| Millennium: | 2nd millennium |
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| Centuries: | |
| Decades: | |
| Years: |
| 1945 by topic |
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| Subject |
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| By country |
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| Lists of leaders |
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| Gregorian calendar | 1945 MCMXLV |
| Ab urbe condita | 2698 |
| Armenian calendar | 1394 ԹՎ ՌՅՂԴ |
| Assyrian calendar | 6695 |
| Baháʼí calendar | 101–102 |
| Balinese saka calendar | 1866–1867 |
| Bengali calendar | 1352 |
| Berber calendar | 2895 |
| British Regnal year | 9 Geo. 6 – 10 Geo. 6 |
| Buddhist calendar | 2489 |
| Burmese calendar | 1307 |
| Byzantine calendar | 7453–7454 |
| Chinese calendar | 甲申年 (Wood Monkey) 4642 or 4435 — to — 乙酉年 (Wood Rooster) 4643 or 4436 |
| Coptic calendar | 1661–1662 |
| Discordian calendar | 3111 |
| Ethiopian calendar | 1937–1938 |
| Hebrew calendar | 5705–5706 |
| Hindu calendars | |
| - Vikram Samvat | 2001–2002 |
| - Shaka Samvat | 1866–1867 |
| - Kali Yuga | 5045–5046 |
| Holocene calendar | 11945 |
| Igbo calendar | 945–946 |
| Iranian calendar | 1323–1324 |
| Islamic calendar | 1364–1365 |
| Japanese calendar | Shōwa 20 (昭和２０年) |
| Javanese calendar | 1875–1876 |
| Juche calendar | 34 |
| Julian calendar | Gregorian minus 13 days |
| Korean calendar | 4278 |
| Minguo calendar | ROC 34 民國34年 |
| Nanakshahi calendar | 477 |
| Thai solar calendar | 2488 |
| Tibetan calendar | 阳木猴年 (male Wood-Monkey) 2071 or 1690 or 918 — to — 阴木鸡年 (female Wood-Rooster) 2072 or 1691 or 919 |
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1945 (MCMXLV) was a common year starting on Monday of the Gregorian calendar, the 1945th year of the Common Era (CE) and Anno Domini (AD) designations, the 945th year of the 2nd millennium, the 45th year of the 20th century, and the 6th year of the 1940s decade.
1945 marked the end of World War II and the fall of Nazi Germany and the Empire of Japan. It is also the year concentration camps were liberated and the only year in which atomic weapons have been used in combat.