Why does the year 2000 cause problems for computers?
Many computer programs were written so that they only use the last two digits of a year when date information is processed. Computers programmed in this fashion will likely “roll over” to 00 in the year 2000. Since 00 is less than 99, computers may think that it is 1900, or may be confused by the 00. This is called the “Y2K bug” and sometimes the “Millennium bug”.
