If Y2K happened today, it would be far, far worse
Briefly

The Y2K problem was rooted in decisions made by 1960s-80s programmers who used two-digit year formats; when 2000 arrived, computers often misinterpreted dates as 1900.
The successful mitigation of the Y2K crisis, resulting in minimal disruptions, can be primarily attributed to the diligent efforts of IT professionals who worked tirelessly to implement a fix.
Read at Theregister
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