Clocks and integrated time play a big and hidden role in our lives. This weekend in the US we are setting daylight savings time up in advance 3 weeks ahead of our normal schedule. Expect a few things to go wrong. Here is a New York Times piece about it.
I was a specialist in this area for the big Y2K event which turned out to be a non-event. This weekend shouldn't pose any problems. There is a very small chance for major problems, but nothing the average person can either control or get too excited about.
For an interesting look at banking risk and how a German bank failed in 1974 due to poor understanding of a US holiday have a look at an old paper I wrote for the US senate. Banking Risk and Y2k Download bankingtestiimony.pdf