1585 (MDLXXXV) was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1585th year of the Common Era (CE) and Anno Domini (AD) designations, the 585th year of the 2nd millennium, the 85th year of the 16th century, and the 6th year of the 1580s decade. As of the start of 1585, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.