# List of adoption dates of the Gregorian calendar by country

This is a list of adoption dates of the Gregorian calendar by country. For explanation, see the article about the Gregorian calendar.
Except where stated otherwise, the transition was a move by the civil authorities from the Julian to the Gregorian calendar. In religious sources it could be that the Julian calendar was used for a longer period of time, in particular by Protestant and Eastern Orthodox churches. The historic area does not necessarily match the present-day area or country. The column "Present country" only provides a logic search entry. With a few exceptions, the former colonies of European powers are not shown separately.
There are only four countries which have not adopted the Gregorian calendar for civil use: Ethiopia (Ethiopian calendar), Nepal (Vikram Samvat and Nepal Sambat), Iran (Solar Hijri calendar) and Afghanistan (Lunar Hijri Calendar). Thailand has adopted the Gregorian calendar for days and months, but uses its own era for years: the Buddhist era. Many countries also continue to use traditional calendars for religious and ceremonial purposes.

## List

Legend
| Present country | Historic area | Year | Date of the last day before the change | Date of the first day after the change | Days omitted | Particulars |
| Albania | Albania | 1912 | 14 Nov | 28 Nov | 13 | Albanian Catholics have used the Gregorian calendar since 5 Oct 1583. |
| Armenia | Transcaucasian Democratic Federative Republic | 1918 | 17 Apr | 1 May | 13 | |
| Austria | Carinthia | 1583 | 14 Dec | 25 Dec | 10 | |
| Austria | Lower Austria | 1583 | 20 Oct | 31 Oct | 10 | |
| Austria | Salzburg | 1583 | 10 Feb | 21 Feb | 10 | |
| Austria | Styria | 1583 | 11 Dec | 22 Dec | 10 | |
| Austria | Tyrol, Further Austria | 1583 | 4 Oct | 15 Oct | 10 | |
| Austria | Upper Austria | 1583 | 20 Oct | 31 Oct | 10 | |
| Azerbaijan | Transcaucasian Democratic Federative Republic | 1918 | 17 Apr | 1 May | 13 | |
| Belarus | Grand Duchy of Lithuania | 1585 | 21 Dec | 1 Jan (1586) | 10 | |
| Belarus | Lithuania Governorate | 1800 | 11 Jan | 1 Jan | -11 | Return to the Julian calendar |
| Belarus | Grodno Governorate | 1915 | 22 Aug | 5 Sept | 13 | |
| Belarus | Soviet Russia | 1918 | 31 Jan | 14 Feb | 13 | |
| Belgium | Flanders | 1582 | 14 Dec | 25 Dec | 10 | Edict of Francis, Duke of Anjou followed |
| Belgium | Liège | 1583 | 10 Feb | 21 Feb | 10 | Edict of Philip II of Spain followed |
| Belgium | Southern Netherlands | 1582 | 20 Dec | 31 Dec | 10 | or one day later; areas under Spanish rule: Artois, occupied Brabant, occupied Flanders, Hainaut, Limburg, Luxemburg, Namur |
| Bulgaria | Bulgaria | 1916 | 31 Mar | 14 Apr | 13 | |
| Cambodia | French colonial empire | 1863 | | | N/A | Previously used the Burmese calendar. |
| Canada | French colonial empire | 1582 | 9 Dec | 20 Dec | 10 | |
| Canada | Nova Scotia | 1710 | 13 Oct | 3 Oct | -11 | Return to the Julian calendar |
| Canada | British Empire | 1752 | 2 Sep | 14 Sep | 11 | |
| China | China | 1911 | 12 "11th Month" | 1 Jan (1912) | N/A | Previously used the Chinese calendar. Because of a civil war, the official transition did not end until 1929, with Minguo year numbering remaining in use until 1949. |
| Czech Republic | Bohemia | 1584 | 6 Jan | 17 Jan | 10 | |
| Czech Republic | Moravia | 1584 | 15 Oct | 26 Oct | 10 | Estates initially refused the change ordered early October. |
| Czech Republic | Silesia | 1584 | 6 Jan | 17 Jan | 10 | Excluding the Duchy of Krnov |
| Czech Republic | Duchy of Krnov | 1584 | 6 Mar | 17 Mar | 10 | |
| Denmark | Denmark-Norway | 1700 | 18 Feb | 1 Mar | 11 | |
| Egypt | Egypt | 1875 | 6 Epag. | 11 Sept | N/A | Previously used the Alexandrian calendar for fiscal purposes |
| Estonia | Estonia | 1918 | 15 Feb | 1 Mar | 13 | |
| Faroe Islands | Norway | 1700 | 16 Nov | 28 Nov | 11 | |
| France | France | 1582 | 9 Dec | 20 Dec | 10 | Excluding Alsace and Lorraine |
| France | France | 1793 | 23 Sep | 3 Vend. (II) | N/A | Introduction of the French Republican calendar |
| France | France | 1805 | 10 Niv. (XIV) | 1 Jan 1806 | N/A | The French Republican calendar ended. |
| France | Sedan | 1582 | 9 Dec | 20 Dec | 10 | |
| France | Austrian Upper Alsace and Breisgau | 1583 | 13 Oct | 24 Oct | 10 | |
| France | Roman Catholic Archdiocese of Strasbourg | 1583 | 16 Nov | 27 Nov | 10 | |
| France | Alsace, Protestant parts (except Mulhouse, see below), i.e. Strasbourg, and, on same date or shortly after, Protestant parishes over Alsace | 1682 | 5 Feb | 16 Feb | 10 | |
| France | Lorraine | 1582 | 9 Dec | 20 Dec | 10 | |
| France | Lorraine | 1735 | | | -11 | Return to the Julian calendar |
| France | Lorraine | 1760 | 16 Feb | 28 Feb | 11 | |
| France | Mulhouse | 1700 | 31 Dec | 12 Jan (1701) | 11 | |
| Germany | Aachen | 1582 | 31 Dec | 11 Jan (1583) | 10 | |
| Germany | Augsburg | 1583 | 13 Feb | 24 Feb | 10 | |
| Germany | Margraviate of Baden-Baden | 1583 | 16 Nov | 27 Nov | 10 | |
| Germany | Duchy of Bavaria, Prince-Bishopric of Regensburg, Prince-Bishopric of Freising, Prince-Bishopric of Eichstätt | 1583 | 5 Oct | 16 Oct | 10 | |
| Germany | Biberach | 1603 | 12 Feb | 23 Feb | 10 | Protestants did not largely accept the new calendar until 30 Nov 1604. |
| Germany | Electorate of Cologne, Imperial City of Cologne | 1583 | 2 Nov | 13 Nov | 10 | |
| Germany | Prince-Bishopric of Constance | 1584 | 8 Feb | 19 Feb | 10 | |
| Germany | Prince-Provostry of Ellwangen | 1583 | 14 Feb | 25 Feb | 10 | |
| Germany | Further Austria | 1583 | 4 Oct | 15 Oct | 10 | Including Breisgau, Swabian Austria, Ortenau |
| Germany | Prince-Bishopric of Hildesheim | 1631 | 15 Mar | 26 Mar | 10 | Excluding the city of Hildesheim itself |
| Germany | Hildesheim | 1632 | 14 Dec | 25 Dec | 10 | |
| Germany | Duchy of Jülich, Duchy of Berg | 1583 | 2 Nov | 13 Nov | 10 | |
| Germany | Kaufbeuren | 1583 | 13 Feb | 24 Feb | 10 | |
| Germany | Lusatia | 1584 | 6 Jan | 17 Jan | 10 | Some Upper Lusatian towns delayed adoption, latest was Königsbrück in May 1584. |
| Germany | Electorate of Mainz | 1583 | 11 Nov | 22 Nov | 10 | Local resistance in Erfurt until 1700 |
| Germany | Prince-Bishopric of Minden | 1668 | 1 Feb | 12 Feb | 10 | |
| Germany | Prince-Bishopric of Münster, Duchy of Cleves, County of Mark | 1583 | 16 Nov | 27 Nov | 10 | |
| Germany | Prince-Bishopric of Osnabrück | 1624 | 14 Nov | 25 Nov | 10 | |
| Germany | Prince-Bishopric of Paderborn | 1585 | 16 Jun | 27 Jun | 10 | |
| Germany | Electoral Palatinate | 1686 | 11 Feb | 22 Feb | 10 | |
| Germany | Duchy of Palatinate-Neuburg | 1615 | 13 Dec | 24 Dec | 10 | |
| Germany | Prince-Bishopric of Passau | 1582 | 4 Oct | 15 Oct | 10 | |
| Germany | Ravensburg | 1584 | 8 Feb | 19 Feb | 10 | |
| Germany | Electorate of Trier | 1583 | 4 Oct | 15 Oct | 10 | |
| Germany | Duchy of Westphalia | 1584 | 1 Jul | 12 Jul | 10 | |
| Germany | Prince-Bishopric of Würzburg | 1583 | 4 Nov | 15 Nov | 10 | |
| Germany | Germany, Protestant parts | 1700 | 18 Feb | 1 Mar | 11 | |
| Georgia | Transcaucasian Democratic Federative Republic | 1918 | 17 Apr | 1 May | 13 | |
| Greece | Greece | 1923 | 15 Feb | 1 Mar | 13 | Excluding Mount Athos |
| Hungary | Hungary | 1587 | 21 Oct | 1 Nov | 10 | |
| Iceland | Norway | 1700 | 16 Nov | 28 Nov | 11 | |
| Ireland | O'Neill and O'Donnell Gaelic Lordships in Ulster | 1584 | | | 10 | Papal dispensation to return to Julian calendar applied for in 1630, in operation by 1641 |
| Ireland | Kingdom of Ireland | 1752 | 2 Sept | 14 Sept | 11 | The British Calendar (New Style) Act 1750 also applied to Ireland (as stated in its preamble). For details, see Calendar Act: Ireland. |
| Italy | various | 1582 | 4 Oct | 15 Oct | 10 | |
| Italy | County of Tyrol, Prince-Bishopric of Brixen | 1583 | 4 Oct | 15 Oct | 10 | Brixen possibly one day later |
| Japan | Japan | 1872 | 2 "12th month" | 1 Jan (1873) | N/A | Previously used the Japanese calendar. Japanese era names still remain in use. |
| Laos | French colonial empire | 1889 | | | N/A | Previously used the Burmese calendar. |
| Latvia | Courland | 1617 | | | 10 | |
| Latvia | Courland | 1796 | 7 Feb | 28 Jan | -11 | Return to the Julian calendar |
| Latvia | Courland | 1915 | 11 May | 25 May | 13 | |
| Latvia | Livland | 1915 | 22 Aug | 5 Sept | 13 | |
| Lithuania | Grand Duchy of Lithuania | 1585 | 21 Dec | 1 Jan (1586) | 10 | |
| Lithuania | Lithuania Governorate | 1800 | 11 Jan | 1 Jan | -11 | Return to the Julian calendar |
| Lithuania | Kovno and Vilna Governorates | 1915 | 11 May | 25 May | 13 | |
| Lithuania | Duchy of Prussia | 1610 | 22 Aug | 2 Sept | 10 | North eastern Ducal Prussia is now part of Lithuania. |
| Luxembourg | Duchy of Luxemburg | 1582 | 20 Dec | 31 Dec | 10 | |
| Montenegro | Yugoslavia | 1919 | 14 Jan | 28 Jan | 13 | |
| Myanmar | Burma (British Empire) | 1885 | | | N/A | Previously used the Burmese calendar. |
| Netherlands | Brabant | 1582 | 14 Dec | 25 Dec | 10 | Edict of Francis, Duke of Anjou followed |
| Netherlands | Drenthe | 1701 | 30 Apr | 12 May | 11 | |
| Netherlands | Frisia | 1700 | 31 Dec | 12 Jan (1701) | 11 | |
| Netherlands | Gelderland | 1700 | 30 Jun | 12 Jul | 11 | |
| Netherlands | Groningen (city) | 1583 | 1 Mar | 12 Mar | 10 | Edict of Philip II of Spain was: 10 followed by 21 February (proclaimed later) |
| Netherlands | Groningen (city) | 1594 | 19 Nov | 10 Nov | -10 | Return to the Julian calendar |
| Netherlands | Groningen (province) | 1700 | 31 Dec | 12 Jan (1701) | 11 | Stad and Ommelanden |
| Netherlands | Holland | 1583 | 1 Jan | 12 Jan | 10 | Edict of Francis, Duke of Anjou followed later on |
| Netherlands | Overijssel | 1700 | 30 Nov | 12 Dec | 11 | |
| Netherlands | States General | 1582 | 14 Dec | 25 Dec | 10 | Edict of Francis, Duke of Anjou followed |
| Netherlands | Utrecht | 1700 | 30 Nov | 12 Dec | 11 | |
| Netherlands | Zeeland | 1582 | 14 Dec | 25 Dec | 10 | Edict of Francis, Duke of Anjou followed |
| North Korea | Joseon | 1895 | 16 "11th month" | 1 Jan (1896) | N/A | Previously used the Korean calendar. In addition to the Gregorian calendar, the Juche calendar is in use. |
| North Macedonia | Yugoslavia | 1919 | 14 Jan | 28 Jan | 13 | |
| Norway | Denmark-Norway | 1700 | 18 Feb | 1 Mar | 11 | |
| Poland | Poland | 1582 | 4 Oct | 15 Oct | 10 | Local resistance |
| Poland | Duchy of Prussia | 1610 | 22 Aug | 2 Sept | 10 | Southern Ducal Prussia is now part of Poland |
| Poland | Silesia | 1584 | 6 Jan | 17 Jan | 10 | Excluding Wrocław, Wąsosz, Wołów, Bolesławiec, Świdnica |
| Poland | Wrocław, Wąsosz, Wołów, Bolesławiec | 1584 | 18 Jan | 29 Jan | 10 | |
| Poland | Świdnica | 1584 | 11 Jan | 22 Jan | 10 | |
| Poland | Margraviate of Brandenburg | 1700 | 18 Feb | 1 Mar | 11 | Along with the other Prostestant Imperial Estates |
| Portugal | Portuguese Empire | 1582 | 4 Oct | 15 Oct | 10 | |
| Romania | Transylvania | 1590 | 14 Dec | 25 Dec | 10 | |
| Romania | Romania | 1919 | 31 Mar | 14 Apr | 13 | |
| Russia | Duchy of Prussia | 1610 | 22 Aug | 2 Sept | 10 | Northern Ducal Prussia is now part of Russia. |
| Russia | Russia | 1918 | 31 Jan | 14 Feb | 13 | |
| Saudi Arabia | Saudi Arabia | 2016 | 28 DaH (1437) | 1 Oct | N/A | Previously used the Islamic calendar. |
| Serbia | Yugoslavia | 1919 | 14 Jan | 28 Jan | 13 | |
| Slovenia | Duchy of Carniola | 1583 | 4 Oct | 15 Oct | 10 | |
| Slovenia | Duchy of Styria | 1583 | 11 Dec | 22 Dec | 10 | |
| Spain | Spanish Empire | 1582 | 4 Oct | 15 Oct | 10 | |
| South Korea | Joseon | 1895 | 16 "11th month" | 1 Jan (1896) | N/A | Previously used the Korean calendar. |
| Sweden | Swedish Empire | 1700 | 28 Feb | 1 Mar | 1 | Including Finland; introduction of the Swedish calendar |
| Sweden | Swedish Empire | 1712 | 30 Feb (sic) | 1 Mar | -1 | Including Finland; return to the Julian calendar |
| Sweden | Sweden | 1753 | 17 Feb | 1 Mar | 11 | Including Finland |
| Switzerland | Roman Catholic Diocese of Basel | 1583 | 20 Oct | 31 Oct | 10 | |
| Switzerland | Luzern, Uri, Schwyz, Zug, Freiburg, Solothurn, Le Landeron | 1584 | 11 Jan | 22 Jan | 10 | |
| Switzerland | Obwalden, Nidwalden | 1584 | 11 Feb | 22 Feb | 10 | |
| Switzerland | Thurgau, Appenzell Innerrhoden, Appenzell Ausserrhoden | 1584 | | | 10 | |
| Switzerland | Appenzell Ausserrhoden | 1597 | | | -10 | Return to the Julian calendar |
| Switzerland | Lower Valais | 1623 | | | 10 | |
| Switzerland | Graubünden (Catholic parts) | 1623–1624 | | | 10 | |
| Switzerland | Valais | 1655 | 28 Feb | 11 Mar | 10 | |
| Switzerland | Switzerland, Protestant parts | 1700 | 31 Dec | 12 Jan (1701) | 11 | Basel, Bern, Neuchâtel, Sargans, Schaffhausen, Geneva and Zürich |
| Switzerland | Glarus (Catholic part) | 1700 | 31 Dec | 12 Jan (1701) | 11 | |
| Switzerland | City of St. Gallen | 1724 | | | 11 | |
| Switzerland | Glarus (Protestant part) | 1798 | 22 Jun | 4 Jul | 11 | |
| Switzerland | Appenzell Ausserrhoden | 1798 | 13 Dec | 25 Dec | 11 | |
| Switzerland | Graubünden (Protestant part) | 1783–1811 | | | 11–12 | Communes changed at different times. Oberengadin and Bergel changed in 1783. In Schiers and Grüsch, 25 Dec 1811 was followed by 7 Jan 1812. |
| Thailand | Siam | 1889 | | 1 Apr | N/A | Previously used the Thai lunar calendar. The year numbering followed the Rattanakosin Era until 1912, when it was replaced by the Buddhist era; see Thai solar calendar. |
| Turkey | Ottoman Empire | 1917 | 15 Feb | 1 Mar | 13 | The year numbering followed the Rumi calendar until 1 Jan 1926, when the Anno Domini era was adopted. |
| Uganda | British Empire | 1893 | 31 Dec | 13 Jan (1894) | 12 | |
| Ukraine | Ukrainian People's Republic | 1918 | 15 Feb | 1 Mar | 13 | |
| United Kingdom | Kingdom of Great Britain and Kingdom of Ireland | 1752 | 2 Sept | 14 Sept | 11 | The Calendar (New Style) Act 1750 was passed to ensure alignment with the rest of Europe, but made no reference to Gregory. |
| United States of America | French colonial empire and Spanish Empire | 1582 | 9 Dec | 20 Dec | 10 | |
| United States of America | British Empire | 1752 | 2 Sept | 14 Sept | 11 | Some States adopted as their Common Law the laws of England in 1607, prior to the New Style Calendar Act. |
| 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. The International Date Line was changed, so only 11 days were omitted (a Friday was followed by another Friday). |