1831 (MDCCCXXXI)
was a common year starting on Saturday of the Gregorian calendar and a common year starting on Thursday of the Julian calendar, the 1831st year of the Common Era (CE) and Anno Domini (AD) designations, the 831st year of the 2nd millennium, the 31st year of the 19th century, and the 2nd year of the 1830s decade. As of the start of 1831, the Gregorian calendar was
12 days ahead of the Julian calendar, which remained in localized use until 1923.
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