Regnal year dating
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). 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 [ordinal] day of [month], in the year of our Lord [year], and of the Independence of the United States of America the [year]." 2017 is the 242nd year of the Independence of the United States of America.
While not strictly a regnal year, time in the United States of America can be derived from the Declaration of Independence (July 4, 1776). Time is also sometimes reckoned in terms (and sessions, if necessary) of Congress; e.g.
The people of the country referred to that year by that name.
Era names were used for over two millennia by Chinese emperors and are still used in North Korea, Japan and Taiwan.
Regnal years are "finite era names", contrary to "infinite era names" such as Christian era, Jimmu era, Juche era, and so on.
In ancient times, calendars were counted in terms of the number of years of the reign of the current monarch.
It could last from one year to the length of the leader's reign.
If it lasted more than one year, numbers were appended to the era name.
The oldest dating systems were in regnal years, and considered the date as an ordinal, not a cardinal number.From 1368 until 1912 only one era name was used by each emperor, who was posthumously known by his era name.Korea used independent era names during reigning in all of its variety of nations.The Chinese eras or Nian Hao were used sporadically from 156 BC and continuously from 140 BC.Until 1367 several were used during each emperor's reign.