millennium bug definition

  • noun:
    • See Y2K bug.
    • A design flaw in computers which represented the year with 2 digits (ex. 1984 = 84), which may cause time calculations to fail after 1999.
    • a mistake into the coding of particular computer programs which store the season component of the day as two digits, assuming that the initial two digits are 19, versus as a total wide range of four digits; when such programs are used after January 1, 2000, the date could be misinterpreted, causing serious mistakes or complete failure of this program; -- labeled as additionally year 2000 bug, year 2000 issue and Y2K bug.

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