1644 (MDCXLIV) was a leap year starting on Friday of the Gregorian calendar and a leap year starting on Monday of the Julian calendar, the 1644th year of the Common Era (CE) and Anno Domini (AD) designations, the 644th year of the 2nd millennium, the 44th year of the 17th century, and the 5th year of the 1640s decade. As of the start of 1644, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.

Millennium: 2nd millennium
Centuries: 16th century17th century18th century
Decades: 1610s  1620s  1630s  – 1640s –  1650s  1660s  1670s
Years: 1641 1642 164316441645 1646 1647
1644 in other calendars
Gregorian calendar1644
MDCXLIV
Ab urbe condita2397
Armenian calendar1093
ԹՎ ՌՂԳ
Assyrian calendar6394
Balinese saka calendar1565–1566
Bengali calendar1051
Berber calendar2594
English Regnal year19 Cha. 1 – 20 Cha. 1
Buddhist calendar2188
Burmese calendar1006
Byzantine calendar7152–7153
Chinese calendar癸未(Water Goat)
4340 or 4280
    — to —
甲申年 (Wood Monkey)
4341 or 4281
Coptic calendar1360–1361
Discordian calendar2810
Ethiopian calendar1636–1637
Hebrew calendar5404–5405
Hindu calendars
 - Vikram Samvat1700–1701
 - Shaka Samvat1565–1566
 - Kali Yuga4744–4745
Holocene calendar11644
Igbo calendar644–645
Iranian calendar1022–1023
Islamic calendar1053–1054
Japanese calendarKan'ei 21 / Shōhō 1
(正保元年)
Javanese calendar1565–1566
Julian calendarGregorian minus 10 days
Korean calendar3977
Minguo calendar268 before ROC
民前268年
Nanakshahi calendar176
Thai solar calendar2186–2187
Tibetan calendar阴水羊年
(female Water-Goat)
1770 or 1389 or 617
    — to —
阳木猴年
(male Wood-Monkey)
1771 or 1390 or 618

Events

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