640
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 640 DCXL |
| Ab urbe condita | 1393 |
| Armenian calendar | 89 ԹՎ ՁԹ |
| Assyrian calendar | 5390 |
| Bengali calendar | 47 |
| Berber calendar | 1590 |
| Buddhist calendar | 1184 |
| Burmese calendar | 2 |
| Byzantine calendar | 6148–6149 |
| Chinese calendar |
己亥年 (Earth Pig) 3336 or 3276 — to — 庚子年 (Metal Rat) 3337 or 3277 |
| Coptic calendar | 356–357 |
| Discordian calendar | 1806 |
| Ethiopian calendar | 632–633 |
| Hebrew calendar | 4400–4401 |
| Hindu calendars | |
| - Vikram Samvat | 696–697 |
| - Shaka Samvat | 561–562 |
| - Kali Yuga | 3740–3741 |
| Holocene calendar | 10640 |
| Iranian calendar | 18–19 |
| Islamic calendar | 19–20 |
| Japanese calendar | N/A |
| Javanese calendar | 530–531 |
| Julian calendar | 640 DCXL |
| Korean calendar | 2973 |
| Minguo calendar | 1272 before ROC 民前1272年 |
| Nanakshahi calendar | −828 |
| Seleucid era | 951/952 AG |
| Thai solar calendar | 1182–1183 |
Year 640 (DCXL) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar. The denomination 640 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.
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