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The data below have been copied from Claus Tøndering's Calendar FAQ V2.4. I have reformatted it and I made a few minor textual edits, but I do not claim anything on this page to be mine. All credits are for Claus Tøndering. (I hope and assume he agrees with my copying of part of his pages). |
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The papal bull of February 1582 decreed that 10 days should be dropped from October 1582 so that 15 October should follow immediately after 4 October, and from then on the reformed calendar should be used. This was observed in Italy, Poland, Portugal, and Spain. Other Catholic countries followed shortly after, but Protestant countries were reluctant to change, and the Greek orthodox countries didn't change until the start of the 1900s. The following list contains the dates for changes in a number of countries. It is very strange that in many cases there seems to be some doubt among authorities about what the correct days are. Different sources give very different dates in some cases. The list below does not include all the different opinions about when the change took place. |
| Albania: | December 1912 | |
| Austria: | ||
| Brixen, Salzburg and Tyrol: | 5 Oct 1583 was followed by 16 Oct 1583 | |
| Carinthia and Styria: | 14 Dec 1583 was followed by 25 Dec 1583 | |
| See also Czechoslovakia and Hungary | ||
| Belgium: | 20 Dec 1582 was followed by 31 Dec 1582, or 21 Dec 1582 was followed by 1 Jan 1583 (then part of the Netherlands) | |
| Bulgaria: | 31 Mar 1916 was followed by 14 Apr 1916 | |
| Canada: | ||
| 2 Sep 1752 was followed by 14 Sep 1752 | ||
| Mainland Nova Scotia: | Gregorian: 1605 - 13 Oct 1710, Julian: 2 Oct 1710 - 2 Sep 1752, Gregorian since 14 Sep 1752 | |
| Rest of Canada: | Gregorian from first European settlement | |
| China: | ||
| Officially: | 1912 | |
| In practice: | 1949 (communist revolution) | |
| Czechoslovakia (i.e. Bohemia and Moravia): | 6 Jan 1584 was followed by 17 Jan 1584 | |
| Denmark (including Norway): | 18 Feb 1700 was followed by 1 Mar 1700 | |
| Egypt: | 1875 | |
| Estonia: | 31 Jan 1918 was followed by 14 Feb 1918 | |
| Finland: | Then part of Sweden. (Note, however, that Finland later became part of Russia, which then still used the Julian calendar. The Gregorian calendar remained official in Finland, but some use of the Julian calendar was made.) | |
| France: | 9 Dec 1582 was followed by 20 Dec 1582 | |
| Alsace: | 5 Feb 1682 was followed by 16 Feb 1682 | |
| Lorraine: | 16 Feb 1760 was followed by 28 Feb 1760 | |
| Strasbourg: | February 1682 | |
| Germany: | ||
| Catholic states: | on various dates in 1583-1585 | |
| Prussia: | 22 Aug 1610 was followed by 2 Sep 1610 | |
| Protestant states: | 18 Feb 1700 was followed by 1 Mar 1700 | |
| (Many local variations) | ||
| Great Britain and Dominions: | 2 Sep 1752 was followed by 14 Sep 1752 | |
| Greece: | 9 Mar 1924 was followed by 23 Mar 1924 (some sources say 1916 and 1920) | |
| Hungary: | 21 Oct 1587 was followed by 1 Nov 1587 | |
| Ireland: | See Great Britain | |
| Italy: | 4 Oct 1582 was followed by 15 Oct 1582 | |
| Japan: | 1 Jan 1873 (to supplement the traditional Japanese calendar) | |
| Latvia: | During German occupation 1915 to 1918 | |
| Lithuania: | 1915 | |
| Luxemburg: | 14 Dec 1582 was followed by 25 Dec 1582 | |
| Netherlands (including Belgium): | ||
| "Staten Generaal": | 14 Dec 1582 was followed by 25 Dec 1582 | |
| Groningen: | 10 Feb 1583 was followed by 21 Feb 1583, went back to Julian in the summer of 1594, then 31 Dec 1700 was followed by 12 Jan 1701 | |
| Friesland: | 31 Dec 1700 was followed by 12 Jan 1701 | |
| Drenthe: | 30 Apr 1701 was followed by 12 May 1701 | |
| Overijssel: | 30 Nov 1700 was followed by 12 Dec 1700 | |
| Gelderland: | 30 Jun 1700 was followed by 12 Jul 1700 | |
| Utrecht: | 30 Nov 1700 was followed by 12 Dec 1700 | |
| Holland: | 1 Jan 1583 was followed by 12 Jan 1583 | |
| Zeeland and Brabrant: | 14 Dec 1582 was followed by 25 Dec 1582 | |
| Limburg and Belgium: | 20 Dec 1582 was followed by 31 Dec 1582 or 21 Dec 1582 was followed by 1 Jan 1583 | |
| Norway: | Then part of Denmark. | |
| Poland: | 4 Oct 1582 was followed by 15 Oct 1582 | |
| Portugal: | 4 Oct 1582 was followed by 15 Oct 1582 | |
| Romania: | 31 Mar 1919 was followed by 14 Apr 1919 (The Greek Orthodox parts of the country may have changed later) | |
| Russia: | 31 Jan 1918 was followed by 14 Feb 1918 (In the eastern parts of the country the change may not have occured until 1920) | |
| Scotland: | Much confusion exists regarding Scotland's change. Different authorities disagree about whether Scotland changed together with the rest of Great Britain, or if they changed earlier. | |
| Spain: | 4 Oct 1582 was followed by 15 Oct 1582 | |
| Sweden (including Finland): | 17 Feb 1753 was followed by 1 Mar 1753 | |
Sweden has a curious history. It decided to make a gradual change from the Julian to the Gregorian calendar. By dropping every leap year from 1700 through 1740 the eleven superfluous days would be omitted and from 1 Mar 1740 they would be in sync with the Gregorian calendar. (But in the meantime they would be in sync with nobody!) So 1700 (which should have been a leap year in the Julian calendar) was not a leap year in Sweden. However, by mistake 1704 and 1708 became leap years. Therefore they decided to go back to the Julian calendar. In order to do this, they inserted an extra day in 1712, making that year a double leap year! So in 1712, February had 30 days in Sweden. Later, in 1753, Sweden changed to the Gregorian calendar by dropping 11 days like everyone else. | ||
| Switzerland: | ||
| Catholic cantons: | 1583, 1584 or 1597 | |
| Protestant cantons: | 31 Dec 1700 was followed by 12 Jan 1701 | |
| (Many local variations) | ||
| Turkey: | Jan 1927 | |
| USA: | ||
| Along the Eastern seaboard: | With Great Britain in 1752. | |
| Washington, Oregon: | With Great Britain in 1752. | |
| Mississippi valley: | With France in 1582. | |
| Texas, Florida, California, Nevada, Arizona, New Mexico: | With Spain in 1582 | |
| Alaska: | October 1867 when it became part of the USA. | |
| Wales: | See Great Britain | |
| Yugoslavia: | 1919 | |
(HR: I suggest you do not attempt to memorise this entire table for your quick calendar calculations 
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