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Recording Old Dates in Genealogy

When recording old dates for genealogy, you can enter either a Julian date or a Gregorian date provided that you carefully record which calendar is being used. Alternatively, you can convert old Julian dates to the Gregorian date equivalent and enter the Gregorian date into your records, with a notation that it is a Julian date converted to a Gregorian date. When you are uncertain whether the date is a Julian date or a Gregorian date, then this should also be noted. This is a common occurence when finding records using the Genealogy Search Engine.

Example: Converting a Julian Date to a Gregorian Date

A person is born in England on 1 March 1751. Since this date is before September 1752, we can be reasonably certain the date has been recorded using the Julian calendar system. To convert this Julian date to the equivalent Gregorian date, it is necessary to do the following:

  • Step 1: Add 11 days. Thus, 1 March becomes 12 March.
  • Step 2: (this step is only necessary if the Julian date is between 1 January and 25 March). Add one year. Thus, 1751 becomes 1752.

Thus, the equivalent Gregorian date is 12 March 1752.

Gregorian calendar
This table provides a handy reference showing when major countries moved to 1 January as the beginning of their calendar year. It also shows when they officially converted to the Gregorian calendar.


Holy Roman Empire 1582
The map shows the extent of the Holy Roman Empire (mentioned in the table above) in 1582 when Pope Gregory XIII issued his papal bull to change the Julian calendar.

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