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Millennium: 2nd millennium
1901 by topic:
By country
Birth and death categories
Establishments and disestablishments categories
Works and introductions categories
1901 in various calendars
Gregorian calendar 1901
Ab urbe condita 2654
Armenian calendar 1350
Assyrian calendar 6651
Bahá'í calendar 57–58
Bengali calendar 1308
Berber calendar 2851
British Regnal year 64 Vict. 1 – 1 Edw. 7
Buddhist calendar 2445
Burmese calendar 1263
Byzantine calendar 7409–7410
Chinese calendar 庚子(Metal Rat)
4597 or 4537
    — to —
辛丑年 (Metal Ox)
4598 or 4538
Coptic calendar 1617–1618
Discordian calendar 3067
Ethiopian calendar 1893–1894
Hebrew calendar 5661–5662
Hindu calendars
 - Vikram Samvat 1957–1958
 - Shaka Samvat 1822–1823
 - Kali Yuga 5001–5002
Holocene calendar 11901
Igbo calendar 901–902
Iranian calendar 1279–1280
Islamic calendar 1318–1319
Japanese calendar Meiji 34
Javanese calendar 1830–1831
Julian calendar Gregorian minus 13 days
Korean calendar 4234
Minguo calendar 11 before ROC
Nanakshahi calendar 433
Thai solar calendar 2443–2444

1901 (MCMI) was a common year starting on Tuesday (dominical letter F) of the Gregorian calendar and a common year starting on Monday (dominical letter G) of the Julian calendar, the 1901st year of the Common Era (CE) and Anno Domini (AD) designations, the 901st year of the 2nd millennium, the 1st year of the 20th century, and the 2nd year of the 1900s decade. As of the start of 1901, the Gregorian calendar was 13 days ahead of the Julian calendar, which remained in localized use until 1923.

The date of Friday December 13 20:45:52 1901 is significant for modern computers because it is the earliest date representable with a signed 32-bit integer on systems that reference time in seconds since the Unix epoch. This corresponds to -2147483648 seconds from Thursday January 1 00:00:00 1970. For the same reason, many computers are also unable to represent an earlier date. For related reasons, many computer systems suffer from the Year 2038 problem. This is when the positive number of seconds since 1970 exceeds 2147483647 (01111111 11111111 11111111 11111111 in binary) and wraps to -2147483648. Hence the computer system erroneously displays or operates on the time Friday December 13 20:45:52 1901. In this way, the year 1900 is to the Year 2000 problem as the year 1901 is to the Year 2038 problem.