| Millennium: | 1st millennium |
|---|---|
| Centuries: | 8th century – 9th century – 10th century |
| Decades: | 830s 840s 850s – 860s – 870s 880s 890s |
| Years: | 861 862 863 – 864 – 865 866 867 |
| 864 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 864 DCCCLXIV |
| Ab urbe condita | 1617 |
| Armenian calendar | 313 ԹՎ ՅԺԳ |
| Bahá'í calendar | -980 – -979 |
| Bengali calendar | 271 |
| Berber calendar | 1814 |
| Buddhist calendar | 1408 |
| Burmese calendar | 226 |
| Byzantine calendar | 6372 – 6373 |
| Chinese calendar | 癸未年十一月十八日 (3500/3560-11-18) — to —
甲申年十一月廿九日(3501/3561-11-29) |
| Coptic calendar | 580 – 581 |
| Ethiopian calendar | 856 – 857 |
| Hebrew calendar | 4624 – 4625 |
| Hindu calendars | |
| - Bikram Samwat | 920 – 921 |
| - Shaka Samvat | 786 – 787 |
| - Kali Yuga | 3965 – 3966 |
| Holocene calendar | 10864 |
| Iranian calendar | 242 – 243 |
| Islamic calendar | 249 – 250 |
| Japanese calendar | |
| Korean calendar | 3197 |
| Thai solar calendar | 1407 |