When was the 1990s?

The definition of the first decade is the same as the century division method, that is, every century is divided into ten years, the first decade is the first decade, and the first year is the first decade. There are no decades, decades, only the beginning and end of the century.

For example,1901~1910 was at the beginning of the 20th century; 1911~1920 was in the 1920s; 198 1 ~ 1990 was in the 1990s, and 199 1 ~ 2000 was at the end of the 20th century. This definition has been rarely used in recent ten years because of inconvenience, but it is easier to understand after adopting the American-style 80 and 90, that is, 1980 ~ 1989 is after 80, and 1990 ~ 1999 is after 90.

Extended data:

The name of dividing a century into ten consecutive years is usually applicable to the use of the chronological method. This decade has gone from "... the first 10" to "... the ninth in every century", such as 1990 ~ 1999, which is the 1990s (from Modern Chinese Dictionary, 6th edition, p. 946).

References:

Baidu Encyclopedia _ Year