- published: 09 Sep 2013
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1686 (MDCLXXXVI) was a common year starting on Tuesday (dominical letter F) of the Gregorian calendar and a common year starting on Friday (dominical letter C) of the Julian calendar, the 1686th year of the Common Era (CE) and Anno Domini (AD) designations, the 686th year of the 2nd millennium, the 86th year of the 17th century, and the 7th year of the 1680s decade. Note that the Julian day for 1686 is 10 calendar days difference, which continued to be used from 1582 until the complete conversion of the Gregorian calendar was entirely done in 1929.