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| Millennium: | 2nd millennium |
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| Centuries: | |
| Decades: | |
| Years: |
| 1842 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 | 1842 MDCCCXLII |
| Ab urbe condita | 2595 |
| Armenian calendar | 1291 ԹՎ ՌՄՂԱ |
| Assyrian calendar | 6592 |
| Balinese saka calendar | 1763–1764 |
| Bengali calendar | 1249 |
| Berber calendar | 2792 |
| British Regnal year | 5 Vict. 1 – 6 Vict. 1 |
| Buddhist calendar | 2386 |
| Burmese calendar | 1204 |
| Byzantine calendar | 7350–7351 |
| Chinese calendar | 辛丑年 (Metal Ox) 4539 or 4332 — to — 壬寅年 (Water Tiger) 4540 or 4333 |
| Coptic calendar | 1558–1559 |
| Discordian calendar | 3008 |
| Ethiopian calendar | 1834–1835 |
| Hebrew calendar | 5602–5603 |
| Hindu calendars | |
| - Vikram Samvat | 1898–1899 |
| - Shaka Samvat | 1763–1764 |
| - Kali Yuga | 4942–4943 |
| Holocene calendar | 11842 |
| Igbo calendar | 842–843 |
| Iranian calendar | 1220–1221 |
| Islamic calendar | 1257–1258 |
| Japanese calendar | Tenpō 13 (天保１３年) |
| Javanese calendar | 1769–1770 |
| Julian calendar | Gregorian minus 12 days |
| Korean calendar | 4175 |
| Minguo calendar | 70 before ROC 民前70年 |
| Nanakshahi calendar | 374 |
| Thai solar calendar | 2384–2385 |
| Tibetan calendar | 阴金牛年 (female Iron-Ox) 1968 or 1587 or 815 — to — 阳水虎年 (male Water-Tiger) 1969 or 1588 or 816 |
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1842 (MDCCCXLII) was a common year starting on Saturday of the Gregorian calendar and a common year starting on Thursday of the Julian calendar, the 1842nd year of the Common Era (CE) and Anno Domini (AD) designations, the 842nd year of the 2nd millennium, the 42nd year of the 19th century, and the 3rd year of the 1840s decade. As of the start of 1842, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.