Year 2000

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Year 2000

(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).

This article is provided by FOLDOC - Free Online Dictionary of Computing (
References in periodicals archive ?
In midtown during the five-year period from 1995 to 2000, real estate taxes increased only 49 cents psf, or 5%.
Rainfall was concentrated in the mountainous regions east of the Red Sea coast, and was heaviest in the areas east of Djeddah and Jizan, with rainfall totals as high as 120 mm and 60-80 mm, respectively, during April 2005, compared with the same period in 2000 (10-50 mm) (online Appendix Figure panels C and D) and in southwestern Yemen, with totals as high as 120 mm during May.
AYRES KAHLER 6800 Normal Blvd, Lincoln, NE 68506; 402/441-4700, FAX: 402/441-4740 7735 South 134th St, Suite 101, Omaha, NE 68138 Web site: Year established: 1946 Number of employees: 35 Connie Bayless ( Pres: Mick Sibbel ( Ag Creative Dir: Bob Mormann ( Ag Media Dir: Karen Brokaw ( PR Dir: Cullen West ( Ad ag accts: Firestone Ag Tires (projects), 1996; Stauffer Seeds, 2001 (both Lynn Franzluebbers); Baldwin Filters (projects), 2003; Hoegemeyer Hybrids, 2000; TierOne Bank, 1945; Triton Genetics, 2002; Valmont Irrigation, 1961 (all Mick Sibbel) Ad farmer-funded accts: Nebraska Farmers Choice, 2000 (Karen Brokaw)
Department of Labor shows that wages for nearly half of those earning below the citywide median haven't risen as fast as inflation since 2000.
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2000 vote: Harry Browne, in keeping with my usual (though not automatic) practice of voting for the Libertarian presidential nominee.
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It's available for use with Office 10 for Mac, office XP, Office 2000, StarOffice and Appleworks 6.