| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 684 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 684 DCLXXXIV |
| Ab urbe condita | 1437 |
| Armenian calendar | 133 ԹՎ ՃԼԳ |
| Assyrian calendar | 5434 |
| Balinese saka calendar | 605–606 |
| Bengali calendar | 91 |
| Berber calendar | 1634 |
| Buddhist calendar | 1228 |
| Burmese calendar | 46 |
| Byzantine calendar | 6192–6193 |
| Chinese calendar | 癸未年 (Water Goat) 3381 or 3174 — to — 甲申年 (Wood Monkey) 3382 or 3175 |
| Coptic calendar | 400–401 |
| Discordian calendar | 1850 |
| Ethiopian calendar | 676–677 |
| Hebrew calendar | 4444–4445 |
| Hindu calendars | |
| - Vikram Samvat | 740–741 |
| - Shaka Samvat | 605–606 |
| - Kali Yuga | 3784–3785 |
| Holocene calendar | 10684 |
| Iranian calendar | 62–63 |
| Islamic calendar | 64–65 |
| Japanese calendar | Hakuchi 35 (白雉３５年) |
| Javanese calendar | 576–577 |
| Julian calendar | 684 DCLXXXIV |
| Korean calendar | 3017 |
| Minguo calendar | 1228 before ROC 民前1228年 |
| Nanakshahi calendar | −784 |
| Seleucid era | 995/996 AG |
| Thai solar calendar | 1226–1227 |
| Tibetan calendar | 阴水羊年 (female Water-Goat) 810 or 429 or −343 — to — 阳木猴年 (male Wood-Monkey) 811 or 430 or −342 |
Year 684 (DCLXXXIV) was a leap year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 684 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.