1804 (MDCCCIV) was a leap year starting on Sunday (dominical letter AG) of the Gregorian calendar and a leap year starting on Friday (dominical letter CB) of the Julian calendar, the 1804th year of the Common Era (CE) and Anno Domini (AD) designations, the 804th year of the 2nd millennium, the 4th year of the 19th century, and the 5th year of the 1800s decade. Note that the Julian day for 1804 is 12 calendar days difference, which continued to be used from 1582 until the complete conversion of the Gregorian calendar was entirely done in 1929. Wikipedia
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