Well acutally there are a few areas of the country where day light savings time is not observed.
If you want an explanation for the time change I belive and I may be wrong. As this is just a story I heard.
In the old times when farming was most prevlent form of occupation and the kids on the farm went off to school it would get dark so early 6pm-7pm and inorder to make the most of the day light and the longer light it was decided to move forward the clocks 1 hour at the start of spring so that when the kids got home form school there would be more day light hours for them to work on the faimly farms. The logic with moving the time back 1 hour at the start of winter is so as it not getting dark at late afternoon.
Again this is jsut a story I heard and could be way off basel.