1804
| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1804 in topic: |
| Humanities |
| Archaeology – Architecture – Art – Literature – Music |
| By country |
| Australia – Brazil - Canada – Denmark - France – Germany – Mexico – Norway - Philippines - Portugal– Russia - South Africa – Spain - Sweden - United Kingdom – United States |
| Other topics |
| Rail Transport – Science – Sports |
| Lists of leaders |
| Sovereign states – State leaders – Territorial governors – Religious leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Works category |
| Works |
| Gregorian calendar | 1804 MDCCCIV |
| French Republican calendar | 12–13 |
| Ab urbe condita | 2557 |
| Armenian calendar | 1253 ԹՎ ՌՄԾԳ |
| Assyrian calendar | 6554 |
| 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 |
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. As of the start of 1804, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
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