21st century which years

Once in many years, there comes a date that stands out from the rest because it happens once in hundreds of years. And such an alignment of numbers will not happen again until 22 January , that's years. However, the math behind the special date comes with controversy as many have disputed whether the new millennium began on January 1, , or January 1, But many Twitter users shared messages about 21 January and expressed joy and surprise about the uniqueness of the date.

A day that comes once in a hundred years! Today is the 21st Day of the 21st Year of the 21st Century. One of those rarities that life throws your way to make the day special. ET NOW. Brand Solutions. Video series featuring innovators.

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Based on Anno domini , the year numbering system we use today, the 21st century started on January 1, Based on our numbering system, Anno domini , there is no year zero. Our conclusion? At the end of the day, astronomy rules the day, and calendars are imperfect. Referring to centuries by cardinal numbers, we have "the s" , "the s" , etc. Referring to centuries by ordinal numbers, we have "the 20th century" , "the 21st century" , etc.

Referring to decades by cardinal numbers, we have "the s" , "the s" , etc. Referring to decades by ordinal numbers, we would theoretically have "the nd decade , "the rd decade , etc.

Notice that one of these is not like the others. But I do understand our number system as well. For example, our ages. If someone is born on April 2, , their first birthday is held on April 2, On that date, they're actually starting to live in their SECOND year, not their first year, since they just lived through their first year. I actually try not to think about it too much or it'll blow my mind!