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Difino
| • | The 20th century lasted from 1901 to 2000 in the Gregorian calendar. Common usage sometimes regards it as lasting from 1900 to 1999, but this is incorrect since counting of calendar years begins with the year 1.The 20th century is also sometimes known as the nineteen hundreds (1900s). Decades are almost always considered as starting with the "0" year and named accordingly ("1960s", etc.).
However, a number of arguments have been used to justify the common usage. One was advanced, erroneously, by Stephen Jay Gould. He claimed that the first decade had only nine years, thus contradicting the definition of decade equaled 10 years. Another argument is that the astronomical year numbering system for years does have a year zero, the year normally known as 1 BC. In 2000 the International Organization for Standardization clarified ISO 8601 to use the astronomical year numbering system, which could be interpreted as retrospectively endorsing all the people who had celebrated the new century a few months earlier.
The term is also used to describe various periods that overlap with the calendar definition, most notably the Short twentieth century, which claims that the 20th Century spanned from 1914 to 1989, rendering the pre-WWI 1900s into the 19th Century and putting the 1990s at the beginning of the 21st Century.
Indeed, the part of the 20th Century before World War I is quite identical to the late 1800s culturally and technologically and the 1990s decade pointed in many ways (such as the rise of the Internet) to the 21st Century and is seen by some as not being truly a part of the 20th Century.
Source: [wikipedia: 20th century]
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