Adoption of the Gregorian Calendar

Date: September 14, 1752 • Location: London, United Kingdom

Under the terms of the Calendar (New Style) Act 1750, the British Empire adopted the Gregorian calendar, skipping 11 days of the month.

The Calendar Act 1750, also known as Chesterfield's Act or 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. The act also changed the start of the legal year from 25 March to 1 January.