Old Style and New Style dates
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Old Style (O.S.) and New Style (N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the
Julian calendar The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts ...
to the
Gregorian calendar The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian cale ...
as enacted in various European countries between 1582 and 1923. In
England England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...
,
Wales Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...
,
Ireland Ireland (, ; ; Ulster Scots dialect, Ulster-Scots: ) is an island in the North Atlantic Ocean, in Northwestern Europe. Geopolitically, the island is divided between the Republic of Ireland (officially Names of the Irish state, named Irelan ...
and Britain's American colonies, there were two calendar changes, both in 1752. The first adjusted the start of a new year from 25 March (
Lady Day In the Western liturgical year, Lady Day is the common name in some English-speaking and Scandinavian countries of the Feast of the Annunciation, celebrated on 25 March to commemorate the annunciation of the archangel Gabriel to the Virgin Mar ...
, the
Feast of the Annunciation The Feast of the Annunciation () commemorates the visit of the archangel Gabriel to the Virgin Mary, during which he informed her that she would be the mother of Jesus Christ, the Son of God. It is celebrated on 25 March; however, if 25 Marc ...
) to 1 January, a change which
Scotland Scotland is a Countries of the United Kingdom, country that is part of the United Kingdom. It contains nearly one-third of the United Kingdom's land area, consisting of the northern part of the island of Great Britain and more than 790 adjac ...
had made in 1600. The second discarded the Julian calendar in favour of the Gregorian calendar, skipping 11 days in the month of September to do so.. "Before 1752, 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 Historical Year 1734 started even though the Civil Year 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 Civil or the Historical Year. 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." To accommodate the two calendar changes, writers used
dual dating Dual dating is the practice, in historical materials, of indicating a date with what appear to be duplicate or excessive digits: these may be separated by a hyphen or a slash, or placed one above the other. The need for dual dating arose from th ...
to identify a given day by giving its date according to both styles of dating. For countries such as
Russia Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders ...
where no start-of-year adjustment took place, O.S. and N.S. simply indicate the Julian and Gregorian dating systems respectively.


Differences between Julian and Gregorian dates

The need to correct the calendar arose from the realisation that the correct figure for the number of days in a year is not 365.25 (365 days 6 hours) as assumed by the Julian calendar but slightly less (c. 365.242 days). The Julian calendar therefore has too many
leap year A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) compared to a common year. The 366th day (or 13th month) is added to keep t ...
s. The consequence was that the basis for the calculation of the date of Easter, as decided in the 4th century, had drifted from
reality Reality is the sum or aggregate of everything in existence; everything that is not imagination, imaginary. Different Culture, cultures and Academic discipline, academic disciplines conceptualize it in various ways. Philosophical questions abo ...
. The Gregorian calendar reform also dealt with the accumulated difference between these figures, between the years 325 and 1582, by skipping 10 days to set the ecclesiastical date of the equinox to be 21 March, the median date of its occurrence at the time of the First Council of Nicea in 325. Countries that adopted the Gregorian calendar after 1699 needed to skip an additional day for each subsequent new century that the Julian calendar had added since then. When the British Empire did so in 1752, the gap had grown to eleven days; when Russia did so (as its civil calendar) in 1918, thirteen days needed to be skipped.


Britain and its colonies or possessions

In the
Kingdom of Great Britain Great Britain, also known as the Kingdom of Great Britain, was a sovereign state in Western Europe from 1707 to the end of 1800. The state was created by the 1706 Treaty of Union and ratified by the Acts of Union 1707, which united the Kingd ...
and its possessions, the Calendar (New Style) Act 1750 introduced two concurrent changes to the calendar. The first, which applied to England, Wales, Ireland and the British colonies, changed the start of the year from 25 March to 1 January, with effect from "the day after 31 December 1751". (Scotland had already made this aspect of the changes, on 1 January 1600.) The second (in effect) adopted the Gregorian calendar in place of the Julian calendar. Thus "New Style" can refer to the start-of-year adjustment, to the adoption of the Gregorian calendar, or to the combination of the two. It was through their use in the Calendar Act 1750 that the notations "Old Style" and "New Style" came into common usage.


Start-of-year adjustment

When recording British history, it is usual to quote the date as originally recorded at the time of the event, but with the year number adjusted to start on 1 January.e.g. The latter adjustment may be needed because the start of the civil calendar year had not always been 1 January and was altered at different times in different countries. From 1155 to 1752, the civil or legal year in England began on 25 March (
Lady Day In the Western liturgical year, Lady Day is the common name in some English-speaking and Scandinavian countries of the Feast of the Annunciation, celebrated on 25 March to commemorate the annunciation of the archangel Gabriel to the Virgin Mar ...
); so for example, the execution of Charles I was recorded at the time in Parliament as happening on 30 January 1648 (Old Style). In newer English-language texts, this date is usually shown as "30 January 1649" (New Style).Death warrant of Charles I
web page of th
UK National Archives
A demonstration of New Style, meaning Julian calendar with a start of year adjustment.
The corresponding date in 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 O.S./N.S. designation is particularly relevant for dates which fall between the start of the "historical year" (1 January) and the legal start date, where different. This was 25 March in England, Wales, Ireland and the colonies until 1752, and until 1600 in Scotland. In Britain, 1 January was celebrated as the New Year festival from as early as the 13th century, despite the recorded (civil) year not incrementing until 25 March, 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 about the date, it was normal even in semi-official documents such as parish registers to place a statutory new-year heading after 24 March (for example "1661") and another heading from the end of the following December, ''1661/62'', a form of
dual dating Dual dating is the practice, in historical materials, of indicating a date with what appear to be duplicate or excessive digits: these may be separated by a hyphen or a slash, or placed one above the other. The need for dual dating arose from th ...
to indicate that in the following twelve weeks or so, the year was 1661 Old Style but 1662 New Style.Spathaky, Mik
Old Style and 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, thus: 17\tfrac. Very occasionally a hyphen is used, as ."
Some more modern sources, often more academic ones (e.g. the
History of Parliament The History of Parliament is a project to write a complete history of the United Kingdom Parliament and its predecessors, the Parliament of Great Britain and the Parliament of England. The history will principally consist of a prosopography, in ...
) also use the ''1661/62'' style for the period between 1 January and 24 March for years before the introduction of the New Style calendar in England.


Other notations


Russia

The Gregorian calendar was implemented in Russia on by dropping the Julian dates of , pursuant to a Sovnarkom decree signed (Julian) by
Vladimir Lenin Vladimir Ilyich Ulyanov ( 187021 January 1924), better known as Vladimir Lenin, was a Russian revolutionary, politician and political theorist. He was the first head of government of Soviet Russia from 1917 until Death and state funeral of ...
. The decree required that the Julian date was to be written in parentheses after the Gregorian date, until It is common in English-language publications to use the familiar Old Style or New Style terms to discuss events and personalities in other countries, especially with reference to the
Russian Empire The Russian Empire was an empire that spanned most of northern Eurasia from its establishment in November 1721 until the proclamation of the Russian Republic in September 1917. At its height in the late 19th century, it covered about , roughl ...
and the very beginning of Soviet Russia. For example, in the article "The October (November) Revolution", the ''
Encyclopædia Britannica The is a general knowledge, general-knowledge English-language encyclopaedia. It has been published by Encyclopædia Britannica, Inc. since 1768, although the company has changed ownership seven times. The 2010 version of the 15th edition, ...
'' uses the format of "25 October (7 November, New Style)" to describe the date of the start of the revolution.


Latin notation: st.v. and st.n.

The Latin equivalents, which are used in many languages, are, on the one hand, ''stili veteris'' (genitive) or ''stilo vetere'' (ablative), abbreviated ''st.v.'', and meaning ; and, on the other, ''stili novi'' or ''stilo novo'', abbreviated ''st.n.'' and meaning The Latin abbreviations may be capitalised differently by different users, e.g., ''St.n.'' or ''St.N.'' for ''stili novi''. There are equivalents for these terms in other languages as well, such as the German ''a.St.'' ("''alter Stil''" for O.S.).


Transposition of historical event dates and possible date conflicts

Usually, the mapping of New Style dates onto Old Style dates with a start-of-year adjustment works well with little confusion for events before the introduction of the Gregorian calendar. For example, the
Battle of Agincourt The Battle of Agincourt ( ; ) was an English victory in the Hundred Years' War. It took place on 25 October 1415 (Saint Crispin's Day) near Azincourt, in northern France. The unexpected victory of the vastly outnumbered English troops agains ...
is well known to have been fought on 25 October 1415, which is Saint Crispin's Day. However, 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 by using the Gregorian calendar. For example, the Battle of Blenheim is always given as 13 August 1704. However, confusion occurs when an event involves both. For example,
William III of England William III (William Henry; ; 4 November 1650 – 8 March 1702), also known as William of Orange, was the sovereign Prince of Orange from birth, Stadtholder of County of Holland, Holland, County of Zeeland, Zeeland, Lordship of Utrecht, Utrec ...
arrived at
Brixham Brixham is a coastal town and civil parish in the borough of Torbay in the county of Devon, in the south-west of England. As of the 2021 census, Brixham had a population of 16,825. It is one of the main three centres of the borough, along with ...
in England on 5 November (Julian calendar), after he had set sail from the Netherlands on 11 November (Gregorian calendar) 1688.. The Battle of the Boyne in Ireland took place a few months later on 1 July 1690 (Julian calendar). That maps to 11 July (Gregorian calendar), conveniently close to the Julian date of the subsequent (and more decisive)
Battle of Aughrim The Battle of Aughrim () was the decisive battle of the Williamite War in Ireland. It was fought between the largely Irish Army (Kingdom of Ireland), Irish Jacobitism, Jacobite army loyal to James II of England, James II and the forces of Will ...
on 12 July 1691 (Julian). The latter battle was commemorated annually throughout the 18th century on 12 July, following the usual historical convention of commemorating events of that period within Great Britain and Ireland by mapping the Julian date directly onto the modern Gregorian calendar date (as happens, for example, with
Guy Fawkes Night Guy Fawkes Night, also known as Guy Fawkes Day, Bonfire Night and Fireworks Night, is an annual commemoration list of minor secular observances#November, observed on 5 November, primarily in Great Britain, involving bonfires and firewor ...
on 5 November). The Battle of the Boyne was commemorated with smaller parades on 1 July. However, both events were combined in the late 18th century, and continue to be celebrated as " The Twelfth". Because of the differences, British writers and their correspondents often employed two dates, a practice called
dual dating Dual dating is the practice, in historical materials, of indicating a date with what appear to be duplicate or excessive digits: these may be separated by a hyphen or a slash, or placed one above the other. The need for dual dating arose from th ...
, more or less automatically. Letters concerning diplomacy and international trade thus sometimes bore both Julian and Gregorian dates to prevent confusion. For example, Sir William Boswell wrote to Sir John Coke from
The Hague The Hague ( ) is the capital city of the South Holland province of the Netherlands. With a population of over half a million, it is the third-largest city in the Netherlands. Situated on the west coast facing the North Sea, The Hague is the c ...
a letter dated "12/22 Dec. 1635". In his biography of John Dee, ''The Queen's Conjurer'', Benjamin Woolley surmises that because Dee fought unsuccessfully for England to embrace the 1583/84 date set for the change, "England remained outside the Gregorian system for a further 170 years, communications during that period customarily carrying two dates". In contrast,
Thomas Jefferson Thomas Jefferson (, 1743July 4, 1826) was an American Founding Fathers of the United States, Founding Father and the third president of the United States from 1801 to 1809. He was the primary author of the United States Declaration of Indepe ...
, who lived while the British Isles and colonies converted to the Gregorian calendar, instructed that his tombstone bear his date of birth by using the Julian calendar (notated O.S. for Old Style) and his date of death by using the Gregorian calendar. At Jefferson's birth, the difference was eleven days between the Julian and Gregorian calendars and so his birthday of 2 April in the Julian calendar is 13 April in the Gregorian calendar. Similarly,
George Washington George Washington (, 1799) was a Founding Fathers of the United States, Founding Father and the first president of the United States, serving from 1789 to 1797. As commander of the Continental Army, Washington led Patriot (American Revoluti ...
is now officially reported as having been born on 22 February 1732, rather than on 11 February 1731/32 (Julian calendar). The philosopher
Jeremy Bentham Jeremy Bentham (; 4 February Dual dating, 1747/8 Old Style and New Style dates, O.S. 5 February 1748 Old Style and New Style dates, N.S.– 6 June 1832) was an English philosopher, jurist, and social reformer regarded as the founder of mo ...
, born on 4 February 1747/8 (Julian calendar), in later life celebrated his birthday on 15 February. There is some evidence that the calendar change was not easily accepted. Many British people continued to celebrate their holidays "Old Style" well into the 19th century, a practice that the author Karen Bellenir considered to reveal a deep emotional resistance to calendar reform.


See also

* * Difference between Gregorian and Julian calendar dates (ready-reckoner) * * ("Old Christmas")


Notes


References


Sources

* * * * * *


External links


Untangling Lady Day dating and the Julian Calendar
by Erin Blake (Folger Library)
The Perpetual Calendar
by Toke Nørby - Details of conversion for many countries
Side-by-side Old style–New style reference
by Petko Yotov
Calendar Converter
by John Walker {{DEFAULTSORT:Old Style And New Style Dates Gregorian calendar Julian calendar Time