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A regnal year is a year of the reign of a sovereign, from the Latin ''regnum'' meaning kingdom, rule. The oldest dating systems were in regnal years, and considered the date as an ordinal, not a cardinal number. For example, a monarch could have a first year of rule, a second year of rule, a third, and so on, but a zero year of rule would be nonsense. Applying this ancient epoch system to modern calculations of time, which include zero, is what led to the debate over when the third millennium began. Regnal years are "finite era names", contrary to "''infinite'' era names" such as Christian era, Jimmu era, Juche era, and so on. ==Reckoning in various cultures== In ancient times, calendars were counted in terms of the number of years of the reign of the current monarch. Reckoning long periods of times required a king list. The oldest such reckoning is preserved in the Sumerian king list. In England, and later the United Kingdom, until 1963, each Act of Parliament was defined by its serial number within the session of parliament in which it was enacted, which in turn was denoted by the regnal year or years of the monarch in which it fell. In Canada, acts of Parliament are dated by the session, the Parliament, the regnal year, and the calendar year. So, for example, a bill passed in the second session during the period spanning 2007–2008 would be dated thus: Second Session, Thirty-ninth Parliament, 56–57 Elizabeth II, 2007–2008 The Zoroastrian calendar also operated with regnal years following the reform of Ardashir I (3rd century). While not strictly a regnal year, time in the United States of America can be derived from the Declaration of Independence (July 4, 1776). For example, the U.S. Constitution is dated as signed in "the Year of our Lord one thousand seven hundred and Eighty seven and of the Independence of the United States of America the Twelfth," and Presidential proclamations will often be ended "IN WITNESS WHEREOF, I have hereunto set my hand this () day of (), in the year of our Lord (), and of the Independence of the United States of America the ()." is the }} year of the Independence of the United States of America. Time is also sometimes reckoned in terms (and sessions, if necessary) of Congress; e.g. House of Representatives Bill 2 of the 112th Congress is dated "112th CONGRESS, 1st Session".〔(112 H.R. 2 )〕 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「Regnal year」の詳細全文を読む スポンサード リンク
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