Daylight Savings Time refers to the day in which people turn their clocks forward one hour in order to preserve more daylight in the evenings. This occurred today, March 9th, at 2 am. It is also called “Spring Forward” to help people remember that clocks move forward an hour in spring, and move back an hour in fall, which is called “Fall Back.” States in the US are not required to observe Daylight Savings Time, which is why the state of Arizona does not.
Daylight Savings Time was originally introduced by George Vernon Hudson in 1895 and was later implemented in some European countries in 1916. It is now used in several countries throughout the world, but it is more common in the Western world.