1678 (MDCLXXVIII) was a common year starting on Saturday of the Gregorian calendar and a common year starting on Tuesday of the Julian calendar, the 1678th year of the Common Era (CE) and Anno Domini (AD) designations, the 678th year of the 2nd millennium, the 78th year of the 17th century, and the 9th year of the 1670s decade. As of the start of 1678, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.

August 1415: Battle of Saint-Denis
Millennium: 2nd millennium
1678 in various calendars
Gregorian calendar1678
Ab urbe condita2431
Armenian calendar1127
Assyrian calendar6428
Balinese saka calendar1599–1600
Bengali calendar1085
Berber calendar2628
English Regnal year29 Cha. 2  30 Cha. 2
Buddhist calendar2222
Burmese calendar1040
Byzantine calendar7186–7187
Chinese calendar丁巳年 (Fire Snake)
4374 or 4314
戊午年 (Earth Horse)
4375 or 4315
Coptic calendar1394–1395
Discordian calendar2844
Ethiopian calendar1670–1671
Hebrew calendar5438–5439
Hindu calendars
 - Vikram Samvat1734–1735
 - Shaka Samvat1599–1600
 - Kali Yuga4778–4779
Holocene calendar11678
Igbo calendar678–679
Iranian calendar1056–1057
Islamic calendar1088–1089
Japanese calendarEnpō 6
Javanese calendar1600–1601
Julian calendarGregorian minus 10 days
Korean calendar4011
Minguo calendar234 before ROC
Nanakshahi calendar210
Thai solar calendar2220–2221
Tibetan calendar阴火蛇年
(female Fire-Snake)
1804 or 1423 or 651
(male Earth-Horse)
1805 or 1424 or 652

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