1637 (MDCXXXVII) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1637th year of the Common Era (CE) and Anno Domini (AD) designations, the 637th year of the 2nd millennium, the 37th year of the 17th century, and the 8th year of the 1630s decade. As of the start of 1637, 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: 1600s  1610s  1620s  – 1630s –  1640s  1650s  1660s
Years: 1634 1635 163616371638 1639 1640
1637 in other calendars
Gregorian calendar1637
MDCXXXVII
Ab urbe condita2390
Armenian calendar1086
ԹՎ ՌՁԶ
Assyrian calendar6387
Balinese saka calendar1558–1559
Bengali calendar1044
Berber calendar2587
English Regnal year12 Cha. 1 – 13 Cha. 1
Buddhist calendar2181
Burmese calendar999
Byzantine calendar7145–7146
Chinese calendar丙子(Fire Rat)
4333 or 4273
    — to —
丁丑年 (Fire Ox)
4334 or 4274
Coptic calendar1353–1354
Discordian calendar2803
Ethiopian calendar1629–1630
Hebrew calendar5397–5398
Hindu calendars
 - Vikram Samvat1693–1694
 - Shaka Samvat1558–1559
 - Kali Yuga4737–4738
Holocene calendar11637
Igbo calendar637–638
Iranian calendar1015–1016
Islamic calendar1046–1047
Japanese calendarKan'ei 14
(寛永14年)
Javanese calendar1558–1559
Julian calendarGregorian minus 10 days
Korean calendar3970
Minguo calendar275 before ROC
民前275年
Nanakshahi calendar169
Thai solar calendar2179–2180
Tibetan calendar阳火鼠年
(male Fire-Rat)
1763 or 1382 or 610
    — to —
阴火牛年
(female Fire-Ox)
1764 or 1383 or 611

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