(Mountain Time is also referred to as the standard time). Simply put, MST of North America keeps time by subtracting seven hours from UTC when standard time is in effect. Īlmost the entire state of Arizona follows Mountain Standard Time or MST throughout the year which has a time zone of Coordinated Universal Time (UTC) offset minus 7 hours, or UTC-7. However, Arizona daylight savings time is practiced only by the Navajo Native American Tribe located in Arizona.
Although DST is not mandatory, all states with the exception of Hawaii and Arizona participate.Īmerican Samoa, US Virgin Islands, Puerto Rico, Guam and the Northern Mariana Islands also do not lose an hour of sleep during DST. When daylight savings time began after World War II, there was plenty of confusion since the states and municipalities made individual decisions on whether to participate until the Uniform Time Act was signed into a bill. Places In The US That Do Not Have Daylight Savings Time
Regardless of whether it was Franklin who started daylight savings time, the concept is plain and simple DST saves energy and money. Apart from the tax breaks, this law caused DST to extend another month, hence the current standard of falling back to standard time in November.ĭaylight saving time is often accredited to Benjamin Franklin because of his 1784 essay titled “An Economical Project,” though many have pointed out that it was merely satire. Twenty years later, the Energy Policy Act of 2005 was signed by President Bush with the goal of ensuring jobs for the future using affordable, reliable and secure energy. Ronald Reagan tweaked this bill stating that DST begins at 2 AM on the first Sunday of April and ends at 2 AM on the last Sunday of October.
In the law that President Johnson signed, DST began on the last Sunday of April and ended on the last Sunday of October for each year. Johnson signed it into a federal law called the Uniform Time Act which declared DST a country-wide policy with start and end times established within the standard time zone. Congress readjusted the western boundary to include parts of Oklahoma and Texas in the standard central time zone.ĭaylight savings time resurfaced during World War II, and was re-established on January 20, 1942. Even still, sections in the 1918 law, particularly those that established standard time zones for the United States, were still in effect. However, this was temporary as it was repealed after the war ended. Īccording to the Library of Congress, the idea of daylight saving time (DST) was established during World War I to help conserve fuel and energy needed by the war industries and to extend working day. There are studies that show that this time change reduces the number of traffic accidents since there is more sunlight in the evening. Countries that participate in the use of DST employ this practice in order to make use of the natural daylight during the evening when the summer months arrive. In the Southern Hemisphere, countries participating in DST start between September and November and end in March or April.ĭaylight saving time is used by 70% of the countries in the world today. Daylight saving time often begins in March or April and ends in between September and November when the clocks are adjusted to standard time. Ĭountries in the Northern Hemisphere use DST, but there are those that do not. When autumn begins, the clock is moved back an hour to its standard time for more early morning daylight. Daylight Savings Time – (DST) is a process where clocks are moved ahead an hour in the spring so that evening daylight lasts longer as the summer season approaches.