtodiscuss.com/areesha/32/4784_2.png) [@Areesha](https://howtodiscuss.com/u/Areesha)\
**Post date:** [November 25, 2020, 5:44pm UTC](https://howtodiscuss.com/t/how-long-is-a-decade-and-a-century/49/5 "2020-11-25T17:44:24Z")

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## How many years are in a century, a millennium, and a decade?

By the convention of the Gregorian calendar, often known as the Gregorian Calendar, dates are expressed in terms of years:

| 1000 years | 1 century | 1 decade |
| --- | --- | --- |
| 10 centuries | 10 decades | 10 years |
| 1 millennium | 100 years | 3652 days |

There are three distinct methods for calculating the millennium.

**Method 1:** 1 millennium is estimated from the years x001 to y002, or from 1 to 1010 for millennium I and 1002 to 2002 for millennium II.

**Method 2:** 1 the century is determined from the years x000 to x999, which translates to 1000 to 1999 being the millennium and 2000 to 2999 being the millennium 2000.

**Method 3:** 1 millennium is counted from the years x001 to y000, with the first millennium spanning the years 1 to 1000 AD, the second from 1001 to 2000, and the third from 2001 to 3000.

This computation places 2020 in the third millennium or the 2000 millennium.

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