The main purpose of daylight saving time (DST) is to make better use of daylight. We change our clocks during the summer months to move an hour of daylight from the morning to the evening.

DST, also known as summer time, always starts on the last Sunday in March and ends on the last Sunday in October.

For 2009 this will be as follows:

• DST begins on Sunday, 29 March at 2 am. The clocks are then set forward one hour.
• DST ends on Sunday, 25 October at 3 am. The clocks are then set back one hour.

For 2010 this will be as follows:

• DST begins on Sunday, 28 March at 2 am. The clocks are then set forward one hour.
• DST ends on Sunday, 31 October at 3 am. The clocks are then set back one hour.

The time zone for Norway is Greenwich Mean Time (GMT) +1 hour.