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The 21st century is the current century of the Anno Domini era or the Common Era, in accordance with the Gregorian calendar.It began on January 1, 2001, and will end on December 31, 2100. It is the first century of the 3rd millennium.It is distinct from the century known as the 2000s, which began on January 1, 2000 and will end December 31, 2099.he 21st century is the current century of the Anno Domini era or the Common Era, in accordance with the Gregorian calendar.
   The 20th century is the 20th group of 100 years, so it ended at  2000. If the century and the the digits they start with were the  same, I.E. the 19th Century was the years 1900 to 1999, then by  default the 1st Century would have to be the years 100 to 199.irst, the 1900s are slightly out of alignment  with the 20th century which is why peopl â¦ e confuse them. You are not  referring to the same years. So the 1900s refers to 1900 to 1999  whereas the 20th century refers to 1901 to 2000.