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1630 (MDCXXX) was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1630th year of the Common Era (CE) and Anno Domini (AD) designations, the 630th year of the 2nd millennium, the 30th year of the 17th century, and the 1st year of the 1630s decade. As of the start of 1630, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.