> "Jean Thompson, born the ten floréal year twelve (30 april 1804)". So the regular latin date is clearly mentioned on that document. I depends a lot on the do

> "Jean Thompson, born the ten floréal year twelve (30 april 1804)". So the regular latin date is clearly mentioned on that document. I depends a lot on the documents. A lot of historical French documents only have the Republican date written. Even at the time anyway, it would not have been difficult to find the corresponding Gregorian date, even in England probably.