Today, Sunday March 25th, we in Norway and all of Europe (not Iceland) get into summer time, or Daylight saving time. At 02.00 CET (Central European Time or GMT+1) we will adjust the clock one hour forward to 03.00.
The Daylight saving time was first mentioned as an idea in 1784 by Benjamin Franklin. But it wasn’t until the World War I in 1916 that Daylight saving time was used in a lot of European countries.
For more info on summer time/Daylight saving time, look at the Wikipedia.org article.