A date written with the year denoting two successive years separated by a slash.

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7
votes
2answers
163 views

When did the double date window end?

(Great, now I'm all paranoid about double dates and how they're affecting my data...) Several references have been made to the "double date window", period of time where the Julian and Gregorian ...
6
votes
5answers
723 views

What is a “double date”?

What is a "double date"? Why do I sometimes see dates written as January 13, 1718/1719? See also: How do I write the year with a double date?
13
votes
7answers
520 views

How do I write the year with a double date?

If I have a date on a birth certificate that says: "January 13, 1719", do I write the year as 1719, 1718/19, or 1719/20 (the latter two being double dates). What if the date is April 28, 1719? ...