Millennium: 2nd millennium
2000 in various calendars
Gregorian calendar2000
Ab urbe condita2753
Armenian calendar1449
Assyrian calendar6750
Bahá'í calendar156–157
Balinese saka calendar1921–1922
Bengali calendar1407
Berber calendar2950
British Regnal year48 Eliz. 2 – 49 Eliz. 2
Buddhist calendar2544
Burmese calendar1362
Byzantine calendar7508–7509
Chinese calendar己卯(Earth Rabbit)
4696 or 4636
    — to —
庚辰年 (Metal Dragon)
4697 or 4637
Coptic calendar1716–1717
Discordian calendar3166
Ethiopian calendar1992–1993
Hebrew calendar5760–5761
Hindu calendars
 - Vikram Samvat2056–2057
 - Shaka Samvat1921–1922
 - Kali Yuga5100–5101
Holocene calendar12000
Igbo calendar1000–1001
Iranian calendar1378–1379
Islamic calendar1420–1421
Japanese calendarHeisei 12
Javanese calendar1932–1933
Juche calendar89
Julian calendarGregorian minus 13 days
Korean calendar4333
Minguo calendarROC 89
Nanakshahi calendar532
Thai solar calendar2543
Tibetan calendar阴土兔年
(female Earth-Rabbit)
2126 or 1745 or 973
    — to —
(male Iron-Dragon)
2127 or 1746 or 974
Unix time946684800 – 978307199

2000 (MM) was a century leap year starting on Saturday 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 the International Year for the Culture of Peace[1] and the World Mathematical Year.[2]

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 the year AD 1. Since the Gregorian 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. (More further information, see century and millennium.)

The year 2000 is sometimes abbreviated as "Y2K" (the "Y" stands for "year", and the "K" stands for "kilo" which means "thousand").[3][4] The year 2000 was the subject of Y2K concerns, which were 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.