| 1582 | | 4 Oct:
The Gregorian calendar is introduced. The next day is October 15th.Britannica UFL |
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| 1618 | | 23 May:
The Thirty Years War, a series of wars fought by European nations for various reasons, is initiated when the Holy Roman Emperor attempts to force Catholicism on most of Europe, and ends with the Peace of Westphalia.OSU CT |
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| 1648 | | 24 Oct:
The Thirty Years War ends with the signing of the Treaty of Westphalia.LoC Avalon |
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| 1830 | | 29 Nov:
The November Uprising begins when Poles rebel against Russian occupation.W&W GS |
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| 1884 | | 1 Nov:
Greenwich Mean Time is adopted universally when the International Meridian Conference meets in Washington, DC.GMT OFA |
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| 1906 | | 3 Nov:
The distress signal S.O.S. becomes the worldwide standard at the 2nd International Radiotelegraphic Convention.SIMag GA&C |
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| 1914 | |
| 1918 | | Feb:
The Spanish Flu pandemic kills at least 3% of the World's population.VLib npr |
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| | 27 Dec:
Greater Poland Uprising - Poles begin their push for independence from Prussian control in the city of Poznań, which quickly spreads.PolandIn PC |
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| 1919 | |
| 1939 | |
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| 1943 | | 19 Apr:
Jews in the Warsaw Ghetto begin uprising against the Nazis.USHMM JVL |
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| 1945 | | 7 May:
Germany unconditionally surrenders, effectively ending World War II in Western Europe. Soviet surrender terms were signed the next day.DoD USHMM |
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| | 24 Oct:
The United Nations is established.UN USState |
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| 1949 | | 4 Apr:
NATO, or the North Atlantic Treaty Organization, is founded.USNA Avalon |
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| 1954 | | 29 Sep:
The CERN Convention is entered into force.CERN SA |
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| 2003 | | 19 Mar:
The U. S., along with coalition forces, begins its "shock and awe" campaign against Saddam Hussein and Iraq.npr NT |
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Poland
