The Full Wiki

More info on Old Style and New Style dates

Old Style and New Style dates: Map


Wikipedia article:

Map showing all locations mentioned on Wikipedia article:

Old Style (or O.S.) and New Style (or N.S.) are used in English language historical studies either to indicate that the start of the Julian year has been adjusted to start on 1 January (NS) even though contemporary documents use a different start of year (OS); or to indicate that a date conforms to the Julian calendar (OS), formerly in use in many countries, rather than the Gregorian calendar (NS). Death warrant of Charles I web page of the UK National Archives.A demonstration of New Style meaning Julian calendar with a start of year adjustment. The October (November) Revolution Britannica encyclopaedia, A demonstration of New Style meaning the Gregorian calendar. The internationally used Latin cognates of O.S. are stili veteris or stilo vetere, abbreviated st.v. and translating as "(of) old style", and the respective cognates of N.S. are stili novi or stilo novo, abbreviated st.n. and translating as "(of) new style". Like the English speaking countries, other countries may use additional local language congnates like the Germanmarker a.St. ("alten Stils" for O.S.). Also, parts of the Latin abbreviations may be capitalized, e.g. St.n. or St.N. for stili novi.

The Gregorian calendar replaced the Julian in Catholic countries beginning in 1582. This change was also implemented in Protestant and Orthodox countries after a significant delay. In England and Wales, Ireland and the British colonies, the change of the start of the year and the change over from the Julian calendar occurred in 1752 via the Calendar Act 1750. In Scotlandmarker, 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. Many cultures and countries now using the Gregorian calendar have different old styles of dating, depending on the type of calendar they used prior to the change.

Differences between the start of the year

When recording British history it is usual to use the dates recorded at the time of the event with the year adjusted to the start on the 1 January. So for example, the Battle of Hastingsmarker is universally known to have been fought on 14 October, 1066. But the start of the Julian year was not always 1 January and was altered at different times in different countries.

From the 12th century to 1752, the civil or legal year in England began on 25 March (Lady Day) so for example the execution of Charles I was recorded at the time in Parliament as happening on 30 January 1648 (Old Style). In modern English language texts this date is usually recorded as "30 January 1649" (New Style). A full conversion of the date into the Gregorian calendar is 9 February 1649, the date by which his contemporaries in some parts of continental Europe would have recorded his execution.

The OS/NS designation is particularly relevant for dates which fall between the start of the modern year (1 January) and the start of the contemporary year, which was 25 March in England up until 1752 (see Julian year article).

During the transition years between the first introduction of the Gregorian calendar on continental Europe and its introduction in Britain, contemporary usage in England started to change. In Britain 1 January was celebrated as the New Year festival, but the "year starting 25th March was called the Civil or Legal Year, although the phrase Old Style was more commonly used." To reduce misunderstandings on the date, it was normal in parish registers to place a new year heading after 24 March, for example 1661 had another heading at the end of the following December indicating "1661/62". This was to explain to the reader that the year was 1661 Old Style and 1662 New Style.Spathaky, Mike Old Style New Style dates and the change to the Gregorian calendar. "An oblique stroke is by far the most usual indicator, but sometimes the alternative final figures of the year are written above and below a horizontal line, as in a fraction (a form which cannot easily be reproduced here in ASCII text). Very occasionally a hyphen is used, as 1733-34."

Differences between Julian and Gregorian dates

Conversion of Julian to Gregorian dates
Time period (from
1 March of first year to
28 February of last year)

Сorrection, days
1–100 −2
100–200 −1
200–300 0
300–500 +1
500–600 +2
600–700 +3
700–900 +4
900–1000 +5
1000–1100 +6
1100–1300 +7
1300–1400 +8
1400–1500 +9
1500–1700 +10
1700–1800 +11
1800–1900 +12
1900–2100 +13
2100–2200 +14
The Julian calendar was formerly in use in many European countries and their colonies, rather than the Gregorian calendar, currently in use in most countries. Consequently and to avoid ambiguity, "Old Style" (OS) and "New Style" (NS) are sometimes added to historical dates to identify which system is being used (when giving a date in the period when both systems were in parallel use). This notation is used in Western European (and colonial) history: similar notations are in use for the equivalent conversions in Eastern Europe and Asia.

For a period of 170 years (1582–1752), both dating systems were in concurrent use in different parts of Western Europe and its colonies. The Julian calendar had drifted by 11 days from the solar calendar (due to its excess of leap years), so dates differ between the systems. System conversion for secular use occurred in Eastern Orthodox countries as late as the twentieth century, and has still not occurred for ecclesiastic use in some of these countries.

Catholic countries such as Italy, Poland, Spain, and Portugal were first to change to the Gregorian calendar. Thursday, 4 October 1582 was followed by Friday, 15 October 1582, with ten days "missing". Countries that did not change until the 1700s observed an additional leap year, necessitating eleven "missing days". Some countries did not change until the 1800s or 1900s, necessitating one or two more "missing days".

France changed from Julian to Gregorian Calendar on 9 December 1582 (OS) where the next day was 20 December 1582 (NS). France used the French Republican Calendar from 22 September 1792 (NS) to 31 December 1805 (NS).

In Russiamarker, the terms "Old Style" and "New Style" have the same significance as elsewhere. The start of the year was moved to 1 January in 1700, but the Gregorian calendar was introduced there much later, in the nascent Soviet Unionmarker —on 14 February 1918 (Gregorian calendar). Hence the October Revolution of 1917 is so called, despite having started on 7 November under the Gregorian calendar (25 October [Julian 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 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.

It is sometimes remarked that William Shakespeare and Miguel de Cervantes died on the same date, 23 April 1616, but not on the same day. Englandmarker was still using the Julian calendar in 1616, while Spainmarker was using the Gregorian calendar. Cervantes actually died ten days before Shakespeare.

Possible date conflicts

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 Austerlitzmarker 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 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 recent book-length study of the battle.

Usually, the mapping of new dates onto old dates with a start of year adjustment works well with little confusion for events which happened before the introduction of the Gregorian Calendar. For example the Battle of Agincourtmarker is universally known to have been fought on 25 October 1415, which is Saint Crispin's Day. But for the period between the first introduction of the Gregorian calendar on 15 October 1582 and its introduction in Britain on 14 September 1752, there can be considerable confusion between events in continental western Europe and in British domains. Events in continental western Europe are usually reported in English language histories as happening under the Gregorian calendar. For example the Battle of Blenheimmarker is always given as 13 August 1704. However confusion occurs when an event affects both. For example William III of England arrived at Brixhammarker in England on 5 November (Julian calendar), after setting sail from the Netherlandsmarker on 11 November (Gregorian calendar).

The Battle of the Boyne took place only a few months later in Ireland on 1 July 1690 "Old Style". However, it is commemorated as taking place on 12 July "New Style" by the Orange parades on "The Twelfth", possibly because of Protestant Orangemen's antipathy to Papal innovations and because it is in part a conflation of commemorations of the Battle of Aughrimmarker, 12 July (OS) 1691.

Because of the differences, English people and their correspondents often employed two dates, dual dating, more or less automatically, as Benjamin Woolley observed in his biography of Dr John Dee, The Queen's Conjurer. Dee fought unsuccessfully for England to embrace the 1583/4 date set for the change. Woolley wrote because of "the decision, England remained outside the Gregorian system for a further 170 years, communications during that period customarily carrying two dates, one 'OS' or Old Style, the other 'NS' or New Style." Thomas Jefferson, for example, lived during the time Great Britain, Ireland and the British colonies eventually converted to the Gregorian calendar, so he instructed that his tombstone bear his dates of birth and death in the Old Style and New Style, respectively. At Jefferson's birth the difference would have been eleven days between styles, had the New Style been converted to yet, as is evidenced by his "original" birthday of 2 April and his New Style birthday of 13 April.

Countries that used lunisolar calendars

Japan, Koreamarker, and Chinamarker 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 Chinese.


Japan started using the Gregorian calendar on 1 January 1873, locally known as . The preceding day, 31 December 1872, was .

Japan currently employs two calendar systems: Gregorian and modified traditional nengō. Specifically, the months and days now correspond to those of the Gregorian calendar, but the year is expressed as an offset of the era. For example, the Gregorian year 2008 corresponds to Heisei 20. An era does not necessarily begin on 1 January.


Korea started using the Gregorian calendar on 1 January 1896, which was the 17th day of the 11th lunar month in not only Korea but also in Chinamarker that still used the lunisolar calendar. The lunisolar Korean calendar is now used in very limited unofficial purposes only.


The Republic of Chinamarker started using the Gregorian calendar on 1 January 1912, but the lunisolar Chinese calendar is still used along with the Gregorian calendar, especially when determining certain traditional holidays. The reference has been a longitude of 120°E since 1929, which is also used for China standard time (UTC+8). China, Hong Kongmarker, Macaumarker, Malaysiamarker, Indonesiamarker, Singaporemarker and Taiwanmarker all have legal holidays based on the lunisolar Chinese calendar, with the most important one being the Chinese New Year.

To visually distinguish old and new style dates, GB/T 15835-1995, General rules for writing numerals in publications, which is a national standard of the People's Republic of China, requires writing new style dates with Arabic numerals but old style dates with Chinese characters, never Arabic numerals.

In Taiwan, even though new style dates are written in Chinese characters in very formal texts, it is now common to see Arabic numerals in new style dates in less formal texts. When writing old style dates, Chinese characters are usually used while Arabic numerals are considered very casual and strongly discouraged as in Mainland China. The calendar year in Taiwan is usually expressed as the "Year of the Republic" — counting Year 1 as the foundation of the Republic of China in 1912.

See also

Notes and references

  1. Stockton, J.R. Date Miscellany I: The Old and New Styles "The terms 'Old Style' and 'New Style' are now commonly used for both the 'Start of Year' and 'Leap Year' [(Gregorian calendar)] changes (England & Wales: both in 1752; Scotland: 1600, 1752). I believe that, properly and historically, the 'Styles' really refer only to the 'Start of Year' change (from March 25th to January 1); and that the 'Leap Year' change should be described as the change from Julian to Gregorian."
  2. Spathaky, Mike Old Style New Style dates and the change to the Gregorian calendar. "increasingly parish registers, in addition to a new year heading after 24th March showing, for example '1733', had another heading at the end of the following December indicating '1733/4'. This showed where the New Style 1734 started even though the Old Style 1733 continued until 24th March. ... We as historians have no excuse for creating ambiguity and must keep to the notation described above in one of its forms. It is no good writing simply 20th January 1745, for a reader is left wondering whether we have used the Old or the New Style reckoning. The date should either be written 20th January 1745 OS (if indeed it was Old Style) or as 20th January 1745/6. The hyphen (1745-6) is best avoided as it can be interpreted as indicating a period of time."
  3. Old Style New Style dates and the change to the Gregorian calendar GENUKI - UK and Ireland Geneology
  4. Nørby, Toke. The Perpetual Calendar: What about England Version 29 February 2000
  5. Tuesday 31 December 1661, Pepys Diary "I sat down to end my journell for this year, ..."
  6. A Julian leap year is every year divisible by 4. A Gregorian leap year is a year exactly divisible by 4 but not by 100 unless it is exactly divisible by 400. So 400, 800, 1200, 1600 and 2000 were leap years under both calendars, but the other centuries (e.g. 1700, 1800, 1900) were leap years under the Julian calendar but not the Gregorian calendar.
  7. Today in Literature
  8. Robert Goetz, 1805: Austerlitz: Napoleon and the Destruction of the Third Coalition (Greenhill Books, 2005)
  9. John Baker. Why Bacon, Oxford and Other's Weren't Shakespeare use this quote by Benjamin Woolley and cites The Queen's Conjurer, The Science and Magic of Dr. John Dee, Adviser to Queen Elizabeth I, page 173.
  10. BAD LINK! 404 error

Further reading

Embed code:

Got something to say? Make a comment.
Your name
Your email address