Well, while only tangentially related because of a missed meeting, I thought this was an interesting thing to post about since I just learned about it.
Basically, less than half of the world currently uses daylight saving time (DST) and the rules are a little more complex than one might originally expect.
Many countries in Europe adjust their clocks at the same time (01:00 GMT) while countries like the USA adjusts clocks locally at 03:00. In addition to the simple act of many countries/time zones adjusting at different times, different countries also switch to DST on different dates, Europe having switched this Sunday while the USA will not switch for another week.
Hope you enjoyed this little tid-bit as much as I did!