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1638 (MDCXXXVIII) was a common year starting on Friday of the Gregorian calendar and a common year starting on Monday of the Julian calendar, the 1638th year of the Common Era (CE) and Anno Domini (AD) designations, the 638th year of the 2nd millennium, the 38th year of the 17th century, and the 9th year of the 1630s decade. As of the start of 1638, the…
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| 1638 | - Kali Yuga | 4738–4739 | 1.00 | infobox |
| 1638 | - Shaka Samvat | 1559–1560 | 1.00 | infobox |
| 1638 | - Vikram Samvat | 1694–1695 | 1.00 | infobox |
| 1638 | Ab urbe condita | 2391 | 1.00 | infobox |
| 1638 | Armenian calendar | 1087 ԹՎ ՌՁԷ | 1.00 | infobox |
| 1638 | Assyrian calendar | 6388 | 1.00 | infobox |
| 1638 | Balinese saka calendar | 1559–1560 | 1.00 | infobox |
| 1638 | Bengali calendar | 1044–1045 | 1.00 | infobox |
| 1638 | Berber calendar | 2588 | 1.00 | infobox |
| 1638 | Buddhist calendar | 2182 | 1.00 | infobox |
| 1638 | Burmese calendar | 1000 | 1.00 | infobox |
| 1638 | Byzantine calendar | 7146–7147 | 1.00 | infobox |
| 1638 | Chinese calendar | 丁丑年 (Fire Ox) 4335 or 4128 — to — 戊寅年 (Earth Tiger) 4336 or 4129 | 1.00 | infobox |
| 1638 | Coptic calendar | 1354–1355 | 1.00 | infobox |
| 1638 | Discordian calendar | 2804 | 1.00 | infobox |
| 1638 | English Regnal year | 13 Cha. 1 – 14 Cha. 1 | 1.00 | infobox |
| 1638 | Ethiopian calendar | 1630–1631 | 1.00 | infobox |
| 1638 | Gregorian calendar | 1638 MDCXXXVIII | 1.00 | infobox |
| 1638 | Hebrew calendar | 5398–5399 | 1.00 | infobox |
| 1638 | Holocene calendar | 11638 | 1.00 | infobox |
| 1638 | Igbo calendar | 638–639 | 1.00 | infobox |
| 1638 | Iranian calendar | 1016–1017 | 1.00 | infobox |
| 1638 | Islamic calendar | 1047–1048 | 1.00 | infobox |
| 1638 | Japanese calendar | Kan'ei 15 (寛永15年) | 1.00 | infobox |
| 1638 | Javanese calendar | 1559–1560 | 1.00 | infobox |
| 1638 | Julian calendar | Gregorian minus 10 days | 1.00 | infobox |
| 1638 | Korean calendar | 3971 | 1.00 | infobox |
| 1638 | Minguo calendar | 274 before ROC 民前274年 | 1.00 | infobox |
| 1638 | Nanakshahi calendar | 170 | 1.00 | infobox |
| 1638 | Thai solar calendar | 2180–2181 | 1.00 | infobox |
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