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 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) the Gregorian calendar, as already used in most of western Europe.
when was the gregorian calendar introduced in england
1750