Exercise 3: sample answer

Your answer will depend on the event you choose. One well-known example is the Gunpowder Plot, which is dated 5 November 1605 in England, then using the Julian calendar. The same day in the Gregorian calendar used on much of the Continent was 15 November (check the offset, ten days in the seventeenth century). Another is the Battle of Culloden, dated 16 April 1746 in Britain, still before the 1752 change (check).

Example write-up: "The museum label gave the date as 5 November 1605, which is Old Style, so a French source would have called it 15 November. Remember that the gap between the two calendars was ten days in 1605 and eleven days after 1700, so the offset depends on the century."

Tip: if a source gives no note, check the country and the year: England and its colonies used the Julian calendar until 1752.