1645
| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1645 by topic: | |
| Arts and Science | |
| Architecture - Art - Literature - Music - Science | |
| Lists of leaders | |
| State leaders – Colonial & territorial governors – Religious leaders | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| Works category | |
| Works | |
| Gregorian calendar | 1645 MDCXLV |
| Ab urbe condita | 2398 |
| Armenian calendar | 1094 ԹՎ ՌՂԴ |
| Assyrian calendar | 6395 |
| Bengali calendar | 1052 |
| Berber calendar | 2595 |
| English Regnal year | 20 Cha. 1 – 21 Cha. 1 |
| Buddhist calendar | 2189 |
| Burmese calendar | 1007 |
| Byzantine calendar | 7153–7154 |
| Chinese calendar |
甲申年 (Wood Monkey) 4341 or 4281 — to — 乙酉年 (Wood Rooster) 4342 or 4282 |
| Coptic calendar | 1361–1362 |
| Discordian calendar | 2811 |
| Ethiopian calendar | 1637–1638 |
| Hebrew calendar | 5405–5406 |
| Hindu calendars | |
| - Vikram Samvat | 1701–1702 |
| - Shaka Samvat | 1566–1567 |
| - Kali Yuga | 4745–4746 |
| Holocene calendar | 11645 |
| Igbo calendar | 645–646 |
| Iranian calendar | 1023–1024 |
| Islamic calendar | 1054–1055 |
| Japanese calendar |
Shōhō 2 (正保２年) |
| Javanese calendar | 1566–1567 |
| Julian calendar | Gregorian minus 10 days |
| Korean calendar | 3978 |
| Minguo calendar | 267 before ROC 民前267年 |
| Nanakshahi calendar | 177 |
| Thai solar calendar | 2187–2188 |
1645 (MDCXLV) was a common year starting on Sunday (dominical letter A) of the Gregorian calendar and a common year starting on Wednesday (dominical letter E) of the Julian calendar, the 1645th year of the Common Era (CE) and Anno Domini (AD) designations, the 645th year of the 2nd millennium, the 45th year of the 17th century, and the 6th year of the 1640s decade. As of the start of 1645, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.
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