Adoption of the Gregorian calendar

The adoption of the Gregorian Calendar was an event in the modern history of most nations and societies, marking a change from their traditional (or old style) dating system to the modern (or new style) dating system that is widely used around the world today. Some countries adopted the new calendar from 1582, some did not do so before the early twentieth century, and others did so at various dates between; however a number continue to use a different civil calendar. For many the new style calendar is only used for civil purposes and the old style calendar remains used in religious contexts. Today, the Gregorian calendar is the world's most widely used civil calendar.[1][2][3] During – and for some time after – the change between systems, it has been common to use the terms Old Style and New Style when giving dates, to indicate which calendar was used to reckon them.

The Gregorian calendar was decreed in 1582 by the papal bull Inter gravissimas by Pope Gregory XIII, to correct the erroneous assumption in the then-current Julian calendar that a year lasts 365.25 days, when in reality it is about 365.2422 days. (For a more detailed explanation, see the Grgorian calendar article). Although Gregory's reform was enacted in the most solemn of forms available to the Church, the bull had no authority beyond the Catholic Church and the Papal States. The changes he was proposing were changes to the civil calendar, over which he had no formal authority. They required adoption by the civil authorities in each country to have legal effect.

The bull became the canon law of the Catholic Church in 1582, but it was not recognised by Protestant churches, Eastern Orthodox Churches, and a few others. Consequently, the days on which Easter and related holidays were celebrated by different Christian churches diverged.

Reforma Gregoriana del Calendario Juliano
Lunario Novo, Secondo la Nuova Riforma della Correttione del l'Anno Riformato da N.S. Gregorio XIII, printed in Rome by Vincenzo Accolti in 1582, one of the first printed editions of the new calendar.

Adoption in Catholic countries

Catholic states such as France, the Italian principalities, Poland, Spain (along with her European and overseas possessions), Portugal and the Catholic states of the Holy Roman Empire were first to change to the Gregorian calendar. Thursday, 4 October 1582 was followed by Friday, 15 October 1582, with ten days skipped. Countries that did not change until the 18th century had by then observed an additional leap year (1700), necessitating the dropping of eleven days. Some countries did not change until the 19th or 20th century, necessitating one or two further days to be omitted from the calendar.

Philip II of Spain decreed the change from the Julian to the Gregorian calendar,[4] which affected much of Roman Catholic Europe, as Philip was at the time ruler over Spain and Portugal as well as much of Italy. In these territories, as well as in the Polish–Lithuanian Commonwealth (ruled by Anna Jagiellon) and in the Papal States, the new calendar was implemented on the date specified by the bull, with Julian Thursday, 4 October 1582, being followed by Gregorian Friday, 15 October 1582; the Spanish and Portuguese colonies followed somewhat later de facto because of delay in communication.[5]

Other Catholic countries soon followed. France adopted the new calendar with Sunday, 9 December 1582, being followed by Monday, 20 December 1582.[6] The Dutch provinces of Brabant and Zeeland, and the States General adopted it on 25 December of that year; the provinces forming the Southern Netherlands (modern Belgium) except the Duchy of Brabant adopted it on 1 January 1583; the province of Holland adopted it on 12 January 1583.[7] The seven Catholic Swiss cantons adopted the new calendar in January 1684 while Geneva and several Protestant cantons adopted it in January 1701 or at other dates throughout the 18th century. The two Swiss communes of Schiers and Grüsch were the last areas of Western and Central Europe to switch to the Gregorian calendar, in 1812.[8]

Adoption in Protestant countries

Many Protestant countries initially objected to adopting a Catholic innovation; some Protestants feared the new calendar was part of a plot to return them to the Catholic fold.[9] In England, Queen Elizabeth I and her privy council had looked favourably to a Gregorian-like royal commission recommendation to drop 10 days from the calendar but the virulent opposition of the Anglican bishops, who argued that the Pope was undoubtedly the fourth great beast of Daniel, led the Queen to let the matter be quietly dropped.[10] In the Czech lands, Protestants resisted the calendar imposed by the Habsburg Monarchy. In parts of Ireland, Catholic rebels until their defeat in the Nine Years' War kept the "new" Easter in defiance of the English-loyal authorities; later, Catholics practising in secret petitioned the Propaganda Fide for dispensation from observing the new calendar, as it signalled their disloyalty.[11]


The Lutheran Duchy of Prussia, until 1657 still a fiefdom of Roman Catholic Poland, was the first Protestant nation to adopt the Gregorian calendar. Under influence of its liege lord, the King of Poland, it agreed in 1611 to do so. So 22 August was followed by 2 September 1612. However, this calendar change did not apply for other territories of the Hohenzollern, such as Berlin-based Brandenburg, a fief of the Holy Roman Empire.


Through Ole Rømer's influence, Denmark in 1700, which then included Norway, adopted the solar portion of the Gregorian calendar with Sunday, 18 February 1700, being followed by Monday, 1 March 1700, simultaneously with the Brandenburg-Pomerania and other Protestant estates of the Holy Roman Empire.[12] None of these states adopted the lunar portion, instead calculating the date of Easter astronomically using the instant of the vernal equinox and the full moon according to Kepler's Rudolphine Tables of 1627; this combination was referred to by the Protestant estates as the "improved calendar" (Verbesserte Kalender) and considered to be distinct from the Gregorian. They finally adopted the Gregorian calculation of Easter in 1774.[13] The remaining provinces of the Dutch Republic adopted the Gregorian calendar on 12 July 1700 (Gelderland), 12 December 1700 (Overijssel and Utrecht), 12 January 1701 (Friesland and Groningen) and 12 May 1701 (Drenthe).[14]


Almanacka 1753
Swedish Almanach of 1753

Sweden's transition to the Gregorian calendar was difficult and protracted. Sweden started to make the change from the Julian calendar and towards the Gregorian calendar in 1700, but it was decided to make the (then 11-day) adjustment gradually by excluding the leap days (29 February) from each of 11 successive leap years, 1700 to 1740. Meanwhile, the Swedish calendar would be out of step with both the Julian calendar and the Gregorian calendar for 40 years; also, the difference would not be constant but would change every four years. This system had potential for confusion when working out the dates of Swedish events in this 40-year period. To add to the confusion, the system was poorly administered, and the leap days that should have been excluded in 1704 and 1708 were not excluded. The Swedish calendar (according to the transition plan) should have been 8 days behind the Gregorian but was 10 days behind. King Charles XII recognised that the gradual change to the new system was not working, and he abandoned it. Rather than proceeding directly to the Gregorian calendar, it was decided to revert to the Julian calendar. This was achieved by introducing the unique date 30 February in 1712, adjusting the discrepancy in the calendars from 10 back to 11 days. Sweden finally adopted the solar portion of the Gregorian calendar in 1753, when Wednesday, 17 February, was followed by Thursday, 1 March. Since Finland was under Swedish rule at that time, it did the same.[15] The Russian Empire's 1809 conquest of Finland did not revert this, since autonomy was granted, but government documents in Finland were dated in both the Julian and Gregorian styles. This practice ended when independence was gained in 1917.

Great Britain and its colonies

William Hogarth 028
William Hogarth painting: Humours of an Election (c. 1755), which is the main source for "Give us our Eleven Days".

Through enactment of the Calendar (New Style) Act 1750, Great Britain and its colonies (including parts of what is now the United States) adopted the Gregorian calendar in 1752, by which time it was necessary to correct by 11 days. Wednesday, 2 September 1752, was followed by Thursday, 14 September 1752. Claims that rioters demanded "Give us our eleven days" grew out of a misinterpretation of a painting by William Hogarth. In Great Britain, the term "New Style" was used for the calendar and the Act omits any acknowledgement of Pope Gregory: the Annexe to the Act established a computation for the date of Easter that achieved the same result as Gregory's rules, without actually referring to him.[16]

With the same Act, the Empire (except Scotland, which had already done so from 1600) changed the start of the civil year from 5 April to 1 January. Consequently, the custom of dual dating (giving a date in both old and new styles) can refer to the Julian/Gregorian calendar change, or to the start of year change, or to both.

The British tax year traditionally began on Lady Day (25 March) on the Julian calendar and thus became 5 April, which was the "Old Style" equivalent. A 12th skipped Julian leap day in 1800 changed its start to 6 April. It was not changed when a 13th Julian leap day was skipped in 1900, so the tax year in the United Kingdom still begins on 6 April.

Adoption in the Americas

The European colonies of the Americas adopted the change when their mother countries did. New France and New Spain had adopted the new calendar in 1582. The Gregorian calendar was applied in the British colonies in Canada and the future United States east of the Appalachian Mountains in 1752. In Alaska, the change took place after the United States purchased Alaska from Russia, with Friday, 6 October 1867 being followed by Friday, 18 October. Instead of 12 days, only 11 were skipped, and the day of the week was repeated on successive days, because at the same time the International Date Line was moved, from following Alaska's eastern border with Canada to following its new western border, now with Russia.[17]

Adoption in Eastern Europe

Partial Russian text of the decree adopting the Gregorian calendar in Russia as published in Pravda on 25 January 1918 (Julian) or 7 February 1918 (Gregorian).

Many of the countries of eastern Europe were Eastern Orthodox or Islamic and adopted the Gregorian calendar much later than western Christian countries. Roman Catholic countries such as the Polish–Lithuanian Commonwealth adopted the "new style" (N.S.) Gregorian calendar in 1582 (switched back in 1795 after Third Partition of Poland), but the switch to the Gregorian calendar for secular use occurred in Eastern Orthodox countries as late as the 20th century  – and some religious groups in some of these countries still use the "old style" (O.S.) Julian calendar for ecclesiastical purposes.

The Kingdom of Bulgaria changed from the Julian to the Gregorian calendar during the First World War on 31 March 1916, where the next day was 14 April 1916.[18]

The Ottoman Empire's Rumi calendar, used for fiscal purposes, was realigned from a Julian to a Gregorian starting on 16 February/ 1 March 1917. The beginning of the year was reset to 1 January starting in 1918. The numbering of the years, though, remained uniquely Turkish until the Gregorian calendar was introduced for general purposes on 1 January 1927.[a]

In Russia, the Gregorian calendar was accepted after the October Revolution. On 24 January 1918 the Council of People's Commissars issued a decree that Wednesday, 31 January 1918, was to be followed by Thursday, 14 February 1918, thus dropping 13 days from the calendar. With the change, the October Revolution itself, once converted, took place on November 7. Articles about the October Revolution which mention this date difference tend to do a full conversion to the dates from Julian to the Gregorian calendar. For example, in the article "The October (November) Revolution" the Encyclopædia Britannica uses the format of "25 October (7 November, New Style)" to describe the date of the start of the revolution.[19]

Other countries of eastern Europe, most notably Eastern Orthodox countries, adopted the Gregorian calendar in the 1910s or early 1920s. Romania adopted it in 1919, with 31 Mar 1919 being followed by 14 Apr 1919. The last country of Eastern Orthodox Europe to adopt the Gregorian calendar for civil purposes was Greece, at the time under military administration following the 11 September 1922 Revolution, with Wednesday 15 February 1923 being followed by Thursday 1 March 1923.[12][20] Turkey adopted it on 1 Jan 1927. The Soviet decree expressly limited the reform to lay (i.e. non-religious) matters, as did the Greek decree. None of these reforms affected the dates of religious holidays. (See below.)

Non-adoption by Eastern Orthodox and Oriental Orthodox churches

While the civil administrations of eastern European countries adopted the Gregorian calendar in the 1910s or early 1920s, none of the national Eastern Orthodox Churches have recognised the Gregorian calendar for church or religious purposes. Instead, a Revised Julian calendar was proposed in May 1923 at the Pan-Orthodox Congress of Constantinople. It uses a different leap year rule, modifying a proposal of 1785[21] in such a way as to maximise the time before its dates start to diverge from Gregorian. There will be no difference between the two calendars until 2800.

The Greek Orthodox Church of Jerusalem, Russian Orthodox Church, Serbian Orthodox Church, Georgian Orthodox and Apostolic Church, Polish Orthodox Church, Macedonian Orthodox Church and the Greek Old Calendarists did not accept the Revised Julian calendar, and continue to celebrate Christmas on 25 December in the Julian calendar, which is 7 January in the Gregorian calendar until 2100.

All of the other Eastern churches, the Oriental Orthodox churches (Coptic Orthodox Church of Alexandria, Ethiopian Orthodox Tewahedo Church, Eritrean Orthodox Tewahdo Church, and Syriac Orthodox Church) continue to use their own calendars, which usually result in fixed dates being celebrated in accordance with the Julian calendar. This is most interesting in the case of the Syriac Orthodox Church, as one of its Patriarchs Ignatius Nemet Allah I was one of the nine scholars who devised the Gregorian calendar.[22] The Indian Orthodox Church uses the Gregorian calendar along with their autonomous Syriac Orthodox counterparts in India, the Malankara Jacobite Syriac Orthodox Church.

The Armenian Apostolic Church adopted the Gregorian calendar in 1923, except in the Armenian Patriarchate of Jerusalem, where the old Julian calendar is still in use.[23][24]

Adoption in East Asia

Japan decided to officially replace its traditional lunisolar calendar with the Gregorian calendar in 1872, so the day following the second day of the twelfth month of the fifth year of the Meiji emperor's rule, became 1 January 1873. (The Japanese rendering of the Western months is simply ichi-gatsu or "One-month" for January, ni-gatsu or "Two-month" for February, etc.[25]) This brought Japan's calendar in alignment with that of the major Western powers (excluding Russia). To this day, however, it is common to use Nengo, reign names instead of the Common Era or Anno Domini system, especially for official documents; for instance, Meiji 1 for 1868, Taishō 1 for 1912, Shōwa 1 for 1926, Heisei 1 for 1989, and so on. Still, this system has increasingly been replaced in popular usage by the "Western calendar" (西暦, seireki) over the course of the twentieth century.

Korea adopted the Gregorian calendar on 1 January 1895 with the active participation of Yu Kil-chun.[26] Although the new calendar continued to number its months, there were multiple systems used to refer to its years: during the Joseon Dynasty, in 1895–97, its years were numbered from the founding of that dynasty, regarding 1392 as year one;[27] then between 1897 and 1910, and again from 1948 to 1962, Korean era names were used for its years; and between 1910 and 1945, when Korea was under Japanese rule, Japanese era names were used to count the years of the Gregorian calendar used in Korea.

In South Korea, from 1945 until 1961, Gregorian calendar years were also counted from the foundation of Gojoseon in 2333 BC (regarded as year one), the date of the legendary founding of Korea by Dangun, hence these Dangi (단기) years were 4278 to 4294. This numbering was informally used with the Korean lunar calendar before 1945 but is only occasionally used today. North Korea from 1997 officially counts years based on the Juche era, the first year of which is 1912.

The Republic of China (ROC) formally adopted the Gregorian calendar at its founding on 1 January 1912, but China soon descended into a period of warlordism with different warlords using different calendars. With the unification of China under the Kuomintang in October 1928, the Nationalist government decreed that effective 1 January 1929 the Gregorian calendar would be used. China retained the Chinese traditions of numbering the months and a modified Era System, backdating the first year of the ROC to 1912; this system is still in use in Taiwan where the ROC government retains control. Upon its foundation in 1949, the People's Republic of China continued to use the Gregorian calendar with numbered months, but abolished the ROC Era System and adopted Western numbered years.

Countries that used lunisolar calendars

Japan, Korea, and China started using the Gregorian calendar on 1 January 1873, 1896, and 1912, respectively.[28][29] They had used lunisolar calendars previously. None of them used the Julian calendar; the Old Style and New Style dates in these countries usually mean the older lunisolar dates and the newer Gregorian calendar dates respectively. In these countries, the old style calendars were similar but not all the same. The Arabic numerals may be used for both calendar dates in modern Japanese and Korean languages, but not for Chinese old-style dates.


Japan started using the Gregorian calendar on 1 January 1873,[28] locally known as "the first day of the first month of Meiji 6" (明治6年1月1日 Meiji rokunen ichigatsu tsuitachi). The preceding day, 31 December 1872, was "the second day of the twelfth month of Meiji 5" (明治5年12月2日 Meiji gonen jūnigatsu futsuka).

Japan currently uses two eras: the western era and a modified traditional Japanese era name (nengō). The months and days are those of the Gregorian calendar, but the year is either the western year number or a year of the nengō of the emperor on the throne. Since 1873, an era and the first year of that era has begun on the day of the year that the emperor ascended the throne. The second year of that era began on the next 1 January even if the first year contained only a few days. All subsequent years of that era began on 1 January until that emperor died. For example, the first year of the Showa Era, that of Emperor Hirohito, contained only the last six days of 1926, while Showa 64, his last year, contained only the first seven days of 1989. The current Gregorian year 2019 corresponds to Heisei 31.


Korea started using the Gregorian calendar on 1 January 1896, which was the 17th day of the 11th lunar month not only in Korea but also in China, which still used the lunisolar calendar.[29] The lunisolar Korean calendar is now used for very limited unofficial purposes only. The North Korean calendar uses Gregorian months and days, but with Kim Il-Sung's year of birth (1912) used as year 1.


The Republic of China government under Provisional President Sun Yat-sen abolished the lunisolar Chinese calendar and adopted the Gregorian calendar on 1 January 1912. The public, however, resisted the change and continued to observe traditional holidays. President Yuan Shikai switched to a dual-calendar policy, under which the Gregorian calendar was to be used for most purposes except traditional holidays, which were to be timed according to the Chinese calendar, including the short-lived Empire of China.[b] When the communists took over China in the late 1940s they kept this two-calendar system for the People's Republic of China. Today mainland China (including Hong Kong and Macau), Taiwan, Malaysia, Indonesia and Singapore all observe traditional holidays based on the traditional calendar, such as Lunar New Year, while timing other holidays, especially national anniversaries, according to the Gregorian calendar.

To visually distinguish old and new style dates, writing new style dates with Arabic numerals but old style dates with Chinese characters is the standard in Chinese publications.[30]

In Taiwan it is common to see Arabic numerals in new style dates, though Chinese characters sometimes appear in these.[c] Chinese characters are normally used for old style dates, but Arabic numerals may still be seen. The calendar year in Taiwan used officially is determined according to the traditional custom of era names, but using the founding of the Republic of China government in 1912 as the start rather than the regnal year of an emperor.

The adopted calendar in both mainland China and Taiwan are called the Public Calendar (simplified Chinese: 公历; traditional Chinese: 公曆; pinyin: Gōnglì), or "New Calendar" (simplified Chinese: 新历; traditional Chinese: 新曆; pinyin: Xīnlì).

Months in Gregorian calendar in Chinese are rarely named, instead they are usually numbered. For instance, Gregorian calendar December in China are usually written as month 12. On the other hand, in Chinese calendar, the 11th month and 12th month are usually nicknamed.

Orally, people are accustomed to call the date in the month as "No. dd", for example, the Spring Festival of this year (2017) is No. 28 of Month 1 (simplified Chinese: 1月28号; traditional Chinese: 1月28號) On the other hand, people never call dates on the Chinese calendar as "No. dd"., which avoids any possible ambiguity.

When referencing dates before the introduction of the Gregorian calendar in 1582, the official Chinese calendar may either inherit the issues with earlier calendars to be historically correct[d] or follow the proleptic Gregorian calendar if so specified.[e]

Islamic calendar

The Islamic calendar is a lunar one, so that there are twelve lunar months in a year of 354 or 355 days, being 11 days shorter than a solar year. Consequently, holy days in Islam migrate around the solar year on a 32-year cycle.[31] Some countries in the Islamic world use the Gregorian calendar for civil purposes, while retaining the Islamic calendar for religious purposes. For example, Saudi Arabia adopted the Gregorian calendar as its civil calendar at the end of 2016.[31]

Present situation

Today, the vast majority of countries use the Gregorian calendar as their sole civil calendar. Countries which have not adopted the Gregorian calendar are Ethiopia (Ethiopian calendar),[32] Iran and Afghanistan (Solar Hijri calendar).[33]

Some countries use other calendars alongside the Gregorian calendar, including India (Indian national calendar), Bangladesh (Bengali calendar), Nepal (Vikram Samvat), Pakistan (Islamic calendar), Israel (Hebrew calendar) and Myanmar (Burmese calendar), and other countries use a modified version of the Gregorian calendar, including Thailand (Thai solar calendar), Japan (Japanese calendar), North Korea (North Korean calendar) and Taiwan (Minguo calendar).

While many religious organizations reckon their liturgical year by the Gregorian civil calendar, others have retained their own calendars. Alternative calendars are used in many regions of the world today to mark cycles of religious and astrological events.

Possible date conflicts

Use of different calendars had potential to cause confusion between contemporaries. For example, it is related[34] that one of the contributory factors for Napoleon's victory at the Battle of Austerlitz was the confusion between the Russians, who were using the Julian calendar, and the Austrians, who were using the Gregorian calendar, over the date that their forces should combine.[35] However, this tale is not supported in a contemporary account from a major-general of the Austrian Imperial and Royal Army, Karl Wilhelm von Stutterheim, who tells of a joint advance of the Russian and Austrian forces (in which he himself took part) five days before the battle,[36] and it is explicitly rejected in Goetz's 2005 book-length study of the battle.[37]


The date when each country adopted the Gregorian calendar, or an equivalent, is marked against a horizontal time line. The vertical axis is used for expansion to show separate national names for ease in charting, but otherwise has no significance.


  1. ^ See discussion and references at Rumi calendar.
  2. ^ The Government Gazette of the Empire of China would be dated in Gregorian calendar in the first year of Hongxian, i.e. 1916.
  3. ^ For instance, the Central Weather Bureau used to issue lunisolar calendars in Chinese characters through 2008, but Arabic numerals since 2009.
  4. ^ The 2000-year converter of Chinese and Western calendars by the Academia Sinica in Taiwan uses the Julian calendar from AD 1 to 4 October 1582 and allows users to customize the date of changing over from Julian to Gregorian calendar to suit specific needs. It uses Arabic numerals for both new and old style dates to ease programming, and considers AD 4 a common year to correct the leap year error.
  5. ^ Simpler computer programming may just treat 1 January 1 as Monday as in the proleptic Gregorian calendar, though historically incorrect.


  1. ^ Introduction to Calendars. United States Naval Observatory. Retrieved 15 January 2009.
  2. ^ Calendars Archived 1 April 2004 at the Wayback Machine by L. E. Doggett. Section 2.
  3. ^ The international standard for the representation of dates and times, ISO 8601, uses the Gregorian calendar. Section 3.2.1.
  4. ^ Kamen, Henry (1998). Philip of Spain. Yale University Press. p. 248.
  5. ^ "Pragmatica" on the Ten Days of the Year World Digital Library, the first known South American imprint, produced in 1584 by Antonio Ricardo, of a four-page edict issued by King Philip II of Spain in 1582, decreeing the change from the Julian to the Gregorian calendar.
  6. ^ Nørby, Toke (29 February 2000). "The Perpetual Calendar: What about France?". Retrieved 15 June 2018.
  7. ^ Fruin (1934), p. 10.
  8. ^ AB, Hellmut Gutzwiller /. "Calendriers". HLS-DHS-DSS.CH.
  9. ^ Moyer (1982).
  10. ^ F. J. Baumgartner, "Popes, astrologers and Early modern calendar reform", in History Has Many Voices, Edited by Lee Palmer Wandel, Truman State University Press (2003), p. 53.
  11. ^ Morgan, Hiram (1 April 2006). "'The Pope's new invention': the introduction of the Gregorian calendar in Ireland, 1583–1782". Pontifical Irish College, Rome: "Ireland, Rome and the Holy See: History, Culture and Contact", a UCC History Department symposium. Archived from the original (MS Word) on 19 July 2011. Retrieved 17 October 2010.
  12. ^ a b Nørby, Toke. The Perpetual Calendar
  13. ^ Lamont, R (1920). "The Reform of the Julian Calendar". Popular Astronomy. 28 (6): 22.
  14. ^ Fruin (1934), pp. 10-11.
  15. ^ Mike Spathaky Old Style and New Style Dates and the change to the Gregorian Calendar: A summary for genealogists
  16. ^ 24 Geo. II Ch. 23, § 3.
  17. ^ Sumner 1875, p. 348
  18. ^ See "Закон за въвеждане на Грегориянския календар [Law on Introduction of the Gregorian Calendar]", Държавен вестник [Durzhaven Vestnik (State Gazette)], XXXVII, Sofia, 21 March 1916.
  19. ^ "Russia: The October (November) Revolution". Encyclopædia Britannica Online. 2007. Retrieved 18 March 2007.
  20. ^ Theodossiou, E. Th.; Manimanis, V. N.; Mantarakis, P. (2007). "Demetrios Eginitis: Restorer of the Athens Observatory". Journal of Astronomical History and Heritage. 10 (2): 123–132. Bibcode:2007JAHH...10..123T.
  21. ^ Barnaba Oriani, De usu fractionum continuarum ad inveniendos Ciclos Calendarii novi et veteris, Ephemerides Astronomicae Anni 1786, Mediolani 1785, pp 132 - 154.
  22. ^ Barsoum (2003)
  23. ^ The Armenian Church | Christmas (c. 2010). Diocese of the Armenian Church of America (Eastern).
  24. ^ Ardem A. Tajerian (n.d.). When Is Easter This Year? Archived 11 March 2012 at the Wayback Machine CAKE Foundation. Retrieved 7 January 2009.
  25. ^ "About Japanese Vocabulary - Calendar". Retrieved 23 April 2014.
  26. ^ Lee (1996), p. 341.
  27. ^ Lee (1996), p. 382 and p. 520 (note 13).
  28. ^ a b "The Japanese Calendar History". National Diet Library, Japan. 2002. Archived from the original on 3 December 2002. Retrieved 19 March 2007.
  29. ^ a b Andrei Lankov (6 February 2005). "The Dawn of Modern Korea (266) Lunar Calendar". The Korea Times. Archived from the original on 17 December 2005. Retrieved 27 August 2017.
  30. ^ GB/T 15835-1995, General rules for writing numerals in publications, Section 5
  31. ^ a b The prince’s time machine: Saudi Arabia adopts the Gregorian calendar The Economist, 17 December 2016
  32. ^ "The Ethiopian Calendar", Appendix IV, C.F. Beckingham and G.W.B. Huntingford, The Prester John of the Indies (Cambridge: Hakluyt Society, 1961)
  33. ^ M. Heydari-Malayeri, A concise review of the Iranian calendar, Paris Observatory.
  34. ^ Lord Robertson (2000). "Prospects for NATO–Russian relations" (.pdf). p. 1, para. 1. NATO. Retrieved 19 March 2007.
  35. ^ Chandler, David G (1 March 1973). "From the Rhine to the Danube". The Campaigns of Napoleon. New York: Scribner. p. 383. ISBN 0-02-523660-1.
  36. ^ Stutterheim, Karl; Pine-Coffin, John (trans.) (1807). A Detailed Account of The Battle of Austerlitz. London: Goddard. p. 44.
  37. ^ Robert Goetz, 1805: Austerlitz: Napoleon and the Destruction of the Third Coalition (Greenhill Books, 2005).

Works cited

  • Barsoum, I. A., & Moosa, M. (2003). The scattered pearls : a history of Syriac literature and sciences / by Ignatius Aphram I Barsoum ; translated and edited by Matti Moosa ; with a foreword by Cyril Aphrem Karim. Gorgias Press.
  • Fruin, R. (1934), Handboek der Chronologie, voornamelijk van Nederland. Alphen a/d Rijn: N. Samson.
  • Lee, Peter H. (Ed.) (1996). Sourcebook of Korean Civilization: Vol.2: From the seventeenth century to the modern period. Columbia University Press. ISBN 0-231-07914-1.
  • Lee, P.H. & de Bary, W. T. (Eds., with Yongho Ch'oe & Kang, H. H. W.) (2000). Sources of Korean Tradition, (Vol. 2). New York: Columbia University Press.
  • Sumner, Charles. (1875). The cession of Russian America to the United States in The Works of Charles Sumner, vol. 11. Boston: Lea and Shepard.

External links

1752 in Great Britain

Events from the year 1752 in Great Britain.

1752 in Ireland

Events from the year 1752 in Ireland.

Aloysius Lilius

Aloysius Lilius (c. 1510 – 1576), also variously referred to as Luigi Lilio, Luigi Giglio, was an Italian doctor, astronomer, philosopher and chronologist, and also the "primary author" who provided the proposal that (after modifications) became the basis of the Gregorian Calendar reform of 1582.The crater Lilius on the Moon is named after him, as is the asteroid 2346 Lilio. In computer science, the Lilian date is the number of days since the adoption of the Gregorian calendar on 15 October 1582.

Battle of Nibley Green

The Battle of Nibley Green was fought on 20 March 1469 (modern historians would date the battle in 1470 - prior to the adoption of the Gregorian calendar in England the start of the new year was 25 March; the battle being fought on 20 March meant it fell into the previous year), between the troops of Thomas Talbot, 2nd Viscount Lisle and William Berkeley, 2nd Baron Berkeley. It is notable for being the last battle fought in England entirely between the private armies of feudal magnates.

Berber calendar

The Berber calendar is the agricultural calendar traditionally used by Berbers. It is also known as the fellaḥi (ﻓﻼّﺣﻲ "rustic" or ﻋﺠﻤﻲ ʿajamī "foreign" calendar). The calendar is utilized to regulate the seasonal agricultural works.

The Islamic calendar, a lunar calendar, is not suited for agriculture because it does not relate to seasonal cycles. In other parts of the Islamic world either Iranian solar calendars, the Coptic calendar, the Rumi calendar, or other calendars based on the Julian calendar, were used before the introduction of the Gregorian calendar.The current Berber calendar is a legacy of the Roman province of Mauretania Caesariensis and the Roman province of Africa, as it is a surviving form of the Julian calendar. The latter calendar was used in Europe before the adoption of the Gregorian calendar, with month names derived from Latin. Berber populations previously used various indigenous calendars, such as that of the Guanche autochthones of the Canary Islands. However, relatively little is known of these ancient calendrical systems.

Century leap year

In the Gregorian calendar, a year ending in "00" that is divisible by 400 is a century leap year, with the intercalation of February 29 yielding 366 days instead of 365. Century years (divisible by 100) that are not divisible by 400 are not leap years but common years of 365 days. For example, the years 1600, 2000, and 2400 are century leap years since those numbers are divisible by 400, while 1700, 1800, 1900, 2100, 2200, and 2300 are common years despite being divisible by 4. Leap years divisible by 400 always start on a Saturday; thus the leap day February 29 in those years always falls on a Tuesday (dominical letter BA).

The Gregorian calendar yields an average year that currently tracks the annual revolution period of the Earth more closely than the older Julian calendar, in which every fourth year (including end-of-century years) is a leap year. The Julian formula adds too many leap days (3 every 400 years), causing the Julian calendar to drift gradually with respect to the astronomical seasons. Over time, natural events such as the spring equinox began to occur earlier and earlier in the Julian calendar.

The Gregorian calendar was introduced in 1582, but was adopted by various countries over several centuries, with the result that some countries still used the older Julian calendar while others used the Gregorian calendar. Dates prior to 1582 are generally calculated using the Julian calendar, and different countries have different conventions about dates between 1582 and their adoption of the Gregorian calendar. (See, for example, Old Style and New Style dates.)


Circa (from Latin, meaning 'around, about') – frequently abbreviated c., ca. or ca and less frequently circ. or cca. – signifies "approximately" in several European languages and as a loanword in English, usually in reference to a date. Circa is widely used in historical writing when the dates of events are not accurately known.

When used in date ranges, circa is applied before each approximate date, while dates without circa immediately preceding them are generally assumed to be known with certainty.


1732–1799: Both years are known precisely.

c. 1732 – 1799: The beginning year is approximate; the end year is known precisely.

1732 – c. 1799: The beginning year is known precisely ; the end year is approximate.

c. 1732 – c. 1799: Both years are approximate.


Date or dates may refer to:

Date (fruit), the fruit of the date palm (Phoenix dactylifera)

Era (geology)

A geologic era is a subdivision of geologic time that divides an eon into smaller units of time. The Phanerozoic Eon is divided into three such time frames: the Paleozoic, Mesozoic, and Cenozoic (meaning "old life", "middle life" and "recent life") that represent the major stages in the macroscopic fossil record. These eras are separated by catastrophic extinction boundaries, the P-T boundary between the Paleozoic and the Mesozoic and the K-Pg boundary between the Mesozoic and the Cenozoic. There is evidence that catastrophic meteorite impacts played a role in demarcating the differences between the eras.

The Hadean, Archean and Proterozoic eons were as a whole formerly called the Precambrian. This covered the four billion years of Earth history prior to the appearance of hard-shelled animals. More recently, however, the Archean and Proterozoic eons have been subdivided into eras of their own.

Geologic eras are further subdivided into geologic periods, although the Archean eras have yet to be subdivided in this way.


Floruit (UK: , US: ), abbreviated fl. (or occasionally flor.), Latin for "he/she flourished", denotes a date or period during which a person was known to have been alive or active. In English, the word may also be used as a noun indicating the time when someone flourished.

Gaspar Graziani

Gaspar (or Gaşpar, Gasparo) Graziani (also credited as Grazziani, Gratiani and Graţiani; Kasper Gratiani in Polish; ca. 1575/1580–1620) was Voivode (Prince) of Moldavia between February 4OS/February 14 NS 1619 and September 19 OS/September 29 NS 1620 (see Adoption of the Gregorian calendar).

Geologic Calendar

The Geologic Calendar is a scale in which the geological lifetime of the earth is mapped onto a calendrical year; that is to say, the day one of the earth took place on a geologic January 1 at precisely midnight, and today's date and time is December 31 at midnight. On this calendar, the inferred appearance of the first living single-celled organisms, prokaryotes, occurred on a geologic February 25 around 12:30pm to 1:07pm, dinosaurs first appeared on December 13, the first flower plants on December 22 and the first primates on December 28 at about 9:43pm. The first Anatomically modern humans did not arrive until around 11:48 p.m. on New Year's Eve, and all of human history since the end of the last ice-age occurred in the last 82.2 seconds before midnight of the new year.


Kannazuki (神無月, also Kaminazuki, Kaminashizuki) is a traditional name for the tenth month in the traditional Japanese calendar.

The name can be translated literally as "the month when there are no gods". In Shinto tradition it was said that the eight million gods of Japan left their shrines and congregated annually at Izumo Taisha. There the month was known as Kamiarizuki (神在月), "the month when the gods are present". However, the 無 character, which normally means "absent" or "there is not", is here probably originally used as an ateji, that is used only for the sound "na". In this name the "na" is actually a possessive particle, so Kaminazuki means "month of the gods", not "month without gods" (Kaminakizuki), similarly to Minazuki, the "month of water". However, by false etymology this became commonly interpreted to mean that because in that month, all the Shinto kami gather at Izumo Shrine in Izumo province (modern-day Shimane Prefecture), there are no gods in the rest of the country with the exception of Hiruko, who does not hear the summons and is thus still available for worship. Thus, in Izumo Province, the month is called Kamiarizuki (神有月 or 神在月, "month with gods").

Until 1873, the tenth month of the lunar calendar largely overlapped with the modern month of November. However, after the adoption of the Gregorian calendar in Japan in that year, October became generally accepted as the "godless month".

Kayu ura

Kayu ura 粥占 or Mi kayu ura 神粥占 is a Japanese Shinto divination ritual using rice or bean gruel.

Traditionally, the kayu ura ritual took place on the 15th day of the first lunar month, but since the adoption of the Gregorian calendar it has been conventional to perform the ceremony on January 15th; this date is known as ko-shōgatsu or "Little New Year". Divination by gruel is generally used for agricultural predictions; it is presumed to predict the weather and harvests for the coming year.The ceremony takes various forms. A common practice is to stir a large pot of rice gruel (粥 (kayu)) with a split wooden stick, and to observe the number and organisation of the grains that adhere to the stick when it is removed. In another variation, known as tsutsugayu shinji, multiple hollow cylinders made of split bamboo or reeds are placed in the gruel, each cylinder corresponding to a specific month. Shinto prayers are chanted and the rice porridge is then left overnight. The following morning, the cylinders are cut open and the contents examined – the more rice that has stuck to the inside of the tube, the more propitious the harvest. If multiple tubes are used, these usually correspond to specific months of the year, and the results are recorded on a month-by-month basis. The tsutsugayu shinji variation is practiced at the Suwa Grand Shrine.Whilst rice is usually used, a porridge made from red beans (a symbol of fertility) can be substituted as an alternative.A further variation on the ritual is used in Akita, in which the gruel is not stirred but is instead smeared on a wooden pole; predictions are made based on how much rice sticks to the pole and the patterns that it makes. The oldest form of this ceremony, and the precursor to those listed above, involves a Shinto priest examining the mould that has formed on a bowl of rice porridge that has been stored in a special box for several days.

Lost in September

Lost in September is the second novel by Canadian writer Kathleen Winter, published in 2017.Set in Montreal, the novel centres on Jimmy Blanchard, a mysterious homeless man who believes himself to be the reincarnation of 18th-century British general James Wolfe. Possessed of an encyclopedic knowledge of Wolfe's life, he is particularly obsessed with an 11-day furlough that Wolfe lost in 1752 when the British adoption of the Gregorian calendar resulted in his being summoned back to war earlier than planned, and believes his presence in contemporary Montreal to be a belated restoration of the furlough.The novel was shortlisted for the Governor General's Award for English-language fiction at the 2017 Governor General's Awards.

Old Style and New Style dates

Old Style (O.S.) and New Style (N.S.) are terms sometimes used with dates to indicate that the calendar convention used at the time described is different from that in use at the time the document was being written. There were two calendar changes in Great Britain and its colonies, which may sometimes complicate matters: the first was to change the start of the year from Lady Day (25 March) to 1 January; the second was to discard the Julian calendar in favour of the Gregorian calendar. Closely related is the custom of dual dating, where writers gave two consecutive years to reflect differences in the starting date of the year, or to include both the Julian and Gregorian dates.

Beginning in 1582, the Gregorian calendar replaced the Julian in Roman Catholic countries. This change was implemented subsequently in Protestant and Orthodox countries, usually at much later dates. In England and Wales, Ireland, and the British colonies, the change to the start of the year and the changeover from the Julian calendar occurred in 1752 under the Calendar (New Style) Act 1750. In Scotland, the legal start of the year had already been moved to 1 January (in 1600), but Scotland otherwise continued to use the Julian calendar until 1752. Thus "New Style" can either refer to the start of year adjustment, or to the adoption of the Gregorian calendar.

In Russia, new style dates came into use in early 1918. Other countries in Eastern Orthodoxy adopted new style dating for their civil calendars but most continue to use the Julian calendar for religious use. In English-language histories of other countries (especially Russia), the Anglophone OS/NS convention is often used to identify which calendar is being used when giving a date.

Public holidays in Japan

Public holidays in Japan (国民の祝日, kokumin no shukujitsu) were established by the Public Holiday Law (国民の祝日に関する法律, Kokumin no Shukujitsu ni Kansuru Hōritsu) of 1948 (as amended). A provision of the law establishes that when a national holiday falls on a Sunday, the next working day shall become a public holiday, known as furikae kyūjitsu (振替休日, literally "transfer holiday"). Additionally, any day that falls between two other national holidays shall also become a holiday, known as kokumin no kyūjitsu (国民の休日, literally "citizens' holiday"). May 4, sandwiched between Constitution Memorial Day on May 3 and Children's Day on May 5, was an annual example of such a holiday until it was replaced by Greenery Day in 2007.

Prior to Japan's adoption of the Gregorian calendar in 1873, the dates of holidays were based on the traditional Chinese lunisolar calendar. Thus, New Year's Day, for example, was celebrated at the beginning of spring, as it is in modern China, Korea and Vietnam. Japan has 16 national, government-recognized holidays.

Saint Sylvester's Day

Saint Sylvester's Day, also known as Silvester (also spelled Sylvester, Szilveszter, or Sylwester) or the Feast of Saint Sylvester, is the day of the feast of Pope Sylvester I, a saint who served as Pope of the Western Church from 314 to 335 and is considered by tradition as overseeing both the First Council of Nicaea and Roman Emperor Constantine I's conversion to Christianity. Among the Western Christian Churches, the feast day is held on the anniversary of Saint Sylvester's death, 31 December, a date that, since the adoption of the Gregorian calendar, has coincided with New Year's Eve. For these Christian denominations, Saint Silvester's Day liturgically marks the seventh day of Christmastide. Eastern Orthodox Churches celebrate Sylvester's feast on a different day from the Western Churches, i.e. on 2 January. Saint Sylvester's Day celebrations are marked by church attendance at Midnight Mass or a Watchnight service, as well as fireworks, partying, and feasting.


A stratotype or type section is a geological term that names the physical location or outcrop of a particular reference exposure of a stratigraphic sequence or stratigraphic boundary. If the stratigraphic unit is layered, it is called a stratotype, whereas the standard of reference for unlayered rocks is the type locality.

Key topics
Astronomic time
Geologic time
Genetic methods
Linguistic methods
Related topics

This page is based on a Wikipedia article written by authors (here).
Text is available under the CC BY-SA 3.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.