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1904 in other calendars
Gregorian calendar	1904; MCMIV
Ab urbe condita	2657
Armenian calendar	1353; ԹՎ ՌՅԾԳ
Assyrian calendar	6654
Bahá'í calendar	60–61
Balinese saka calendar	1825–1826
Bengali calendar	1311
Berber calendar	2854
British Regnal year	3 Edw. 7 – 4 Edw. 7
Buddhist calendar	2448
Burmese calendar	1266
Byzantine calendar	7412–7413
Chinese calendar	癸卯年 (Water Rabbit); 4600 or 4540; — to —; 甲辰年 (Wood Dragon); 4601 or 4541
Coptic calendar	1620–1621
Discordian calendar	3070
Ethiopian calendar	1896–1897
Hebrew calendar	5664–5665
Hindu calendars
- Vikram Samvat	1960–1961
- Shaka Samvat	1825–1826
- Kali Yuga	5004–5005
Holocene calendar	11904
Igbo calendar	904–905
Iranian calendar	1282–1283
Islamic calendar	1321–1322
Japanese calendar	Meiji 37; (明治３７年)
Javanese calendar	1833–1834
Julian calendar	Gregorian minus 13 days
Korean calendar	4237
Minguo calendar	8 before ROC; 民前8年
Nanakshahi calendar	436
Thai solar calendar	2446–2447
Tibetan calendar	阴水兔年; (female Water-Rabbit); 2030 or 1649 or 877; — to —; 阳木龙年; (male Wood-Dragon); 2031 or 1650 or 878

Millennium:	2nd millennium
Centuries:	19th century – 20th century – 21st century
Decades:	1870s 1880s 1890s – 1900s – 1910s 1920s 1930s
Years:	1901 1902 1903 – 1904 – 1905 1906 1907

1904 (MCMIV) was a leap year starting on Friday of the Gregorian calendar and a leap year starting on Thursday of the Julian calendar, the 1904th year of the Common Era (CE) and Anno Domini (AD) designations, the 904th year of the 2nd millennium, the 4th year of the 20th century, and the 5th year of the 1900s decade. As of the start of 1904, the Gregorian calendar was 13 days ahead of the Julian calendar, which remained in localized use until 1923.

Events

January 4 – In Gonzales v. Williams, the U.S. Supreme Court decided that citizens of Puerto Rico are not aliens and could enter the United States freely.