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| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1642 by topic |
|---|
| Arts and science |
| Leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Works category |
| Gregorian calendar | 1642 MDCXLII |
| Ab urbe condita | 2395 |
| Armenian calendar | 1091 ԹՎ ՌՂԱ |
| Assyrian calendar | 6392 |
| Balinese saka calendar | 1563–1564 |
| Bengali calendar | 1049 |
| Berber calendar | 2592 |
| English Regnal year | 17 Cha. 1 – 18 Cha. 1 |
| Buddhist calendar | 2186 |
| Burmese calendar | 1004 |
| Byzantine calendar | 7150–7151 |
| Chinese calendar | 辛巳年 (Metal Snake) 4339 or 4132 — to — 壬午年 (Water Horse) 4340 or 4133 |
| Coptic calendar | 1358–1359 |
| Discordian calendar | 2808 |
| Ethiopian calendar | 1634–1635 |
| Hebrew calendar | 5402–5403 |
| Hindu calendars | |
| - Vikram Samvat | 1698–1699 |
| - Shaka Samvat | 1563–1564 |
| - Kali Yuga | 4742–4743 |
| Holocene calendar | 11642 |
| Igbo calendar | 642–643 |
| Iranian calendar | 1020–1021 |
| Islamic calendar | 1051–1052 |
| Japanese calendar | Kan'ei 19 (寛永１９年) |
| Javanese calendar | 1563–1564 |
| Julian calendar | Gregorian minus 10 days |
| Korean calendar | 3975 |
| Minguo calendar | 270 before ROC 民前270年 |
| Nanakshahi calendar | 174 |
| Thai solar calendar | 2184–2185 |
| Tibetan calendar | 阴金蛇年 (female Iron-Snake) 1768 or 1387 or 615 — to — 阳水马年 (male Water-Horse) 1769 or 1388 or 616 |
1642 (MDCXLII) was a common year starting on Wednesday of the Gregorian calendar and a common year starting on Saturday of the Julian calendar, the 1642nd year of the Common Era (CE) and Anno Domini (AD) designations, the 642nd year of the 2nd millennium, the 42nd year of the 17th century, and the 3rd year of the 1640s decade. As of the start of 1642, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.