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.
1900 in various calendars
1900
MCM
2653
1349
ԹՎ ՌՅԽԹ
6650
56–57
1821–1822
1307
2850
2444
1262
7408–7409
己亥年 (Earth Pig)
4597 or 4390
— to —
庚子年 (Metal Rat)
4598 or 4391
1616–1617
3066
1892–1893
5660–5661
1956–1957
1821–1822
5000–5001
11900
900–901
1278–1279
1317–1318
Meiji33
(明治33年)
1829–1830
Gregorian minus 12 or 13 days
4233
12 before ROC
民前12年
432
2442–2443
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
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.
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