England Calendar Changes

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Wikipedia has more about this subject: Calendar (New Style) Act 1750

The Gregorian calendar, the one that is commonly used today, is a correction of the Julian calendar, which was 11 days behind the solar year by 1752 because of miscalculated leap years.

England began using the new calendar in 1752. Eleven days were omitted in that year to bring the calendar in line with the solar year. The day after Wednesday, 2 September 1752, became Thursday, 14 September 1752. Also at that time, the first day of the year changed to 1 January. Before 1752 the first day of the year was 25 March.

Wikipedia has more about this subject: Old Style and New Style dates

Pre-1752 dates may be confusing. For example, the day after 24 March 1565 was 25 March 1566. Dates between 1 January and 24 March are often recorded using a technique called “double dating.” An example of a date using double dating is 16 February 1696/7. At the time it would be considered 1696 following the old style Julian calendar or 1697 following the new style Gregorian calendar.

Go to Regnal Years in England to read about how a monarch's reign influenced the English calendar.