1770 (MDCCLXX) was a common year starting on Monday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1770th year of the Common Era (CE) and Anno Domini (AD) designations, the 770th year of the 2nd millennium, the 70th year of the 18th century, and the 1st year of the 1770s decade. As of the start of 1770, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.