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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.

Quick facts: Millennium , Centuries , Decades , Years ...
Millennium: 2nd millennium
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1900 in various calendars
Gregorian calendar1900
Ab urbe condita2653
Armenian calendar1349
Assyrian calendar6650
Baháʼí calendar56–57
Balinese saka calendar1821–1822
Bengali calendar1307
Berber calendar2850
British Regnal year63 Vict. 1  64 Vict. 1
Buddhist calendar2444
Burmese calendar1262
Byzantine calendar7408–7409
Chinese calendar己亥年 (Earth Pig)
4596 or 4536
庚子年 (Metal Rat)
4597 or 4537
Coptic calendar1616–1617
Discordian calendar3066
Ethiopian calendar1892–1893
Hebrew calendar5660–5661
Hindu calendars
 - Vikram Samvat1956–1957
 - Shaka Samvat1821–1822
 - Kali Yuga5000–5001
Holocene calendar11900
Igbo calendar900–901
Iranian calendar1278–1279
Islamic calendar1317–1318
Japanese calendarMeiji 33
Javanese calendar1829–1830
Julian calendarGregorian minus 12 or 13 days
Korean calendar4233
Minguo calendar12 before ROC
Nanakshahi calendar432
Thai solar calendar2442–2443
Tibetan calendar阴土猪年
(female Earth-Pig)
2026 or 1645 or 873
(male Iron-Rat)
2027 or 1646 or 874

As of March 1 (O.S. February 17), when the Julian calendar acknowledged a leap day and the Gregorian calendar did not, 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.