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The , also known as , is the first of the two elements that identify years in the Japanese era calendar scheme. The second element, a number, indicates the number of years since the era began. For example, the current era, "Heisei", began in , so the current year in this scheme is "Heisei ". As elsewhere in East Asia, the use of ''nengō'' was originally derived from Chinese Imperial practice, although the Japanese system is independent of the Chinese, Korean and Vietnamese era-naming systems. Unlike some of these other similar systems, Japanese era names are still in use. Government offices usually require era names and years for official papers. The four era names used since the end of the Edo period in 1868 can be abbreviated by taking the first letter of their romanized names. For example, S55 means Shōwa 55 (i.e. 1980), and H22 stands for Heisei 22 (2010). At 64 years, Shōwa is the longest era to date. == Overview == (詳細はChina in 140 BC, and was adopted by Japan in AD 645, during the reign of Emperor Kōtoku. The first era name to be assigned was , celebrating the political and organizational changes which were to flow from the great . Although the regular practice of proclaiming successive era names was interrupted in the late seventh century, it was permanently re-adopted in 701 during the reign of Emperor Mommu (697–707). Since then, era names have been used continuously up through the present day.〔Brown, Delmer ''et al.'' (1979). ''Gukanshō,'' p.32.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Japanese era name」の詳細全文を読む スポンサード リンク
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