When I was 8. I had a yellow t-shirt embroided Y2K with a flying eagle. I went to maternal uncle’s house on that tshirt. A brother, one of the villagers asked me," Y2K, what does it mean?" Which I hadn’t even thought about!!
After returning home, I asked my mom, uncle & brothers that what does it actually mean, pointing my chest’s strange letters. But non-of-them were able to answer.
Later when I became aware about the internet, i remembered that incident & typed Y2K on Google’s homepage.

* The Year 2000 problem (also known as the Y2K was a problem for both digital and non-digital documentation and data storage situations which resulted from the practice of abbreviating a four-digit year to two digits. This made year 2000 indistinguishable from 1900. The former assumption that a twentieth-century date was always understood caused various errors concerning, in particular, the
display of dates and the automated ordering of dated records or real-time events.
Many computer programs stored years with only two decimal digits; for example, 1980 was stored as 80. Some such programs could not distinguish between the year 2000 and the year 1900. Other programs tried to represent
the year 2000 as 19100. This could cause a complete failure and cause date comparisons to produce incorrect results. Some embedded
systems , making use of similar date logic, were expected to fail and cause utilities and other crucial infrastructure to fail.
https://en.wikipedia.org/wiki/Year_2000_problem