![Ancestry.com - Webinars show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/039/517/small/ancestry-com-webinars.png)
Summary: You may have seen the double dates recorded in some family trees - a birth date listed as 1743/1744. But, do you know WHY it is recorded that way? Join Crista Cowan for a look at the switch from the Julian calendar to the Gregorian calendar and that aff ects your family history research.