Back 1831 Abkhazian 1831 Afrikaans 1831 ALS 1831 እ.ኤ.አ. Amharic 1831 AN 1831 Arabic 1831 ARY 1831 ARZ 1831 AST 1831 AVK
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| Millennium: | 2nd millennium |
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| 1831 by topic |
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| Humanities |
| By country |
| Other topics |
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | 1831 MDCCCXXXI |
| Ab urbe condita | 2584 |
| Armenian calendar | 1280 ԹՎ ՌՄՁ |
| Assyrian calendar | 6581 |
| Balinese saka calendar | 1752–1753 |
| Bengali calendar | 1238 |
| Berber calendar | 2781 |
| British Regnal year | 1 Will. 4 – 2 Will. 4 |
| Buddhist calendar | 2375 |
| Burmese calendar | 1193 |
| Byzantine calendar | 7339–7340 |
| Chinese calendar | 庚寅年 (Metal Tiger) 4528 or 4321 — to — 辛卯年 (Metal Rabbit) 4529 or 4322 |
| Coptic calendar | 1547–1548 |
| Discordian calendar | 2997 |
| Ethiopian calendar | 1823–1824 |
| Hebrew calendar | 5591–5592 |
| Hindu calendars | |
| - Vikram Samvat | 1887–1888 |
| - Shaka Samvat | 1752–1753 |
| - Kali Yuga | 4931–4932 |
| Holocene calendar | 11831 |
| Igbo calendar | 831–832 |
| Iranian calendar | 1209–1210 |
| Islamic calendar | 1246–1247 |
| Japanese calendar | Tenpō 2 (天保２年) |
| Javanese calendar | 1758–1759 |
| Julian calendar | Gregorian minus 12 days |
| Korean calendar | 4164 |
| Minguo calendar | 81 before ROC 民前81年 |
| Nanakshahi calendar | 363 |
| Thai solar calendar | 2373–2374 |
| Tibetan calendar | 阳金虎年 (male Iron-Tiger) 1957 or 1576 or 804 — to — 阴金兔年 (female Iron-Rabbit) 1958 or 1577 or 805 |
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1831 (MDCCCXXXI) was a common year starting on Saturday of the Gregorian calendar and a common year starting on Thursday of the Julian calendar, the 1831st year of the Common Era (CE) and Anno Domini (AD) designations, the 831st year of the 2nd millennium, the 31st year of the 19th century, and the 2nd year of the 1830s decade. As of the start of 1831, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.