About half of small and midsize companies using computers in Tokyo have not yet adapted their systems to cope with the “Year 2000 problem,” or Millennium Bug, which is expected to wreak havoc on companies with computers unable to process 21st century dates, a metropolitan survey says.

The survey, released Friday by the Economic and Labor Bureau of the Tokyo Metropolitan Government, comes less than two years before the next century. Many old computer systems are not designed to deal with dates beyond 1999 because of a coding oversight that reads only the last two digits of a year. The result could be disastrous — an invoice with a due date in 2000 could be mistaken for 1900, and be mistaken as 100 years overdue.

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