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The Calendar (New Style) Act 1750 (c.23) (also known as Chesterfield's Act after Philip Stanhope, 4th Earl of Chesterfield) is an Act of the Parliament of Great Britain. It reformed the calendar of England and British Dominions so that a new year began on 1 January rather than 25 March (Lady Day) and would run according to the Gregorian calendar as used in most of western Europe.

The mischief

The Parliament held that the Julian calendar then in use, as well as the start of the year being 25 March was -
"...attended with divers inconveniences, not only as it differs from the usage of neighbouring nations, but also from the legal method of computation in Scotland, and from the common usage throughout the whole kingdom, and thereby frequent mistakes are occasioned in the dates of deeds and other writings, and disputes arise therefrom..."


In England, the 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 in use on the continent, the changes introduced in 1582 by the Gregorian calendar were adopted with effect in 1752. To this end, the calendar was advanced by 11 days: 2 September 1752 was followed by 14 September 1752. The other changes brought about by Gregory were also adopted.


Scotland had already made the change to having the year begin on 1 January in 1600, but only adopted the Gregorian calendar in 1752.

Subsequent events

It has been reported in some history books that a number of the public rioted after the calendar change, requesting that their "eleven days" be returned. However, this is very likely a myth, being based on only two primary sources: The World, a satirical journal of Lord Chesterfield and a painting by William Hogarth.

Chesterfield was behind the Calendar Reform Act of 1750. In one of his letters to his son he writes, "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.

When the son of the Earl of Macclesfield (who had been influential in passing the calendar law) ran for a seat in 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 made 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."

And thus it was that the 'calendar riot' fiction was born. The election campaign depicted was one which concluded in 1754, after a very lengthy contest between Court Whigs and Jacobite Tories. Literally 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 favoritism 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.

There were, however, legitimate concerns about tax payments under the new calendar. Under provision 6 (Times of Payment of Rents, Annuities) of the Act, Great Britain made special provisions to make sure 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".

Several theories have been proposed for the odd beginning of the British financial year on 6 April. One is that from 1753 until 1799, the tax year in Britain continued to operate on the Julian calendar and began on 5 April, which was the "old style" new tax year of 25 March. 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 Kingdommarker still begins 6 April. Poole thought that quarter days, such as Lady Day 25 March, marked the end of the financial quarters of the year. Thus, although 25 March Julian marked the beginning of the civil year, the next day, 26 March Julian was the beginning of the financial year before 1752. After removing eleven days in 1752, this corresponded to 6 April Gregorian, where it remains today. Although Poole's theory is supported by one dictionary, another dictionary as well as other sources state that quarter days mark the beginning of their respective quarters.


  1. Spathaky, Mike Old Style and New Style Dates and the change to the Gregorian Calendar
  2. Robert Poole, "'Give us our eleven days!': calendar reform in eighteenth-century England", Past & Present 149(1) (November 1995) 95–139, section I. See also Duncan Steele, Marking Time, p. 249
  3. HM Revenue & Customs: Frequengly Asked Questions: Why does the tax year start on April 6?, HM Revenue & Customs. Retrieved 2008-12-04
  4. Quarter day - Webster's 1913 dictionary
  5. quarter day - Webster's Third New International Dictionary
  6. Quarter Days -
  7. Quarter day -


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