Years for births and deaths in the 17th century sometimes are written as two years separated by a forward slash (e.g., 1650/51). Yesterday, I read in 'The Pioneers of Maine and New Hampshire...' by Pope (1908) that this is done because:
March 25 was New Year's Day in England and her colonies in the seventeenth century.... From January 1 to March 25, durng which some other nations used the new year number, they often wrote a double date. (pp. x-xi)
In our Wikitree profiles, I don't think we're given this option (are we?). Is there a style rule for entering 'double years'? I looked in the 'Style' pages but wasn't certain I found the correct answer.