English

electronic sign reading January 1900 instead of January 2000

Proper noun

millennium bug

1. (computing) A design flaw in computer systems that represented years as two digits (e.g. 84 for 1984), which could cause date calculations to fail if they involved years later than 1999.

Synonyms

• Y2K bug
• year 2000 problem

Translations

See also

• Appendix:American Dialect Society words of the year