Dates of Change from Julian to Gregorian Calendar

Determining the dates of change from the Julian calendar to the Gregorian calendar is not as easy as it seems it should be. Countries, and sometimes areas within countries, changed calendars over a period hundreds of years.

Pope Gregory XIII issued the papal bull Inter gravissimas on February 24, 1582, instituting the reform of the Julian calendar. Greece was the last European country to adopt the Gregorian calendar in 1923.


Country		 Start
Year
Jan 1		 Last
Julian
Date		 First
Gregorian
Date
France (and Colonies) December 9, 1582 December 20, 1582
France, Alsace 16481 16482
France, Artois December 21, 1582 January 1, 1583
France, Loraine December 9, 1582 December 20, 1582
France, Strasbourg February 5, 16823 February 16, 16824
Great Britain (and Colonies), except Scotland 1752 September 2, 17525 September 14, 17526
Great Britain, Scotland 16007 September 2, 17528 September 14, 17529
Greece September 14, 191610

February 15, 1923		 September 28, 191611

March 1, 1923
Holy Roman Empire, Catholic states 154412
Holy Roman Empire, Protestant states 155913
Spain (and Colonies) 155614 October 4, 158215 October 15, 158216
United States, Alaska
Changed when United States took over control from Russia. Alaska skipped 11 days instead of 12 because it flipped over the dateline as it made the change.		 October 6, 1867 October 18, 186717
United States, British Colonies
Changed with Great Britain.		 September 2, 175218 September 14, 175219
United States, French Colonies
Changed with France.		 December 9, 1582 December 20, 1582
United States, Spanish Colonies
Changed with Spain.		 October 4, 1582 October 15, 1582
Yugoslavia
1919 in the regions comprising the former Kingdoms of Serbia and Montenegro (present-day Kosovo, Montenegro, Serbia and Macedonia). The western and northern regions of what became Yugoslavia were already using the Gregorian calendar. For example, most of Slovenia adopted the Gregorian calendar at the same time as Austria in 1583. Coastal Croatia, which was at the time ruled by Venice, adopted the Gregorian calendar in 1582. Inland Croatia, ruled by the Habsburgs, adopted it in 1587 along with Hungary. The Gregorian calendar was used in Bosnia and Herzegovina since the 16th century by the Catholic population and was formally adopted for government use in 1878 following occupation by Austria-Hungary.20		 March 4, 191921 March 18, 191922

 

Footnotes

  1. “Julian and Gregorian Calendars Genealogy“. FamilySearch Wiki. Accessed July 2, 2019.
  2. “Julian and Gregorian Calendars Genealogy“. FamilySearch Wiki. Accessed July 2, 2019.
  3. “Change from the Julian Calendar to the Gregorian Calendar“. SearchforAncestors.com. Accessed July 2, 2019.
  4. “Change from the Julian Calendar to the Gregorian Calendar“. SearchforAncestors.com. Accessed July 2, 2019.
  5. Pattie, T.S. (1976) “An unexpected effect of the change in calendar in 1752“. British Library Journal.
  6. Pattie, T.S. (1976) “An unexpected effect of the change in calendar in 1752“. British Library Journal.
  7. John James Bond, “Handy-book of rules and tables for verifying dates with the Christian era“. Scottish decree on pp. xvii–xviii.
  8. Pattie, T.S. (1976) “An unexpected effect of the change in calendar in 1752“. British Library Journal.
  9. Pattie, T.S. (1976) “An unexpected effect of the change in calendar in 1752“. British Library Journal.
  10. “Change from the Julian Calendar to the Gregorian Calendar“. SearchforAncestors.com. Accessed July 2, 2019.
  11. “Change from the Julian Calendar to the Gregorian Calendar“. SearchforAncestors.com. Accessed July 2, 2019.
  12. “Gregorian calendar“. Wikipedia. Accessed July 2, 2019.
  13. “Gregorian calendar“. Wikipedia. Accessed July 2, 2019.
  14. “Gregorian calendar“. Wikipedia. Accessed July 2, 2019.
  15. “Change from the Julian Calendar to the Gregorian Calendar“. SearchforAncestors.com. Accessed July 2, 2019.
  16. “Change from the Julian Calendar to the Gregorian Calendar“. SearchforAncestors.com. Accessed July 2, 2019.
  17. “Change from the Julian Calendar to the Gregorian Calendar“. SearchforAncestors.com. Accessed July 2, 2019.
  18. “Change from the Julian Calendar to the Gregorian Calendar“. SearchforAncestors.com. Accessed July 2, 2019.
  19. “Change from the Julian Calendar to the Gregorian Calendar“. SearchforAncestors.com. Accessed July 2, 2019.
  20. “Gregorian calendar“. Wikipedia. Accessed July 2, 2019.
  21. “Change from the Julian Calendar to the Gregorian Calendar“. SearchforAncestors.com. Accessed July 2, 2019.
  22. “Change from the Julian Calendar to the Gregorian Calendar“. SearchforAncestors.com. Accessed July 2, 2019.