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| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1671 by topic |
|---|
| Arts and science |
| Leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Works category |
| Gregorian calendar | 1671 MDCLXXI |
| Ab urbe condita | 2424 |
| Armenian calendar | 1120 ԹՎ ՌՃԻ |
| Assyrian calendar | 6421 |
| Balinese saka calendar | 1592–1593 |
| Bengali calendar | 1078 |
| Berber calendar | 2621 |
| English Regnal year | 22 Cha. 2 – 23 Cha. 2 |
| Buddhist calendar | 2215 |
| Burmese calendar | 1033 |
| Byzantine calendar | 7179–7180 |
| Chinese calendar | 庚戌年 (Metal Dog) 4368 or 4161 — to — 辛亥年 (Metal Pig) 4369 or 4162 |
| Coptic calendar | 1387–1388 |
| Discordian calendar | 2837 |
| Ethiopian calendar | 1663–1664 |
| Hebrew calendar | 5431–5432 |
| Hindu calendars | |
| - Vikram Samvat | 1727–1728 |
| - Shaka Samvat | 1592–1593 |
| - Kali Yuga | 4771–4772 |
| Holocene calendar | 11671 |
| Igbo calendar | 671–672 |
| Iranian calendar | 1049–1050 |
| Islamic calendar | 1081–1082 |
| Japanese calendar | Kanbun 11 (寛文１１年) |
| Javanese calendar | 1593–1594 |
| Julian calendar | Gregorian minus 10 days |
| Korean calendar | 4004 |
| Minguo calendar | 241 before ROC 民前241年 |
| Nanakshahi calendar | 203 |
| Thai solar calendar | 2213–2214 |
| Tibetan calendar | 阳金狗年 (male Iron-Dog) 1797 or 1416 or 644 — to — 阴金猪年 (female Iron-Pig) 1798 or 1417 or 645 |
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1671 (MDCLXXI) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1671st year of the Common Era (CE) and Anno Domini (AD) designations, the 671st year of the 2nd millennium, the 71st year of the 17th century, and the 2nd year of the 1670s decade. As of the start of 1671, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.