Calendar (New Style) Act 1750

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Calendar (New Style) Act 1750
Long title An Act for Regulating the Commencement of the Year; and for Correcting the Calendar now in Use
Citation 24 Geo. 2 c. 23
Introduced by Lord Chesterfield
Territorial extent "In and throughout all his Majesty’s dominions and countries in Europe, Asia, Africa, and America"
Territorial extent of (original) subsequent repeals (to (i.e., after) the Anniversary Days Observance Act 1859): England and Wales, Scotland
Commencement 1 January 1752
Other legislation
Amended by Calendar Act 1751, Anniversary Days Observance Act 1859, Statute Law Revision Act 1948, Statute Law (Repeals) Act 1971, Statute Law (Repeals) Act 1986
Status: Spent
Text of statute as originally enacted
Text of the Calendar (New Style) Act 1750 as in force today (including any amendments) within the United Kingdom, from

The Calendar (New Style) Act 1750 (c.23) (also known as Chesterfield's Act after Philip Stanhope, 4th Earl of Chesterfield) was an Act of the Parliament of Great Britain. The Act had two parts: first it reformed the calendar of England[a] and the British Dominions so that the new legal year began on 1 January rather than 25 March (Lady Day); and second Great Britain and its Dominions adopted (in effect)[b] the Gregorian calendar , as already used in most of western Europe.

Reasons for change[edit]

The Parliament held that the Julian calendar then in use, and the start of the year on 25 March, were

England and Wales, and Ireland and the British Colonies[edit]

In England and Wales, the legal year 1751 was a short year of 282 days, running from 25 March to 31 December. 1752 began on 1 January. To align the calendar in use in England to that on the continent, the Gregorian calendar was adopted: and the calendar was advanced by 11 days: Wednesday 2 September 1752 was followed by Thursday 14 September 1752.[2] The year 1752 was thus a short year (355 days) as well.

As well as adopting the Gregorian rule for leap years, Pope Gregory's rules for the date of Easter were also adopted. However, with religious strife still on their minds, the British could not bring themselves to adopt the Catholic system explicitly: 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.[3] The algorithm, set out in the Book of Common Prayer as required by the Act, includes calculation of the Golden Number and the Sunday Letter, which (in the Easter section of the Book) were presumed to be already known. The Annexe to the Act includes the definition: "Easter-day (on which the rest depend) is always the first Sunday after the Full Moon, which happens upon, or next after the Twenty-first Day of March. And if the Full Moon happens upon a Sunday, Easter-day is the Sunday after." The Annexe subsequently uses the terms "Paschal Full Moon" and "Ecclesiastical Full Moon", making it clear that they only approximate to the real Full Moon.[4]


Scotland had already partly made the change: its calendar year had begun on 1 January since 1600.[5] The remainder of the act applied equally to Scotland, a part of the Kingdom of Great Britain since the Acts of Union 1707.

Modern citation[edit]

In giving advice to modern genealogists and historians the American genealogist Douglas Richardson stated:

Dates from January 1st through March 25th prior to 1752 should always be double dated, unless you are unable to tell the actual year. The chief reasons why people fail to double date are ignorance, laziness, or computer programs that don't allow for double dating. Granted that it's a pain to double date, but it is a necessary evil.[6]

Thus an example following the "double-dating" (or "dual dating") convention would be to state: "died 20 March 1545/6". This removes all uncertainty as to the exact time of the death.

Reaction and effect[edit]

An Election Entertainment (c. 1755), a painting by William Hogarth, which is the main source for "Give us our Eleven Days".

Some history books say that some people rioted after the calendar change, asking that their "eleven days" be returned. However this is very likely a myth, based on only two primary sources: The World, a satirical journal of Lord Chesterfield; and a painting by William Hogarth.[7]

Chesterfield was behind the Act. He wrote to his son, "Every numerous assembly is a mob, let the individuals who compose it be what they will. Mere sense is never to be talked to a mob; their passions, their sentiments, their senses and their seeming interests alone are to be applied to. Understanding have they collectively none." Here, he was boasting of his skill in having the Bill passed through the Lords; the 'mob' in question was his fellow peers.[citation needed]

When the son of the Earl of Macclesfield (who had been influential in passing the Act) stood for Parliament in Oxfordshire as a Whig in 1754, dissatisfaction with the calendar reform was one of a number of issues raised by his Tory opponents. In 1755, William Hogarth produced a painting (and an engraved print from the painting) loosely based on these elections, entitled An Election Entertainment, which shows a placard carrying the slogan "Give us our Eleven Days" (on floor at lower right). An example of the resulting incorrect history is by Ronald Paulson, author of Hogarth, His Life, Art and Times, who wrote that "...the Oxfordshire people...are specifically rioting, as historically the London crowd did, to preserve the 'Eleven Days' the government stole from them in September 1752 by changing the calendar".[7]

Thus the "calendar riot" fiction was born. The election campaign depicted concluded in 1754, after a very lengthy contest between Court Whigs and Jacobite Tories. Every issue between the two factions was brought up, including the question of calendar reform. The Tories attacked the Whigs for every deviation, including their alleged favouritism towards foreign Jews and the "Popish" calendar. Hogarth's placard, part of a satire on the character of the debate, was not an observation of actual crowd behaviour.[7]

There were, however, legitimate concerns about tax and other payments under the new calendar. Provision 6 (Times of Payment of Rents, Annuities) of the Act stipulated that monthly or yearly payments would not become due until the dates that they originally would have in the Julian calendar, or in the words of the Act "[Times of Payment of Rents, Annuities] at and upon the same respective natural days and times as the same should and ought to have been payable or made or would have happened in case this Act had not been made".[1]

Several theories have been proposed for the odd beginning of the British tax year on 6 April.[8] One is that from 1753 until 1799, the tax year began on 5 April, which corresponded to 25 March Old Style. After the twelfth skipped Julian leap day in 1800, it was changed to 6 April, which still corresponded to 25 March Old Style. However it was not changed when a thirteenth Julian leap day was skipped in 1900, so the tax year in the United Kingdom still begins on 6 April.[9][10] However Poole thought that quarter days, such as Lady Day on 25 March, marked the end of the quarters of the financial year.[11] Thus, although 25 March Old Style marked the beginning of the civil year, the next day, 26 March Old Style was until 1752 the beginning of the tax year. After removing eleven days in 1752, this corresponded to 6 April New Style, where it remains today. Although Poole's theory is supported by one dictionary,[12] the Oxford English Dictionary and another dictionary as well as other sources state that quarter days mark the beginning of their respective quarters.[13][14][15][16]

In Appalachia, some Scots-Irish settlers resisted the changeover mandated by the Calendar Act by continuing to celebrate Christmas on January 6 (N.S.), referring to the day as Old Christmas.[17]


  1. ^ a b Text of the Calendar (New Style) Act 1750 as in force today (including any amendments) within the United Kingdom, from
  2. ^ See Cal (Unix)#Features and the Solaris manual: "An unusual calendar is printed for September 1752. That is the month 11 days were skipped to make up for lack of leap year adjustments".
  3. ^ 24 Geo. II Ch. 23, § 3.
  4. ^ 24 Geo. II Ch. 23, Annexe.
  5. ^ John James Bond, Handy-book of rules and tables, (1875). See footnote on pages xvii–xviii: original text of the Scottish decree.
  6. ^
  7. ^ a b c Poole 1995; Steel 2000, p. 249
  8. ^ HM Revenue & Customs: Frequently Asked Questions: Why does the tax year start on April 6?, HM Revenue & Customs. Retrieved 2008-12-04.
  9. ^ Philip, Alexander (1921). The calendar; its history, structure and improvement. Cambridge: University Press. p. 24. 
  10. ^ Income Tax Act 2007, s. 4(3)
  11. ^ Poole 1995, note 77.
  12. ^ "Quarter day - Webster's 1913 dictionary". Retrieved 2010-09-14. 
  13. ^ Oxford English Dictionary quarter day, n.: "Each of the four days fixed by custom as marking off the quarters of the year, ... the payment of rent and other quarterly charges fall due, ... In England ... the quarter days are traditionally Lady Day (March 25),..."
  14. ^ quarter day - Webster's Third New International Dictionary
  15. ^ "Quarter Days". LandlordZONE. 2006-04-15. Retrieved 2010-09-14. 
  16. ^ "Quarter day". Retrieved 2010-09-14. 
  17. ^ Blair, Tony (2013-12-25). "Appalachians once celebrated 'Old Christmas'". The Mountain Eagle. Whitesburg, Kentucky. Retrieved 2016-12-29. 


Primary sources

Further reading[edit]


  1. ^ Scotland had changed to a 1 January start in 1600.
  2. ^ The Act makes no reference to Gregory, since to do so might imply recognition of Papal primacy. It acknowledges the inconvenience of having a differing system from neighbouring countries and recognises the error in the Julian calendar. It defined a calendar identical to the Gregorian system, from first principles.