Daylight Saving Time
The United States begins Daylight Saving Time at 2:00 a.m. on the second Sunday in March and reverts to standard time on the first Sunday in November. In the U.S., each time zone switches at a different time.The main purpose of Daylight Saving Time (called "Summer Time" in many places in the world) 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.
Clocks Back or Forward?
“Spring forward, fall back” is one of the little sayings used to remember which way to set your watch. You set your clock forward 1 hour in the spring when DST starts (= lose 1 hour), and back 1 hour when DST ends in the fall (= regain 1 hour).
Less than 40% of the countries in the world use DST. Some countries use it to make better use of the natural daylight in the evenings. The difference in light is most noticeable in the areas at a certain distance from Earth's equator.DST is also used to reduce the amount of energy needed for artificial lighting during the evening hours.