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| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
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| 1670 by topic |
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| Arts and science |
| Leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Works category |
| Gregorian calendar | 1670 MDCLXX |
| Ab urbe condita | 2423 |
| Armenian calendar | 1119 ԹՎ ՌՃԺԹ |
| Assyrian calendar | 6420 |
| Balinese saka calendar | 1591–1592 |
| Bengali calendar | 1077 |
| Berber calendar | 2620 |
| English Regnal year | 21 Cha. 2 – 22 Cha. 2 |
| Buddhist calendar | 2214 |
| Burmese calendar | 1032 |
| Byzantine calendar | 7178–7179 |
| Chinese calendar | 己酉年 (Earth Rooster) 4367 or 4160 — to — 庚戌年 (Metal Dog) 4368 or 4161 |
| Coptic calendar | 1386–1387 |
| Discordian calendar | 2836 |
| Ethiopian calendar | 1662–1663 |
| Hebrew calendar | 5430–5431 |
| Hindu calendars | |
| - Vikram Samvat | 1726–1727 |
| - Shaka Samvat | 1591–1592 |
| - Kali Yuga | 4770–4771 |
| Holocene calendar | 11670 |
| Igbo calendar | 670–671 |
| Iranian calendar | 1048–1049 |
| Islamic calendar | 1080–1081 |
| Japanese calendar | Kanbun 10 (寛文１０年) |
| Javanese calendar | 1592–1593 |
| Julian calendar | Gregorian minus 10 days |
| Korean calendar | 4003 |
| Minguo calendar | 242 before ROC 民前242年 |
| Nanakshahi calendar | 202 |
| Thai solar calendar | 2212–2213 |
| Tibetan calendar | 阴土鸡年 (female Earth-Rooster) 1796 or 1415 or 643 — to — 阳金狗年 (male Iron-Dog) 1797 or 1416 or 644 |
1670 (MDCLXX) was a common year starting on Wednesday of the Gregorian calendar and a common year starting on Saturday of the Julian calendar, the 1670th year of the Common Era (CE) and Anno Domini (AD) designations, the 670th year of the 2nd millennium, the 70th year of the 17th century, and the 1st year of the 1670s decade. As of the start of 1670, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.