“When recording British history, it is usual to use the dates recorded at the time of the event.”
As it should be. It’s annoying to read about an event in say, Colonial times, that’s been adjusted for the Gregorian calendar, often without a footnote or calendar system in parentheses. The date of the arrival in Plymouth or the founding of Boston, for examples.
Those I recognize, but knowing about sketchy sloppy business with dates, I’ll find myself having to research to check for the “real” date.
If a calendar change happened during person’s lifetime (as with the Founders), would their birthday dates have changed?
Granted, it gets a little weird with the Jan-Mar year shift, but dang, a birthday’s a birthday.
/pet peeve
Carry on...
George Washington wrote his birthdate both ways from time to time. It also trips up genealogists or makes their work more difficult at least.