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2637 B.C.E.
January 1, 45 B.C.E.
ca. C.E. 359
1582
October 5-14, 1582
1582-1584
partial acceptance in 1700
full acceptance in 1775
1752
1784
September 3-13, 1752
1873
1917 (and again in 1940)
1949
1971
4th or 5th millennium C.E.
1972
Date Emperor Huangdi invented the Chinese calendar (legend) ;
Date Caesar changed Roman year to Julian calendar ;
Date Sanhedrin president Hillel II codified the Jewish calendar :
Date Pope Gregory reformed the calendar ;
Dates Gregory eliminated by Papal bull to realign his calendar with the solar year ;
Dates most Catholic countries accepted the Gregorian calendar ;
Date Protestant Germany accepted the Gregorian calendar ;
Date Great Britain (and the American colonies) accepted the Gregorian calendar ;
Date Benjamin Franklin first proposed Daylight Saving Time ;
Dates Parliament eliminated ;
Date Japan accepted the Gregorian calendar ;
Date Russia accepted the Gregorian calendar ;
Date China accepted the Gregorian calendar ;
Date the Eastern Orthodox Church last voted to reject the Gregorian calendar and retain the Julian calendar ;
When the Gregorian calendar will become twelve calendar hours ahead of the astronomer's mean tropical year ;
Date Atomic Time replaced Earth Time as the world's official scientific time standard ;
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