1857 (MDCCCLVII) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Tuesday of the Julian calendar, the 1857th year of the Common Era (CE) and Anno Domini (AD) designations, the 857th year of the 2nd millennium, the 57th year of the 19th century, and the 8th year of the 1850s decade. As of the start of 1857, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.