Passage: The 21st century is the current century of the Anno Domini era or 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 on December 31, 2099.

Question: Based on this passage, when did the 21st century begin and end?
Steam of consciousness below:
This is the relevant information: It began on January 1, 2001 and will end on December 31, 2100.
So, the answer is began on January 1 , 2001 and will end on December 31 , 2100.