Daylight Saving Time Started March 11, Affects Calendars (and More)
Effective this year, Daylight Saving Time (DST) is extended by four weeks because of the U.S. Energy Policy Act of 2005. In 2007, DST begins at 2:00 a.m. on March 11 (three weeks earlier than usual), and ends at 2:00 a.m. on November 4 (one week later than last year). In addition, many other countries around the world are making changes to their time zones as well.
Why does this matter, and what does this mean for computers and applications?
Many applications, such as calendars, use the date and time to run properly. Without some intervention, meetings on your calendar this year that fall during the extra weeks of DST will be off by one hour, since those weeks used to be standard time.
Read more: http://www.it.iastate.edu/dst/