1663 (MDCLXIII) was a common year starting on Monday (dominical letter G) of the Gregorian calendar and a common year starting on Thursday (dominical letter D) of the Julian calendar, the 1663rd year of the Common Era (CE) and Anno Domini (AD) designations, the 663rd year of the 2nd millennium, the 63rd year of the 17th century, and the 4th year of the 1660s decade. As of the start of 1663, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.
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January–June
July–December
Date unknown
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