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I would say it's almost never appropriate unless you're directly quoting source texts. If you are talking about a historical event from Egypt in 500 BCE, you w

I would say it's almost never appropriate unless you're directly quoting source texts. If you are talking about a historical event from Egypt in 500 BCE, you would say "this happened in 500 BCE", not "this happened in year 26 of the 27th dynasty". The distinction is important in the context of doing historical research, but it is no more appropriate to write dates in secondary sources using the Julian calendar than it would be to try to explain Egyptian history by spouting hieroglyphics at people.

da_chicken 1mo ago
Yeah, but how often are we talking about exactly specific dates without referring to specific historical texts? The Magna Carta was sealed on June 15, 1215 for the Julian calendar. But if you want the actual anniversary, it was sealed on June 22, 1215 using the proleptic Gregorian calendar. Do you want to know the date people remember, ir the date of the true anniversary? The coronation of Henry VIII is listed almost everywhere you look as June 24, 1509. Except that's also Julian. The date of the Gregorian calendar is July 4, 1509. We don't remember the proleptic dates. We remember the dates that were then in use. And if you say you're just always going to use the contemporary recorded date, that's fine. Until you get to dates like February 29, 1700. What do you put in your system then?
- NetMageSCW 1mo ago
  What happens when you try to talk about the age of George Washington?
  - da_chicken 1mo ago
    That one is actually kind of interesting. So he was born on Feb 11 the year before the British empire adopted the Gregorian calendar. After the change, his birthday was Feb 22. Feb 22 is the date that we generally remember. That makes sense because George himself wouldn't have any personal memory of the Julian (often called "old style" at the time) date. However, as you'd expect of such a situation, a lot of people at the time knew the old style Feb 11 date, so he was known to acknowledge both dates to people that came up to him. Somewhat famously, the last year of his life he publicly celebrated his birthday on Feb 11 while away from home, and then upon returning to Mount Vernon he celebrated it again on Feb 22.

da_chicken 1mo ago

Yeah, but how often are we talking about exactly specific dates without referring to specific historical texts? The Magna Carta was sealed on June 15, 1215 for the Julian calendar. But if you want the actual anniversary, it was sealed on June 22, 1215 using the proleptic Gregorian calendar. Do you want to know the date people remember, ir the date of the true anniversary? The coronation of Henry VIII is listed almost everywhere you look as June 24, 1509. Except that's also Julian. The date of the Gregorian calendar is July 4, 1509. We don't remember the proleptic dates. We remember the dates that were then in use. And if you say you're just always going to use the contemporary recorded date, that's fine. Until you get to dates like February 29, 1700. What do you put in your system then?

NetMageSCW 1mo ago
What happens when you try to talk about the age of George Washington?
- da_chicken 1mo ago
  That one is actually kind of interesting. So he was born on Feb 11 the year before the British empire adopted the Gregorian calendar. After the change, his birthday was Feb 22. Feb 22 is the date that we generally remember. That makes sense because George himself wouldn't have any personal memory of the Julian (often called "old style" at the time) date. However, as you'd expect of such a situation, a lot of people at the time knew the old style Feb 11 date, so he was known to acknowledge both dates to people that came up to him. Somewhat famously, the last year of his life he publicly celebrated his birthday on Feb 11 while away from home, and then upon returning to Mount Vernon he celebrated it again on Feb 22.