| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1784 by topic |
|---|
| Arts and science |
| Countries |
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | 1784 MDCCLXXXIV |
| Ab urbe condita | 2537 |
| Armenian calendar | 1233 ԹՎ ՌՄԼԳ |
| Assyrian calendar | 6534 |
| Balinese saka calendar | 1705–1706 |
| Bengali calendar | 1191 |
| Berber calendar | 2734 |
| British Regnal year | 24 Geo. 3 – 25 Geo. 3 |
| Buddhist calendar | 2328 |
| Burmese calendar | 1146 |
| Byzantine calendar | 7292–7293 |
| Chinese calendar | 癸卯年 (Water Rabbit) 4481 or 4274 — to — 甲辰年 (Wood Dragon) 4482 or 4275 |
| Coptic calendar | 1500–1501 |
| Discordian calendar | 2950 |
| Ethiopian calendar | 1776–1777 |
| Hebrew calendar | 5544–5545 |
| Hindu calendars | |
| - Vikram Samvat | 1840–1841 |
| - Shaka Samvat | 1705–1706 |
| - Kali Yuga | 4884–4885 |
| Holocene calendar | 11784 |
| Igbo calendar | 784–785 |
| Iranian calendar | 1162–1163 |
| Islamic calendar | 1198–1199 |
| Japanese calendar | Tenmei 4 (天明４年) |
| Javanese calendar | 1710–1711 |
| Julian calendar | Gregorian minus 11 days |
| Korean calendar | 4117 |
| Minguo calendar | 128 before ROC 民前128年 |
| Nanakshahi calendar | 316 |
| Thai solar calendar | 2326–2327 |
| Tibetan calendar | 阴水兔年 (female Water-Rabbit) 1910 or 1529 or 757 — to — 阳木龙年 (male Wood-Dragon) 1911 or 1530 or 758 |
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1784 (MDCCLXXXIV) was a leap year starting on Thursday of the Gregorian calendar and a leap year starting on Monday of the Julian calendar, the 1784th year of the Common Era (CE) and Anno Domini (AD) designations, the 784th year of the 2nd millennium, the 84th year of the 18th century, and the 5th year of the 1780s decade. As of the start of 1784, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.