Links Year 2000, Part 1 . There's no point at all in replacing an office or home PC just to cure the rollover problem. But forced reorganisation of software is expensive. All Will Be Well.
Similar considerations apply to larger systems.
Operating systems, among others, must be checked, for 2000 and other years. The year 1988 was a leap year which was accidentally omitted by a software vendor of mainframe security systems. Starting at midnight on the 28th of February 1988, customers began to be locked out from their computers because February 29th was not considered to be a valid date. For many IBM systems, this second count is too large by 86400, because their programmers believe that February of 1900 had 29 days. As soon as I reset the date correctly to 5 Mar, it worked perfectly thereafter.