As we approach the end of the millennium, much attention has been
paid to the so-called “Y2K” problem. Nearly everyone now regrets the
short-sightedness of the programmers of yore who wrote programs
designed to fail in the year 2000. Unfortunately, the current fixes
for Y2K lead inevitably to a crisis in the year 10,000 when the
programs are again designed to fail.
AIUI , the first version of Windows 95 ( cf. ibid. 13,14/19) sets the clock back whenever it thinks that the clock has reached 2 a.m. on the day in question, not just on the first occasion.