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Dates of the Gregorian Reform

The table below lists official adoption dates, with as much precision as I've been able to discover. Simply because the government told people to convert, however, does not mean they did so. Because of religiously inspired opposition to the conversion, both calendars were often in use in regions where there was a religiously mixed population.

The political map has changed enormously since the 16th century. Areas are listed more or less under their current affiliations, but some regions, e.g. Silesia, have been divided up since the conversion, and in these instances I've been arbitrary (Silesia is listed under Poland). This table lists only dates for those countries already using the Julian calendar before adopting the Gregorian one. Countries like Japan and China are therefore not shown. I have also not given separate entries for all the countries that formed out of the Spanish colonial empire. See under Spain for them.

Country/Region Last Julian First Gregorian
Albania 1912.12 1912.12
Austria
  Tyrol 1583.10.5 1583.10.16
  Carynthia, Styria 1583.12.14 1583.12.25
Belgium
  Spanish Provinces 1582.12.21 1583.1.1
  Liège (diocese) 1583.2.10 1583.2.21
Bulgaria 1915.11.1 1915.11.14
Czech Republic (Bohemia, Moravia) 1584.1.6 1584.1.17
Denmark 1700.2.18 1700.3.1
  Færø Islands 1700.11.16 1700.11.28
Estonia 1918.2.1 1918.2.15
Finland (see note on Sweden) 1753.2.17 1753.3.1
France 1582.12.9 1582.12.20
  Alsace 1648 1648
  Strasbourg 1682.2.5 1682.2.16
Germany, Catholic Regions
  Augsburg 1583.2.13 1583.2.24
  Baden (margravate) 1583.11.16 1583.11.27
  Bavaria (diocese) 1583.10.5 1583.10.16
  Cologne (archdiocese, incl. Aachen) 1583.11.3 1583.11.14
  Jülich 1583.11.2 1583.11.13
  Mainz 1583.11.11 1583.11.22
  Münster (city and archdiocese) 1583.11.16 1583.11.27
  Strasbourg (diocese only) 1583.11.16 1583.11.27
  Trier 1583.10.4 1583.10.15
  Würzburg (diocese) 1583.11.4 1583.11.15
Germany, Protestant Regions
  Hildesheim (diocese) 1631.3.15 1631.3.26
  Kurland 1617 1617
  Minden 1668.2.1 1668.2.12
  Neuburg (palatinate) 1615.12.13 1615.12.24
  Osnabrück (diocese) 1624 1624
  Paderborn (diocese) 1585.6.16 1585.6.27
  Prussia 1610.8.22 1610.9.2
  Westphalia 1584.7.1 1584.7.12
  All Others 1700.2.18 1700.3.1
Great Britain 1752.9.2 1752.9.14
Greece 1916.7.14 1916.7.28
Holy Roman Empire, Imperial Court
(see also Germany, Austria, Hungary, Czech Republic)
1584.1.6 1584.1.17
Hungary 1587.10.21 1587.11.1
  Transylvania 1590.12.14 1590.12.25
Iceland 1700.11.16 1700.11.28
Italy 1582.10.4 1582.10.15
Latvia 1918.2.1 1918.2.15
Lithuania 1918.2.1 1918.2.15
The Netherlands
  Holland, North Brabant 1582.12.21 1583.1.1
  Gelderland, Zutphen 1700.6.30 1700.7.12
  Utrecht, Overijssel 1700.11.30 1700.12.12
  Friesland, Groningen 1700.12.31 1701.01.12
  Drente 1701.04.30 1701.05.12
Norway 1700.2.18 1700.3.1
Poland 1582.10.4 1582.10.15
  Silesia 1584.1.12 1584.1.23
Portugal 1582.10.4 1582.10.15
Romania 1919.03.31 1919.04.14
Russia 1918.01.31 1918.02.14
Spain 1582.10.4 1582.10.15
  American Colonies 1584 1584
Sweden (final conversion -- see note) 1753.2.17 1753.3.1
Switzerland
  Lucern, Uri, Schwyz, Zug, Freiburg, Solothurn 1584.1.11 1584.1.22
  Wallis 1655.2.28 1655.3.11
  Zürich, Bern, Basel, Schaffhouse, Geneva, Thurgovia 1700.12.31 1701.1.12
  Appenzell, Glarus, St. Gallen 1724 1724
United States
  British Colonies 1752.9.2 1752.9.14
  Alaska 1867.10.5 1867.10.18
Yugoslavia 1919.03.04 1919.03.18
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