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1804 in other calendars
Gregorian calendar	1804; MDCCCIV
French Republican calendar	12–13
Ab urbe condita	2557
Armenian calendar	1253; ԹՎ ՌՄԾԳ
Assyrian calendar	6554
Balinese saka calendar	1725–1726
Bengali calendar	1211
Berber calendar	2754
British Regnal year	44 Geo. 3 – 45 Geo. 3
Buddhist calendar	2348
Burmese calendar	1166
Byzantine calendar	7312–7313
Chinese calendar	癸亥年 (Water Pig); 4500 or 4440; — to —; 甲子年 (Wood Rat); 4501 or 4441
Coptic calendar	1520–1521
Discordian calendar	2970
Ethiopian calendar	1796–1797
Hebrew calendar	5564–5565
Hindu calendars
- Vikram Samvat	1860–1861
- Shaka Samvat	1725–1726
- Kali Yuga	4904–4905
Holocene calendar	11804
Igbo calendar	804–805
Iranian calendar	1182–1183
Islamic calendar	1218–1219
Japanese calendar	Kyōwa 3 / Bunka 1; (文化元年)
Javanese calendar	1730–1731
Julian calendar	Gregorian minus 12 days
Korean calendar	4137
Minguo calendar	108 before ROC; 民前108年
Nanakshahi calendar	336
Thai solar calendar	2346–2347
Tibetan calendar	阴水猪年; (female Water-Pig); 1930 or 1549 or 777; — to —; 阳木鼠年; (male Wood-Rat); 1931 or 1550 or 778

Millennium:	2nd millennium
Centuries:	18th century – 19th century – 20th century
Decades:	1770s 1780s 1790s – 1800s – 1810s 1820s 1830s
Years:	1801 1802 1803 – 1804 – 1805 1806 1807

1804 (MDCCCIV) was a leap year starting on Sunday in the Gregorian calendar and a leap year starting on Friday in the Julian calendar. The Gregorian calendar was 12 days ahead of the Julian calendar. The Julian calendar remained in localized use until 1923.