See http://freepages.genealogy.rootsweb.com/~neff/dates.htm A segment follows. Why Do USA Documents from the mid 1700s have Two Different Dates? In 1752 the American Colonies switched from the Julian Calendar to the Gregorian Calendar which required an 11-day elimination in the date. Therefore, Wednesday, September 2, 1752 was immediately followed by Thursday, September 14, 1752. Many people used both the Julian date and the new Gregorian date on documents to avoid confusion until everyone was adjusted to the change. While their consideration makes it easier for the genealogist to adjust dates on documents, it raises a question about calculated birth dates from newspaper death notices and tombstones. Diana