1800 (MDCCC) was an exceptional common year starting on Wednesday (dominical letter E) of the Gregorian calendar and a leap year starting on Sunday (dominical letter AG) of the Julian calendar, the 1800th year of the Common Era (CE) and Anno Domini (AD) designations, the 800th year of the 2nd millennium, the 100th and last year of the 18th century, and the 1st year of the 1800s decade. Note that the Julian day for 1800 is 11 calendar days difference, which continued to be used from 1582 until the complete conversion of the Gregorian calendar was entirely done in 1929. The Gregorian calendar was 11 days ahead of the Julian calendar until Friday, February 28 [O.S. February 17, 1800] 1800, but 12 days ahead from Saturday, March 1 [O.S. February 18, 1800] 1800. Wikipedia
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