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You are at the section Calendar History

Dual Dating of Using Calendars

  1. From 1582 until 1923, when the last European country adopted the Gregorian calendar, dual dating (sometimes with dual years) were seen.
  2. The dual years were because the Julian Calendar still had New Year's Day on March 25. For example, "10/21 February 1750/51" or 10 Feb 1750 (or O.S.)/Feb 21, 1751 Gregorian (or N.S.)
  3. For some countries that were to begin the Gregorian calendar later in the year, they rolled over the new year on January 1 but continued to use the Julian dates until they officially dropped some 10-13 days when moving to the new year.
    1. Example: January 1, 1751 (Juilan with New Year on March 25 in some countries), January 1, 1752 (Julian with the New Year on January 1 in Great Britian and its colonies since it was to begin the Gregorian year later that year), or January 12, 1752 (Gregorian date)
    2. ex: John Dee (1527-1608/9) was his year range using Julian - Julian/Gregorian years of birth and death.
    3. For dating between the Julian-1 and Julian-3-25- calendars, dual dating occurred on dates before March 25. Example: March 24 1609/10.
Calendar History Main Page Calendar 1: The Romulus Calendar I Calendar 2: The Republican Calendar I Calendar 3: The Republican Calendar II Calendar 4: The Republican Transitional Calendar Calendar 5: The Julian-Roman-Actual-1 Calendar Calendar 6: The Julian-Roman-Transitional-1 Calendar Calendar 7: The Julian-Roman-1 Calendar Calendar 8: The Julian-Kalends-1 Calendar Calendar 9: The Julian-1 Calendar Calendar 10: The Gregorian Calendar Dual Dating Date Confusion Definition of Days on the Calendars Definition of Calendars: Others Old, New and Unknown Styles Leap Year Error on the Julian-Roman-Actual-1 Calendar What Calendars Each Country Was Using Gregorian-Julian Differences By Century New Years Days Addenda Day and Year Measurements Calendar Varieties-Gregorian Calendar Varieties-Julian Calendar Varieties-Other Years Converted From Julian Period Day Lining Up Julian Dates Between Earth and Mars The Martian Calendar of Earth Converting From the Julian Period Date Creating a Julian Period Day Database File Truncating Answers Conversion Between Julian-1 and Gregorian Calendars Create a Calendar Leap Year Day Comparisons Swedish Calendar 1700-1712 Fractions of Years, Etc.
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