Julian Calendar to Gregorian Calendar
| COUNTRY | YEAR GREGORIAN ADOPTED | DATES AFFECTED | ADOPTED NEW YEAR 1 January |
| Albania | Circa 1912 | None stated | |
| Austro-Hungarian Empire | 1584 | 7 Jan became 17 Jan | |
| Belguim | 1582 | 11 Mar became 21 Mar | 1556 |
| Bulgaria | 1915 | None Stated | |
| China | 1912 | None Stated | |
| Denmark | 1700 | 19 Feb became 1 Mar | 1559 |
| Estonia | Circa 1917 | None Stated | |
| Finland | 1753 | 18 Feb became 1 Mar | |
| France & possessions | 1582 | 10 Dec became 20 Dec | |
| France | Republican Calendar | 1793-1805 | 1564 |
| Germay - Catholic States | 1582 | None Stated | 1544, Lorraine 1579 |
| Germany - Protestant States | 1700 | 19 Feb became 1 Mar | 1544 |
| Germany - Ausburg | 1583 | 14 Feb became 24 Feb | 1544 |
| Germany - Lousitz & Silesia | 1584 | 13 Jan became 23 Jan | 1544 |
| Germany - Paderborn | 1585 | 17 June became 27 June | 1544 |
| Germany - Pfalz-Neuberg | 1615 | 14 Dec became 24 Dec | 1544 |
| Germany - Prussia | 1612 | 23 Aug became 2 Sept | 1559 |
| Great Britain & Colonies | 1752 | 3 Sept became 14 Sept | England & Wales 1752, Scotland 1600 |
| Greece | 1923 | Changed during February | |
| Hungary | 1587 | None Stated | |
| Italy | 1582 | None Stated | Venice 1522 Tuscany 1751 |
| Japan | 1872 | None Stated | |
| Latvia | 1917 | None Stated | |
| Lithuania | 1917 | None Stated | |
| Luxembourg | 1582 | None Stated | |
| Netherlands - Catholic | 1582 | 15 Dec became 25 Dec | Spanish 1556 |
| Netherlands - Protestant | 1700 | 19 Feb became 1 Mar | 1583 |
| Norway | 1700 | 19 Feb became 1 Mar | |
| Poland | 1582 | 5 Oct became 15 Oct | |
| Portugal | 1582 | 5 Oct became 15 Oct | 1556 |
| Romania | 1919 | None Stated | |
| Russia | 1917 | 1921 | 1725 |
| Russia - Greek, Serbian and Roumanian churches | 1923 | None Stated | |
| Spain | 1582 | 5 Oct became 15 Oct | 1556 |
| Sweden | 1700-1740, all leap years eliminated | Change was gradual | 1559 |
| Switzerland - Catholic | 1583 | None Stated | |
| Switzerland - Protestant | 1780 | 19 Feb became 1 Mar | |
| Switzerland - Gallen | 1724 | None Stated | |
| Switzerland - Glarus & Appenzell | 1798 | None Stated | |
| Switzerland - Granbueden | 1798 | None Stated | |
| Turkey | 1917 | None Stated | |
| Yugoslavia | 1919 | None Stated |
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