I think that the referred confusion is the difference in applying the DST between Europe and US: Start and end dates vary with location and year. Since 1996, E

I think that the referred confusion is the difference in applying the DST between Europe and US: Start and end dates vary with location and year. Since 1996, European Summer Time has been observed from the last Sunday in March to the last Sunday in October; previously the rules were not uniform across the European Union. Starting in 2007, most of the United States and Canada observe DST from the second Sunday in March to the first Sunday in November, almost two-thirds of the year. The problem is that if you're European (like me) and have recurring weekly meetings with US based coworkers the meetings will be shifted by an hour until the other party shifts the clock.