| Timeline |
|---|
| 0001 CE | Beginning of Christian calendar year, 1 A.D. (anno Domini). | |
| 0079 CE | The Hindu calendar was updated to the solar year with this year as year 1. The original dated back to about 1000 BC. | |
| c. 0166 CE | (Between 166-174) Pope Soter, moved 'Easter' from Biblical Nisan 14 to following Sunday. | |
| 0190 CE | Pope Victor I called Council to determine 'official' new date of 'Easter' but failed, excommunicated Eastern churches that continued to observe 'Easter' on Biblical Nisan 14 'Quartodeciman'. | |
| c. 0202 CE | Irenaeus, 2nd bishop of Lyons, supported Quartodecimans in Easter controversy versus Pope Victor in 190, wrote 'Against Heresies'. | |
| 0243 CE | The text 'De Pascha Computus' calculated the spring equinox, March 25, under the Julian calendar from the first day of creation. The author used this to derive March 28 as the birthday of Jesus. | |
| 1 Jan 0313 CE | A 15 year cycle used in reckoning ecclesiastical calendars was established as a fiscal term to regulate taxes. It is called the Roman Indiction. | |
| 0338 CE | Judaism adopted 19-year cycle lunisolar calendar. | |
| 0400 CE | The Angles and Saxons crossed the North Sea to England bringing with them the 5 day week: Tiwsday - of the god Tiw; Wodensday - of the god Woden; Thorsday - of the god Thor; Frigsday - of the goddess Frig; and Seternesday - of the god Seterne. | |
| 0525 CE | Dionysius Exiguus set Christian calendar, Jesus' birth December 23 in 1ce. | |
| 0549 CE | Jerusalem held to a Jan 6 date for the celebration of the Nativity of Jesus until this year. In the end the West added the Epiphany and the East added the Dec 25 nativity to their liturgical calendars. | |
| c. 0556 CE | Dionysius Exiguus, Scythian monk, died. He devised the current system of reckoning the Christian era. | |
| 0597 CE | Britain adopts Julian calendar. | |
| 16 Jul 0622 CE | Mohammad flees Mecca to Media (The Hegira) and the start of the Moslem lunar calendar. | |
| c. 0700 CE | (Between 700-800) Dionysus Exiguus (Dennis the Short), a Catholic monk, created a chronology for Pope St. John I with a calendar that began in the year 1. | |
| 0990 CE | Russia adopts Julian calendar | |
| 1079 CE | Iran adopts solar Hijrah calendar | |
| 1079 CE | Omar ibn Ibrahim al-Chajjam completes Jalali-calendar | |
| 1125 CE | Abraham bar Hiyya ha-Nasi Jewish calendar | |
| 1345 CE | Attempted calendar reform of Pope Clement VI. | |
| 7 Jun 1502 CE | Pope Gregory XIII was born. He introduced the Gregorian calendar in 1582. | |
| 1517 CE | Pope Leo X's calendar reform fails. | |
| 1552 CE | The shift from the Julian to the Gregorian calendar was begun. | |
| 1564 CE | France adopted the reformed calendar and shifted the new year from April to Jan. Some didn't like the change and were called April fools. | |
| 1576 CE | The basilica of San Petronio was erected by Egnatio Danti, a mathematician and Dominican friar who worked for Cosimo I dei Medici, the Grand Duke of Tuscany. The structure included a solar observatory. Danti also advised Pope Gregory on calendar reform. | |
| 1581 CE | Pope Gregory XIII approves the results of his calendar reform commission. | |
| 24 Feb 1582 CE | Pope Gregory XIII - Aloysius Lilius - and Christopher Clavius introduce a Gregorian calendar with an improved leap year system removing the old Julian Calendar's error of one day in every 128 years. | |
| 4 Oct 1582 CE | The Church Council at Trent, Italy, discussed the error of 10 days in the calendar as referenced to the spring equinox which was used to establish the date for Easter. 'The Gregorian Adjustment', cretaed a calendar thet is accurate to a day in 3,323 years. | |
| 1582 CE | Italy and other Catholic countries introduce the Gregorian calendar and skip 10 days | |
| 1582 CE | Joseph Scaliger devised the Julian Period as a way to measure time. He named day 1 after his father, Julius Scaliger, and it begins on Jan. 1, 4713 BC, the will take 7,980 Julian years for the cycle to complete, the product of 28, 19 and 15. | |
| 1583 CE | Holland (Netherlands) & Flanders begin using the Gregorian calendar (yesterday was 1/1/1583) | |
| 1584 CE | Bohemia adopts the Gregorian calendar, Last day of the Julian calendar | |
| 1584 CE | Last day of the Julian calendar in Holy Roman empire. | |
| 1584 CE | Parts of Switzerland adopt Gregorian calendar (& parts in 1812) | |
| 1622 CE | Papal Chancery adopts 1 January as the beginning of the year (was March 25). | |
| c. 1655 CE | Archbishop James Usher of Dublin, Ireland, developed a timetable that set the creation of the world to 4004 BCE, and Noah's landing on Mount Ararat in 2348 BCE. | |
| 1656 CE | Dutch physicist Christiaan Huygens (1629-1695) built the first accurate pendulum clock. | |
| 1657 CE | A pendulum clock was designed by Christian Huygens and built by Solomon Coster. It is on exhibit at the Time Museum in Rockford, Ill. | |
| 1670 CE | Minute hands on watches first appeared. | |
| 1687 CE | Clocks began to be made with 2 hands for the first time | |
| 1699 CE | Peter the Great ordered Russian New Year changed from 1 September to 1 January. | |
| 1700 CE | Last day of the Julian calendar in Denmark. | |
| 1700 CE | Protestant West-Europe (except England) begin using the Gregorian calendar. | |
| 1700 CE | Russia replaces Byzantines with Julian calendar | |
| 1701 CE | Drenthe adopts the Gregorian calendar. | |
| 1701 CE | Frisia & Groningen begin use of the Gregorian calendar. | |
| 1701 CE | Parts of The Netherlands adopt the Gregorian calendar (the other parts of The Netherlands followed one year later). | |
| 2 Sep 1752 CE | Last day of Julian calendar in Britain, British colonies. | |
| 13 Sep 1752 CE | The Gregorian calendar reforms in Britain and the American colonies this and the next ten day did not exist (3-13 September 1752). New Year's Day was decreed to be 1 January and not 25 March. | |
| 14 Sep 1752 CE | England & colonies adopt Gregorian calendar, 11 days disappear. People riot thinking the government stole 11 days of their lives. | |
| 1 Mar 1753 CE | Sweden (which included Finland at that time) adopts the Gregorian Calendar. | |
| 1790 CE | Aztec calendar stone discovered in Mexico City | |
| 1793 CE | Republican calendar replaces Gregorian calendar in France. | |
| 1805 CE | End of French Republican calendar when France returns to Gregorianism. | |
| 1809 CE | Russia siezed Finland which became a grand duchy with the Russian Tzar as the Grand Duke. The Finns retained thier own legal system, Lutheran religion and calendar (although there was some use of the Julian calendar which was still used by Russia). The Finns were also exempt from Rusian military service. | |
| 1844 CE | Origin of Bahá'í Era-Bahá'í calendar starts here (Bahá 1, 1) and the declaration of the Báb (Bahá'í festival). | |
| 1858 CE | Calendar origin of the Modified Julian Period. | |
| 1867 CE | Alaska adopts the Gregorian calendar which crosses the international date line. | |
| 1867 CE | Last day of Julian calendar in Alaska | |
| 1873 CE | Origin of Japanese Era | |
| 1883 CE | Standard time zones eare stablished by railroads in the US and Canada. | |
| 1884 CE | The US adopts Standard Time. | |
| 1893 CE | Japan adopts the Gregorian calendar | |
| 1894 CE | Denmark adopts Mid-European time | |
| 1895 CE | Norway adopts Mid-European time | |
| 1902 CE | Canada's Maritime Provinces switch from Eastern to Atlantic time | |
| 1906 CE | Alberta adopts Mountain Standard Time | |
| 1916 CE | Britain begins using 'Summer Time' (Daylight Savings Time) | |
| 1918 CE | Estonia, Latvia & Lithuania adopt the Gregorian calendar | |
| 1918 CE | Independant Finland oficially adopts the New Style (Gregorian) calendar. | |
| 1918 CE | Russia adopts Gregorian calendar | |
| 1918 CE | The first daylight savings time in US goes into effect | |
| 1918 CE | US Congress authorizes time zones & approves daylight saving time | |
| 1920 CE | Greece adopts the Gregorian calendar | |
| 1920 CE | Last day of Julian civil calendar (in parts of Bulgaria) | |
| 1920 CE | Last day of Julian civil calendar in Greece | |
| 1923 CE | USSR adopts experimental calendar, with 5-day 'weeks' | |
| 1925 CE | Persia (Iran) adopts Khorshidi solar Hijrah calendar. | |
| 1931 CE | The first International Conference on Calendar Reform | |
| 27 Jun 1940 CE | End of USSR experimental calendar; Gregorian readopted | |
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