Genealogy.com
Starting Sept. 5, 2014, Genealogy.com will be making a big change. GenForum message boards, Family Tree Maker homepages, and the most popular articles will be preserved in a read-only format, while several other features will no longer be available, including member subscriptions and the Shop.
 
Learn more
New? Start Here
Genealogy How-To
 Getting Started
 Getting Organized
 Developing Your Research Skills
 Sharing Your Family's Story
 Reference Guide
 Biography Assistant
Free Genealogy Classes
 Beginning Genealogy
 Internet Genealogy
 Tracing Immigrant Origins
Search

Family Finder
First Name:
Middle:
Last:
 
Double date

Beginning in 45 B.C., many parts of the world used the Julian calendar to mark the passage of time. According to the Julian calendar, March 25 was the first day of the year and each year was 365 days and 6 hours long. In 1582, Pope Gregory XIII determined that the Julian calendar was incorrect: each day was just a little bit too long. This meant that the human calendar wasn't keeping up with nature's calendar, and the seasons kept arriving slightly earlier in the year. To solve the problem, Pope Gregory XIII created the Gregorian calendar. This is the calendar that we use officially in the United States. As you know, this new calendar changed the first day of the year from March 25 to January 1. Pope Gregory also had everyone jump ahead by 10 days to make up for the days that were lost when the world was using the old Julian calendar.

The practice of writing double dates resulted from this switch from the Julian to the Gregorian calendar, and also from the fact that not all countries and people accepted the new calendar at the same time. For example, England and the American colonies didn't officially accept the new calendar until 1752. Before 1752, the English government still observed March 25 as the first of the year, but most of the population observed January 1 as the first of the year. For this reason, many people wrote dates falling between January 1 and March 25 with both years, as in the following examples.

Julian or Old Style   Gregorian or New Style   Double Date
         
December 25, 1718   December 25, 1718   December 25, 1718
         
January 1, 1718   January 1, 1719   January 1, 1718/19
         
February 2, 1718   February 2, 1719   February 2, 1718/19
         
March 20, 1718   March 20, 1719   March 20, 1718/19
         
March 25, 1719   March 25, 1719   March 25, 1719

By the time England and the colonies adopted the new Gregorian calendar, the discrepancy between the two calendars was eleven days, instead of ten. To resolve the discrepancy, the government ordered that September 2, 1752 be followed by September 14, 1752. Some people also added 11 days to their birth dates (a fact which is not noted on their birth certificates).

"How-To" Guide Menu
Return to the Main Menu of the Genealogy "How-To" Guide

Home | Help | About Us | Site Index | Terms of Service | PRIVACY
© 2011 Ancestry.com