 | This article needs additional citations for verification. (May 2018) |
| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1621 by topic |
|---|
| Arts and science |
| Leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Works category |
| Gregorian calendar | 1621 MDCXXI |
| Ab urbe condita | 2374 |
| Armenian calendar | 1070 ԹՎ ՌՀ |
| Assyrian calendar | 6371 |
| Balinese saka calendar | 1542–1543 |
| Bengali calendar | 1028 |
| Berber calendar | 2571 |
| English Regnal year | 18 Ja. 1 – 19 Ja. 1 |
| Buddhist calendar | 2165 |
| Burmese calendar | 983 |
| Byzantine calendar | 7129–7130 |
| Chinese calendar | 庚申年 (Metal Monkey) 4318 or 4111 — to — 辛酉年 (Metal Rooster) 4319 or 4112 |
| Coptic calendar | 1337–1338 |
| Discordian calendar | 2787 |
| Ethiopian calendar | 1613–1614 |
| Hebrew calendar | 5381–5382 |
| Hindu calendars | |
| - Vikram Samvat | 1677–1678 |
| - Shaka Samvat | 1542–1543 |
| - Kali Yuga | 4721–4722 |
| Holocene calendar | 11621 |
| Igbo calendar | 621–622 |
| Iranian calendar | 999–1000 |
| Islamic calendar | 1030–1031 |
| Japanese calendar | Genna 7 (元和７年) |
| Javanese calendar | 1542–1543 |
| Julian calendar | Gregorian minus 10 days |
| Korean calendar | 3954 |
| Minguo calendar | 291 before ROC 民前291年 |
| Nanakshahi calendar | 153 |
| Thai solar calendar | 2163–2164 |
| Tibetan calendar | 阳金猴年 (male Iron-Monkey) 1747 or 1366 or 594 — to — 阴金鸡年 (female Iron-Rooster) 1748 or 1367 or 595 |
1621 (MDCXXI) was a common year starting on Friday of the Gregorian calendar and a common year starting on Monday of the Julian calendar, the 1621st year of the Common Era (CE) and Anno Domini (AD) designations, the 621st year of the 2nd millennium, the 21st year of the 17th century, and the 2nd year of the 1620s decade. As of the start of 1621, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.