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.

Millennium: 2nd millennium
Centuries: 18th century19th century20th century
Decades: 1810s  1820s  1830s  – 1840s –  1850s  1860s  1870s
Years: 1839 1840 184118421843 1844 1845
1842 in other calendars
Gregorian calendar1842
MDCCCXLII
Ab urbe condita2595
Armenian calendar1291
ԹՎ ՌՄՂԱ
Assyrian calendar6592
Balinese saka calendar1763–1764
Bengali calendar1249
Berber calendar2792
British Regnal yearVict. 1 – 6 Vict. 1
Buddhist calendar2386
Burmese calendar1204
Byzantine calendar7350–7351
Chinese calendar辛丑(Metal Ox)
4538 or 4478
    — to —
壬寅年 (Water Tiger)
4539 or 4479
Coptic calendar1558–1559
Discordian calendar3008
Ethiopian calendar1834–1835
Hebrew calendar5602–5603
Hindu calendars
 - Vikram Samvat1898–1899
 - Shaka Samvat1763–1764
 - Kali Yuga4942–4943
Holocene calendar11842
Igbo calendar842–843
Iranian calendar1220–1221
Islamic calendar1257–1258
Japanese calendarTenpō 13
(天保13年)
Javanese calendar1769–1770
Julian calendarGregorian minus 12 days
Korean calendar4175
Minguo calendar70 before ROC
民前70年
Nanakshahi calendar374
Thai solar calendar2384–2385
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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