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The third millennium is the current millennium in the Common Era, spanning the 21st to 30th centuries. Learn about its futures studies, astronomical events, population growth, climate change, extinction, and more.
- 21st century, 22nd century, 23rd century, 24th century, 25th century, 26th century, 27th century, 28th century, 29th century, 30th century
The 3rd millennium is the period of time from 2001 to 3000. Learn about the events, centuries and decades that will happen in this millennium, such as climate change, Easter dates and computer software issues.
3rd millennium BC · 3000–2001 BC 30th century BC: 29th century BC: 28th century BC: 27th century BC: 26th century BC: 25th century BC: 24th century BC: 23rd century BC: 22nd century BC: 21st century BC: 2nd millennium BC · 2000–1001 BC 20th century BC: 19th century BC: 18th century BC: 1790s BC: 1780s BC: 1770s BC: 1760s BC: 1750s BC ...
The 21st century started in 2001, not 2000, according to the Gregorian calendar. The web page explains why the year 2000 was one year too early and how different calendars use different year numbers. It also discusses the history and meaning of the year 0, the year 1 BCE, and the round number bias.
Learn about the concept of millennium, a period of 1,000 years, and its relation to the Gregorian calendar and the 21st century. Explore the history and science of time measurement, including the second and the leap second.