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In the Kingdom of Great Britain 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".
The Calendar (New Style) Act 1750 (24 Geo. 2. c. 23), also known as Chesterfield's Act or (in American usage) the British Calendar Act of 1751, is an Act of the Parliament of Great Britain. Its purpose was for Great Britain and the British Empire to adopt the Gregorian calendar (in effect).
Some States adopted as their Common Law the laws of England in 1607, prior to the New Style Calendar Act. [citation needed] United States of America Russian Empire: 1867 6 Oct 18 Oct 11 Alaska adopted the Gregorian calendar on incorporation into the United States, which preceded adoption by Russia.
So events before 1752 in English records often differ from European records, and it is sometimes necessary to refer to both sets of dates using "Old Style" (Julian) and "New Style" (Gregorian) notation, e.g. William of Orange's armada landed in England on 5 November 1688 (OS) or 15 November 1688 (NS) (see Old Style and New Style dates). The ...
England, Ireland and the British colonies changed the start of the year to 1 January in 1752 (so 1751 was a short year with only 282 days). Later in 1752 in September the Gregorian calendar was introduced throughout Britain and the British colonies (see the section Adoption). These two reforms were implemented by the Calendar (New Style) Act 1750.
In 1752, England and its possessions changed the start of the year to 1 January, and also adopted the Gregorian calendar (on 2 September [c]). Thereafter, the terms "Old Style" (OS) and "New Style" (NS) were more commonly added to dates when it proved necessary or expedient to identify which calendar was being used for the given date.
For instance, depending on the order style, the abbreviated date "01/11/06" can be interpreted as "1 November 2006" for DMY, "January 11, 2006" for MDY, and "2001 November 6" for YMD. The ISO 8601 format YYYY-MM-DD (2025-03-01) is intended to harmonize these formats and ensure accuracy in all situations.
If conversion takes you past a February 29 that exists only in the Julian calendar, then February 29 is counted in the difference. Years affected are those which divide by 100 without remainder but do not divide by 400 without remainder (e.g., 1900 and 2100 but not 2000).