| Millennium: | 1st Millennium BC |
|---|---|
| Centuries: | 10th cent. BC – 9th cent. BC – 8th cent. BC |
| Decades: | 900s BC 890s BC 880s BC – 870s BC – 860s BC 850s BC 840s BC |
| Years: | 873 BC 872 BC 871 BC – 870 BC – 869 BC 868 BC 867 BC |
| Gregorian calendar | 870 DCCCLXX |
| Ab urbe condita | 1623 |
| Armenian calendar | 319 ԹՎ ՅԺԹ |
| Assyrian calendar | 5620 |
| Bengali calendar | 277 |
| Berber calendar | 1820 |
| Buddhist calendar | 1414 |
| Burmese calendar | 232 |
| Byzantine calendar | 6378–6379 |
| Chinese calendar | 己丑年 (Earth Ox) 3566 or 3506 — to — 庚寅年 (Metal Tiger) 3567 or 3507 |
| Coptic calendar | 586–587 |
| Discordian calendar | 2036 |
| Ethiopian calendar | 862–863 |
| Hebrew calendar | 4630–4631 |
| Hindu calendars | |
| - Vikram Samvat | 926–927 |
| - Shaka Samvat | 791–792 |
| - Kali Yuga | 3970–3971 |
| Holocene calendar | 10870 |
| Iranian calendar | 248–249 |
| Islamic calendar | 256–257 |
| Japanese calendar | Jōgan 12 (貞観１２年) |
| Javanese calendar | 767–768 |
| Julian calendar | 870 DCCCLXX |
| Korean calendar | 3203 |
| Minguo calendar | 1042 before ROC 民前1042年 |
| Nanakshahi calendar | −598 |
| Seleucid era | 1181/1182 AG |
| Thai solar calendar | 1412–1413 |
The year 870 BC