The term "British Summer Time" refers to the period of the year when the clocks are set one hour ahead of Greenwich Mean Time. This time period is also known as "Daylight Saving Time" or "DST". Other terms that are commonly used to refer to this period include "Summer Hours", "Summer Time", "Daylight Time", and "Daylight Hours". These terms are used interchangeably to indicate the same period of the year when people have more daylight hours to enjoy and take advantage of. The term "British Summer Time" is specific to the United Kingdom, but the concept of adjusting the clocks to make use of daylight hours is used in many other countries around the world.