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Millennium: 2nd millennium
2000 by topic:
By country
Birth and death categories
Establishments and disestablishments categories
Works and introductions categories
2000 in various calendars
Gregorian calendar 2000
Ab urbe condita 2753
Armenian calendar 1449
Assyrian calendar 6750
Bahá'í calendar 156–157
Bengali calendar 1407
Berber calendar 2950
British Regnal year 48 Eliz. 2 – 49 Eliz. 2
Buddhist calendar 2544
Burmese calendar 1362
Byzantine calendar 7508–7509
Chinese calendar 己卯(Earth Rabbit)
4696 or 4636
    — to —
庚辰年 (Metal Dragon)
4697 or 4637
Coptic calendar 1716–1717
Discordian calendar 3166
Ethiopian calendar 1992–1993
Hebrew calendar 5760–5761
Hindu calendars
 - Vikram Samvat 2056–2057
 - Shaka Samvat 1921–1922
 - Kali Yuga 5100–5101
Holocene calendar 12000
Igbo calendar 1000–1001
Iranian calendar 1378–1379
Islamic calendar 1420–1421
Japanese calendar Heisei 12
Javanese calendar 1932–1933
Juche calendar 89
Julian calendar Gregorian minus 13 days
Korean calendar 4333
Minguo calendar ROC 89
Nanakshahi calendar 532
Thai solar calendar 2543
Unix time 946684800 – 978307199

2000 (MM) was a century leap year starting on Saturday (dominical letter BA) of the Gregorian calendar, the 2000th year of the Common Era (CE) and Anno Domini (AD) designations, the 1000th and last year of the 2nd millennium, the 100th and last year of the 20th century, and the 1st year of the 2000s decade.

2000 was designated as:

Popular culture holds the year 2000 as the first year of the 21st century and the 3rd millennium due to a tendency of grouping the years according to decimal values, as if year zero were counted. According to the Gregorian Calendar, these distinctions fall to the year 2001 because the 1st century was retroactively said to start with year AD 1. Since the calendar does not have year zero, its first millennium spanned from years 1 to 1000 inclusively and its second millennium from years 1001 to 2000 (See more at Millennium).

The year 2000 is sometimes abbreviated as "Y2K" (the "Y" stands for "year", and the "K" stands for "kilo" which means "thousand"). The year 2000 was the subject of Y2K concerns, which are fears that computers would not shift from 1999 to 2000 correctly. However, by the end of 1999, many companies had already converted to new, or upgraded, existing software. Some even obtained Y2K certification. As a result of massive effort, relatively few problems occurred.