1840
| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1840 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 | 1840 MDCCCXL |
| Ab urbe condita | 2593 |
| Armenian calendar | 1289 ԹՎ ՌՄՁԹ |
| Assyrian calendar | 6590 |
| Bengali calendar | 1247 |
| Berber calendar | 2790 |
| British Regnal year | 3 Vict. 1 – 4 Vict. 1 |
| Buddhist calendar | 2384 |
| Burmese calendar | 1202 |
| Byzantine calendar | 7348–7349 |
| Chinese calendar |
己亥年 (Earth Pig) 4536 or 4476 — to — 庚子年 (Metal Rat) 4537 or 4477 |
| Coptic calendar | 1556–1557 |
| Discordian calendar | 3006 |
| Ethiopian calendar | 1832–1833 |
| Hebrew calendar | 5600–5601 |
| Hindu calendars | |
| - Vikram Samvat | 1896–1897 |
| - Shaka Samvat | 1761–1762 |
| - Kali Yuga | 4940–4941 |
| Holocene calendar | 11840 |
| Igbo calendar | 840–841 |
| Iranian calendar | 1218–1219 |
| Islamic calendar | 1255–1256 |
| Japanese calendar |
Tenpō 11 (天保１１年) |
| Javanese calendar | 1767–1768 |
| Julian calendar | Gregorian minus 12 days |
| Korean calendar | 4173 |
| Minguo calendar | 72 before ROC 民前72年 |
| Nanakshahi calendar | 372 |
| Thai solar calendar | 2382–2383 |
1840 (MDCCCXL) was a leap year starting on Wednesday (dominical letter ED) of the Gregorian calendar and a leap year starting on Monday (dominical letter GF) of the Julian calendar, the 1840th year of the Common Era (CE) and Anno Domini (AD) designations, the 840th year of the 2nd millennium, the 40th year of the 19th century, and the 1st year of the 1840s decade. As of the start of 1840, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
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