Today, Daylight Saving Time (DST) is used to save energy and make better use of daylight. The idea has been suggested in ancient times and later by famous scientists.
DST is a change in the standard time with the purpose of making better use of daylight and conserving energy.
Clocks are set ahead one hour when DST starts. This means that the sunrise and sunset will be one hour later, on the clock, than the day before.
In the U.S., Daylight Saving Time – or “fast time”, as it was called then – was first introduced in 1918 when President Woodrow Wilson signed it into law to support the war effort during World War I. The initiative was sparked by Robert Garland, a Pittsburgh industrialist who had encountered the idea in the United Kingdom. A passionate campainer for the use of DST in the United States, he is often called the “father of Daylight Saving”.
Seasonal time change was repealed just seven months later. However, some cities – including Pittsburgh, Boston, and New York – continued to use it until President Franklin D. Roosevelt instituted year-round DST in the United States in 1942.