If you have done genealogy for any length of time, you have probably come across a date that is listed as two possible dates. Of course, you want to know what the real dates are, as this is important to the accuracy of your research, as well as your understanding of it. In fact, the pivotal year for double dating is That was the year that England changed its calendar from the Julian to the Gregorian.
Double Dates and Change from the Julian to the Gregorian Calendar in
Dates are a very important part of historical and genealogical research, but they also aren't always as they appear. For most of us, the Gregorian calendar in common use today is all we encounter in modern records. Eventually, however, as we work back in time, or delve into religious or ethnic records, it is common to encounter other calendars and dates with which we aren't familiar. These calendars can complicate the recording of dates in our family tree, unless we can accurately convert and record the calendar dates into a standard format, so that there is no further confusion. The calendar in common use today, known as the Gregorian calendar , was created in to replace the previously used Julian calendar.
Dual dating is the practice, in historical materials, to indicate some dates with what appears to be duplicate, or excessive digits, sometimes separated by a hyphen or a slash. This is also often referred to as double dating. For details see the article Old Style and New Style dates. The Latin equivalents, which are used in many languages, are stili veteris genitive or stilo vetere ablative , abbreviated st. Consequently, in places that have fully transitioned from an OS calendar to a NS calendar, dual dates appear in documents over an extended period of time, even centuries.