Through enactment of the "Calendar (New Style) Act 1750, "Great Britain and the "British Empire (including the eastern part 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.
With the same Act, the Empire (except Scotland, which had already done so from 1600) changed the start of the civil year to the 1st of January (from 5 April). 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.
The European colonies of "the Americas adopted the change when their mother countries did. In "Alaska, the change took place after the United States "purchased Alaska from Russia. Friday, 6 October 1867 was 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.
Although Roman Catholic countries such as the "Polish–Lithuanian Commonwealth adopted the "new style" (N.S.) Gregorian calendar in 1582, 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. Many of the countries of "Eastern Europe were officially "Eastern Orthodox or "Islamic and adopted the Gregorian calendar much later than "Western Christian countries.
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.
The "Ottoman Empire's "Rumi calendar, used for civil purposes, was realigned from a Julian to a Gregorian starting on 1 March 1917. The "Islamic calendar remained the official calendar until 1927, when it was replaced by the Gregorian calendar. The beginning of the year was reset to 1 January starting in 1918. Year numbering, however, remained uniquely Turkish until the Gregorian calendar was introduced for general purposes in 1926.[c]
In "Russia the Gregorian calendar was accepted after the "October Revolution (so named because it took place in October 1917 in the Julian calendar). 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. 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.
Other countries of Eastern Europe, most notably "Eastern Orthodox countries, adopted the Gregorian calendar in the 1910s or early 1920s. 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. 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.)
While the civil administrations of Eastern European countries adopted the Gregorian calendar in the 1910s or early 1920s, none of the national "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 Constantinoplewhich dropped 13 days in 1923 (though no churches adopted it until 1924) and adopted a different leap year rule. 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. The "Indian Orthodox Church uses the Gregorian calendar along with their autonomous Syriac Orthodox counterparts in India, the "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.
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.) 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, "Taisho 1 for 1912, "Showa 1 for 1926, "Heisei 1 or 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.["citation needed]
Korea adopted the Gregorian calendar on 1 January 1895 with the active participation of "Yu Kil-chun. 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; 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.["citation needed]
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.
"Japan, "Korea, and China started using the Gregorian calendar on 1 January 1873, 1896, and 1912, respectively. 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, 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 2017 corresponds to "Heisei 29.
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. 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. When the communists took over China in the late 1940s they kept this two-calendar system for the People's Republic of China. Today China, Hong Kong, "Macau, Malaysia, Indonesia, Singapore and Taiwan 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.
In China national guidelines ("GB/T 15835-1995, General rules for writing numerals in publications) require writing new style dates with Arabic numerals but old-style dates with "Chinese characters. The use of Arabic numerals is considered overly casual for old-style dates.
In Taiwan it is common to see Arabic numerals in new-style dates, though Chinese characters sometimes appear in these. Chinese characters are normally used for old style dates. 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".
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 follows the "proleptic Gregorian calendar, so as not to inherit the issues with earlier calendars.
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. Some Islamic states use the Gregorian calendar (as the "Common Era calendar) for civil purposes, while retaining the Islamic calendar for religious purposes.
"Saudi Arabia adopted the Gregorian calendar as its civil calendar at the end of 2016.
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Today, the vast majority of countries use the Gregorian calendar as their sole civil calendar. Countries which have not adopted the Gregorian calendar include Ethiopia ("Ethiopian calendar), and Iran and Afghanistan ("Persian calendar). 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 Burma ("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.
Occasionally using different calendars has caused confusion between contemporaries. For example, it is related 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. However, this tale is not supported in a contemporary account from a major-general of the Austrian Imperial and Royal Army, who tells of a joint advance of the Russian and Austrian forces (in which he himself took part) five days before the battle, and it is explicitly rejected in Goetz's 2005 book-length study of the battle.
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.