Genealogy double dating

Throughout history there have been numerous attempts to convey time in relation to the sun and moon.Even now the Chinese and Islamic calendars are based on the motion of the moon around the earth, rather than the motion of the earth in relation to the sun, and the Jewish calendar links years to the cycle of the sun and months to the cycle of the moon. C., Julius Caesar ordered a calendar consisting of twelve months based on a solar year.

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However, if they are actually separated by the new year, then they are actually only a month apart, and the first follows the second: When a date is subtracted from another, a Span is created.

A date Span can be used for creating a textual representation of the difference.

Now when we sort, we see that the year begins with Mar, followed by all of the months up to Dec, then Jan, Feb and the first part of March is last.

Likewise, date differences can also be made with this method.

Some locations changed from the Julian calendar to the Gregorian calendar at the same time that they changed the new year from March 25 to January 1.

However, in many places in the world these two events did not happen at the same time.

As these are related, they are represented in similar manners.

To indicate that a calendar is in Julian (or any other calendar) one only need put the calendar name in parenthesis after the date. You can sort them by wrapping Date() around them and comparing to another Date.

The new data entry screen currently looks like: Dual dated dates (also called "double dating", "slash dates", and sometimes "Old Style/New Style" dates) appear like Jan 23, 1735/6.

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