1646 (MDCXLVI) was a common year starting on Monday of the Gregorian calendar and a common year starting on Thursday of the Julian calendar, the 1646th year of the Common Era (CE) and Anno Domini (AD) designations, the 646th year of the 2nd millennium, the 46th year of the 17th century, and the 7th year of the 1640s decade. As of the start of 1646, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.

Millennium: 2nd millennium
1646 in various calendars
Gregorian calendar1646
Ab urbe condita2399
Armenian calendar1095
Assyrian calendar6396
Balinese saka calendar1567–1568
Bengali calendar1053
Berber calendar2596
English Regnal year21 Cha. 1 – 22 Cha. 1
Buddhist calendar2190
Burmese calendar1008
Byzantine calendar7154–7155
Chinese calendar乙酉(Wood Rooster)
4342 or 4282
    — to —
丙戌年 (Fire Dog)
4343 or 4283
Coptic calendar1362–1363
Discordian calendar2812
Ethiopian calendar1638–1639
Hebrew calendar5406–5407
Hindu calendars
 - Vikram Samvat1702–1703
 - Shaka Samvat1567–1568
 - Kali Yuga4746–4747
Holocene calendar11646
Igbo calendar646–647
Iranian calendar1024–1025
Islamic calendar1055–1056
Japanese calendarShōhō 3
Javanese calendar1567–1568
Julian calendarGregorian minus 10 days
Korean calendar3979
Minguo calendar266 before ROC
Nanakshahi calendar178
Thai solar calendar2188–2189
Tibetan calendar阴木鸡年
(female Wood-Rooster)
1772 or 1391 or 619
    — to —
(male Fire-Dog)
1773 or 1392 or 620

It is one of eight years (CE) to contain each Roman numeral once (1000(M)+500(D)+100(C)+(-10(X)+50(L))+5(V)+1(I) = 1646).











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