The only thing that could have gone wrong was a few interest calculations for banks that hadn't bothered to update their software for thirty odd years.

Shoot, I've got some old computers with the old software, all pre Y2K panic, all declared as dangerous at the time, I actually had them running over that week, not one of them had a hiccup. Neither did any of the old computer controlled household goods I had.

Simply put, no computer hardware actually used dates in their operations, they used integers that they converted to dates for display purposes. This was also how the majority of software worked, and still works.

Saying the Y2K averted a disaster is like saying changing from leaded petrol to unleaded petrol stop the world from blowing up. Ie. total BS of no relevance to real life.

Y2K was a major money making con job of an ad campaign, and it worked.