Back 1900 Abkhazian 1900 Afrikaans 1900 ALS 1900 јыл ALT 1900 እ.ኤ.አ. Amharic 1900 AN 1900 Arabic 1900 ARY 1900 ARZ 1900 AST
| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1900 by topic |
|---|
| Humanities |
| By country |
| Other topics |
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | 1900 MCM |
| Ab urbe condita | 2653 |
| Armenian calendar | 1349 ԹՎ ՌՅԽԹ |
| Assyrian calendar | 6650 |
| Baháʼí calendar | 56–57 |
| Balinese saka calendar | 1821–1822 |
| Bengali calendar | 1307 |
| Berber calendar | 2850 |
| British Regnal year | 63 Vict. 1 – 64 Vict. 1 |
| Buddhist calendar | 2444 |
| Burmese calendar | 1262 |
| Byzantine calendar | 7408–7409 |
| Chinese calendar | 己亥年 (Earth Pig) 4597 or 4390 — to — 庚子年 (Metal Rat) 4598 or 4391 |
| Coptic calendar | 1616–1617 |
| Discordian calendar | 3066 |
| Ethiopian calendar | 1892–1893 |
| Hebrew calendar | 5660–5661 |
| Hindu calendars | |
| - Vikram Samvat | 1956–1957 |
| - Shaka Samvat | 1821–1822 |
| - Kali Yuga | 5000–5001 |
| Holocene calendar | 11900 |
| Igbo calendar | 900–901 |
| Iranian calendar | 1278–1279 |
| Islamic calendar | 1317–1318 |
| Japanese calendar | Meiji 33 (明治３３年) |
| Javanese calendar | 1829–1830 |
| Julian calendar | Gregorian minus 12 or 13 days |
| Korean calendar | 4233 |
| Minguo calendar | 12 before ROC 民前12年 |
| Nanakshahi calendar | 432 |
| Thai solar calendar | 2442–2443 |
| Tibetan calendar | 阴土猪年 (female Earth-Pig) 2026 or 1645 or 873 — to — 阳金鼠年 (male Iron-Rat) 2027 or 1646 or 874 |
1900 (MCM) was an exceptional common year starting on Monday of the Gregorian calendar and a leap year starting on Saturday of the Julian calendar, the 1900th year of the Common Era (CE) and Anno Domini (AD) designations, the 900th year of the 2nd millennium, the 100th and last year of the 19th century, and the 1st year of the 1900s decade. As of the start of 1900, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
As of March 1 (O.S. February 17), when the Julian calendar acknowledged a leap day and the Gregorian calendar did not (which will not occur again until 2100), the Julian calendar fell one day further behind, bringing the difference to 13 days until February 28 (O.S. February 15), 2100. The year 1900 also marked the Year of the Rat on the Chinese calendar.