1700 (MDCC) was an exceptional common year starting on Friday of the Gregorian calendar and a leap year starting on Monday of the Julian calendar, the 1700th year of the Common Era (CE) and "Anno Domini" (AD) designations, the 700th year of the 2nd millennium, the 100th and last year of the 17th century, and the 1st year of the 1700s decade. As of the start of 1700, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.