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1778 (MDCCLXXVIII) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Monday of the Julian calendar, the 1778th year of the Common Era (CE) and Anno Domini (AD) designations, the 778th year of the 2nd millennium, the 78th year of the 18th century, and the 9th year of the 1770s decade. As of the start of 1778, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.

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Millennium: 2nd millennium
Centuries:
Decades:
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1778 in various calendars
Gregorian calendar1778
MDCCLXXVIII
Ab urbe condita2531
Armenian calendar1227
ԹՎ ՌՄԻԷ
Assyrian calendar6528
Balinese saka calendar1699–1700
Bengali calendar1185
Berber calendar2728
British Regnal year18 Geo. 3  19 Geo. 3
Buddhist calendar2322
Burmese calendar1140
Byzantine calendar7286–7287
Chinese calendar丁酉年 (Fire Rooster)
4474 or 4414
     to 
戊戌年 (Earth Dog)
4475 or 4415
Coptic calendar1494–1495
Discordian calendar2944
Ethiopian calendar1770–1771
Hebrew calendar5538–5539
Hindu calendars
 - Vikram Samvat1834–1835
 - Shaka Samvat1699–1700
 - Kali Yuga4878–4879
Holocene calendar11778
Igbo calendar778–779
Iranian calendar1156–1157
Islamic calendar1191–1192
Japanese calendarAn'ei 7
(安永7年)
Javanese calendar1703–1704
Julian calendarGregorian minus 11 days
Korean calendar4111
Minguo calendar134 before ROC
民前134年
Nanakshahi calendar310
Thai solar calendar2320–2321
Tibetan calendar阴火鸡年
(female Fire-Rooster)
1904 or 1523 or 751
     to 
阳土狗年
(male Earth-Dog)
1905 or 1524 or 752
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June 28: Battle of Monmouth