Year 2000 problem  

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Train wreck at Montparnasse (October 22, 1895) by Studio Lévy and Sons.
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Train wreck at Montparnasse (October 22, 1895) by Studio Lévy and Sons.

The Year 2000 problem, also known as the Y2K problem, the Millennium bug, the Y2K bug, or Y2K, is a class of computer bugs related to the formatting and storage of calendar data for dates beginning in the year 2000. Problems were anticipated, and arose, because many programs represented four-digit years with only the final two digits — making the year 2000 indistinguishable from 1900. The assumption of a twentieth-century date in such programs could cause various errors, such as the incorrect display of dates and the inaccurate ordering of automated dated records or real-time events.

See also

  • The Deep Impact space mission was lost when its internal clock reached exactly 232 one-tenth seconds since 2000 on 11 August 2013, 00:38:49.
  • IPv4 address exhaustion, problems caused by the limited allocation size for numeric internet addresses
  • ISO 8601, an international standard for representing dates and times, which mandates the use of (at least) four digits for the year
  • Perpetual calendar, a calendar valid for many years, including before and after 2000
  • Year 10,000 problem, about computer software that cannot accept five digit years
  • YEAR2000, a configuration setting supported by some versions of DR-DOS to overcome Year 2000 BIOS bugs
  • 512k day: an event in 2014, involving a software limitation in network routers.




Unless indicated otherwise, the text in this article is either based on Wikipedia article "Year 2000 problem" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on original research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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