At the beginning of the DST period in the spring, clocks are moved forward, usually by one hour. When DST ends in fall (autumn), clocks are turned back again. DST does not add daylight, but it gives more hours with light in the evening. In that sense, DST “saves” light, especially during early spring. Standard time refers to time without DST.
Another commonly used term for DST is “Summer Time.” In the United Kingdom, the DST time zone is called British Summer Time (BST). During standard time, Greenwich Mean Time (GMT) is used. It is sometimes referred to as “winter time.”
“Summer time” is used to name various bills about DST in the United Kingdom, including the Summer Time Act of 1916, the Summer Time Act of 1925, and the Summer Time Act of 1972.
The term “Sommerzeit” (summer time) is also used in Germany to describe DST. The term first emerged as early as 1916 when the German Federal Council decreed that “Sommerzeit” would be used in Germany as a wartime measure, starting on the last Sunday of April.