| Millennium: | 1st millennium |
|---|---|
| Centuries: | 6th century – 7th century – 8th century |
| Decades: | 650s 660s 670s – 680s – 690s 700s 710s |
| Years: | 681 682 683 – 684 – 685 686 687 |
| 684 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 684 DCLXXXIV |
| Ab urbe condita | 1437 |
| Armenian calendar | 133 ԹՎ ՃԼԳ |
| Bahá'í calendar | -1160 – -1159 |
| Bengali calendar | 91 |
| Berber calendar | 1634 |
| Buddhist calendar | 1228 |
| Burmese calendar | 46 |
| Byzantine calendar | 6192 – 6193 |
| Chinese calendar | 癸未年十二月初九日 (3320/3380-12-9) — to —
甲申年十一月二十日(3321/3381-11-20) |
| Coptic calendar | 400 – 401 |
| Ethiopian calendar | 676 – 677 |
| Hebrew calendar | 4444 – 4445 |
| Hindu calendars | |
| - Bikram Samwat | 740 – 741 |
| - Shaka Samvat | 606 – 607 |
| - Kali Yuga | 3785 – 3786 |
| Holocene calendar | 10684 |
| Iranian calendar | 62 – 63 |
| Islamic calendar | 64 – 65 |
| Japanese calendar | |
| Korean calendar | 3017 |
| Thai solar calendar | 1227 |