1789 (MDCCLXXXIX) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Monday of the Julian calendar, the 1789th year of the Common Era (CE) and Anno Domini (AD) designations, the 789th year of the 2nd millennium, the 89th year of the 18th century, and the 10th and last year of the 1780s decade. As of the start of 1789, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.
