640 BC
| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 640 BC DCXXXIX BC |
| Ab urbe condita | 114 |
| Ancient Egypt era | XXVI dynasty, 25 |
| - Pharaoh | Psamtik I, 25 |
| Ancient Greek era | 35th Olympiad (victor)¹ |
| Assyrian calendar | 4111 |
| Bengali calendar | −1232 |
| Berber calendar | 311 |
| Buddhist calendar | −95 |
| Burmese calendar | −1277 |
| Byzantine calendar | 4869–4870 |
| Chinese calendar |
庚辰年 (Metal Dragon) 2057 or 1997 — to — 辛巳年 (Metal Snake) 2058 or 1998 |
| Coptic calendar | −923 – −922 |
| Discordian calendar | 527 |
| Ethiopian calendar | −647 – −646 |
| Hebrew calendar | 3121–3122 |
| Hindu calendars | |
| - Vikram Samvat | −583 – −582 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2461–2462 |
| Holocene calendar | 9361 |
| Iranian calendar | 1261 BP – 1260 BP |
| Islamic calendar | 1300 BH – 1299 BH |
| Javanese calendar | N/A |
| Julian calendar | N/A |
| Korean calendar | 1694 |
| Minguo calendar | 2551 before ROC 民前2551年 |
| Nanakshahi calendar | −2107 |
| Thai solar calendar | −97 – −96 |
...
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