[manwithaplan]

Many Y2K “solutions” just borrowed 20 years, and a few of those systems didnʼt actually invest that time in a fix before the 1st of January 2020:

  One solution involved a technique called “windowing” — in which two-digit years are assigned to either one century or another based on one hard-coded “pivot year” determining where they belong. Even back in 1999, HPCWire was describing it as “highly controversial,” citing one expert who said computers using the technique were “little ticking time bombs waiting to go off.”

https://thenewstack.io/how-the-y2k-bug-returned-on-jan-1-202...