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1664 (MDCLXIV) was a leap year starting on Tuesday of the Gregorian calendar and a leap year starting on Friday of the Julian calendar, the 1664th year of the Common Era (CE) and Anno Domini (AD) designations, the 664th year of the 2nd millennium, the 64th year of the 17th century, and the 5th year of the 1660s decade. As of the start of 1664, 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: 1630s  1640s  1650s  – 1660s –  1670s  1680s  1690s
Years: 1661 1662 166316641665 1666 1667
1664 in other calendars
Gregorian calendar1664
Ab urbe condita2417
Armenian calendar1113
Assyrian calendar6414
Balinese saka calendar1585–1586
Bengali calendar1071
Berber calendar2614
English Regnal year15 Cha. 2 – 16 Cha. 2
Buddhist calendar2208
Burmese calendar1026
Byzantine calendar7172–7173
Chinese calendar癸卯(Water Rabbit)
4360 or 4300
    — to —
甲辰年 (Wood Dragon)
4361 or 4301
Coptic calendar1380–1381
Discordian calendar2830
Ethiopian calendar1656–1657
Hebrew calendar5424–5425
Hindu calendars
 - Vikram Samvat1720–1721
 - Shaka Samvat1585–1586
 - Kali Yuga4764–4765
Holocene calendar11664
Igbo calendar664–665
Iranian calendar1042–1043
Islamic calendar1074–1075
Japanese calendarKanbun 3
Javanese calendar1586–1587
Julian calendarGregorian minus 10 days
Korean calendar3997
Minguo calendar248 before ROC
Nanakshahi calendar196
Thai solar calendar2206–2207
Tibetan calendar阴水兔年
(female Water-Rabbit)
1790 or 1409 or 637
    — to —
(male Wood-Dragon)
1791 or 1410 or 638

Events change