Year 2000

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Year 2000

(programming)
(Y2K, or "millennium bug") A common name for all the difficulties the turn of the century, or dates in general, bring to computer users.

Back in the 1970s and 1980s, the turn of the century looked so remote and memory/disk was so expensive that most programs stored only the last two digits of the year. These produce surprising results when dealing with dates after 1999. They may believe that 1 January 2000 is before 31 December 1999 (00<99), they may miscalculate the day of week, etc. Some programs used the year 99 as a special marker; there are rumours that some car insurance policies were cancelled because a year of 99 was used to mark deleted records.

Complete testing of date-dependent code is virtually impossible, especially where the system under test relies on other systems such as customers' or suppliers' computers. Despite this, the predicted "millennium meltdown" never occurred. Various fixes and work-arounds were successfully applied, e.g. time shifting.

And yes, the year 2000 was a leap year (multiples of 100 aren't leap years unless they're also multiples of 400).

PPR Corp Y2K FAQ.
References in periodicals archive ?
Trend Micro is focused on enhancing the security of customers' Exchange 2000 messaging and collaboration infrastructure.
Xpedior is a finalist for this year's Microsoft's Best Exchange 2000 Solution by a Partner Award for the implementation of the World Bank's SEP portal solution.
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Cambridge, United Kingdom: Cambridge University Press, 2000, 588 pp.
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Some of the officers remember reading about the Year 2000 problem but thought that it would affect only large businesses and corporations.
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in a keynote address on the JPEG 2000 standard to a delegation of librarians, archivists, representatives of government agencies and professional organizations, and document imaging and compression technology experts.
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