alt Hacker NewsIt's typically not used in modern historical writing when referring to events located in areas that used the Julian calendar at that time.
But it is typically used when referring to events located in areas with no calendar system familiar to modern readers, most notably the Maya calendar. Maya Long Count dates are typically converted to the proleptic Gregorian calendar.
Also, many modern historical writings will display both Julian and Gregorian dates, particularly for dates around when the calendars were changing or when context is unclear (e.g. a historical figure who was born in an area with one calendar and died in an area with another calendar).
> Also, many modern historical writings will display both Julian and Gregorian dates, particularly for dates around when the calendars were changing or when context is unclear (e.g. a historical figure who was born in an area with one calendar and died in an area with another calendar).
To follow up on this, George Washington is a great example. He was born about 20 years before the British calendar changed from Julian to Gregorian and changed the new year from beginning on March 25 to January 1.
The vast majority of modern sources will cite Washington's birthday as February 22, 1732, which is actually the proleptic Gregorian calendar (called "New Style"). George Washington himself would have said that his birthday was February 11, 1731, at least until the British calendar changed in 1752 (at which point he probably would have still used the "Old Style" since it would have been clear from context).