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When did the 21st century start and end?
What is a century based on?
When did the 2000s start and end?
What year ends in a '1'?
The 21st Century Started in 2001. In 1999, the world was preparing for the New Year's party of a lifetime. The year number in the Gregorian calendar was about to tick over to 2000, supposedly ushering in not only the 21st century but also the 3rd millennium CE. However, the party was held one year too early—it should have been on January 1, 2001.
Jan 31, 2024 · Some say the old decade ended on December 31, 2019, and the start of the new one began January 1, 2020. For others, the new decade doesn’t start until January 1, 2021; the old one concluding on December 31, 2020. But which is correct?
Dec 20, 1999 · The year 2000 is special--even though it isn't the start of the 21st century--because it is a leap year. Julius Caesar devised the leap year to correct for the fact that the earth circles the sun ...
Nov 30, 2023 · Based on Anno domini, the year numbering system we use today, the 21st century started on January 1, 2001. In this case, the year ends in a “1.” Why? Based on our numbering system, Anno domini, there is no year zero. The year 1 BC was not followed by 0, but rather by year AD 1, so we count up from the year 1 AD as in the “21st century.”
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: 1740s BC: 1730s BC: 1720s BC: 1710s BC ...
Jul 20, 2018 · So the first decade of the 21st century contains years 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 and 2010. So year 2010 is the last year of the first decade of the twenty-first century. Roman numerals have historically been used to represent year numbers.
