From Bvio

''가/이 이 문서와 합병해 주시면 되겠습니다.'' Era system '''Era name''' was an East Asian imperial practice of numbering years in an emperor's reign. It originated as a motto or slogan chosen by the emperor. Different East Asian countries utilized slightly different systems: *Chinese era name *Japanese era name *Korean era name *Vietnamese era name A similar practice has happened in the United Kingdom until quite recently. Acts of Parliament used to be dated according to the years of the reign of the current Monarch, so that "61 & 62 Vict c. 37" refers to the Local Government (Ireland) Act 1898 passed in the session of Parliament in the 61st/62nd year of Queen Victoria. ==External link== *Comparative timeline of Chinese, Japanese and Korean historical events ja:元号 zh-cn:年号