638
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 638 DCXXXVIII |
| Ab urbe condita | 1391 |
| Armenian calendar | 87 ԹՎ ՁԷ |
| Assyrian calendar | 5388 |
| Bengali calendar | 45 |
| Berber calendar | 1588 |
| Buddhist calendar | 1182 |
| Burmese calendar | 0 |
| Byzantine calendar | 6146–6147 |
| Chinese calendar |
丁酉年 (Fire Rooster) 3334 or 3274 — to — 戊戌年 (Earth Dog) 3335 or 3275 |
| Coptic calendar | 354–355 |
| Discordian calendar | 1804 |
| Ethiopian calendar | 630–631 |
| Hebrew calendar | 4398–4399 |
| Hindu calendars | |
| - Vikram Samvat | 694–695 |
| - Shaka Samvat | 559–560 |
| - Kali Yuga | 3738–3739 |
| Holocene calendar | 10638 |
| Iranian calendar | 16–17 |
| Islamic calendar | 16–17 |
| Japanese calendar | N/A |
| Javanese calendar | 528–529 |
| Julian calendar | 638 DCXXXVIII |
| Korean calendar | 2971 |
| Minguo calendar | 1274 before ROC 民前1274年 |
| Nanakshahi calendar | −830 |
| Seleucid era | 949/950 AG |
| Thai solar calendar | 1180–1181 |
Year 638 (DCXXXVIII) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. The denomination 638 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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