Daylight savings is observed twice a year, when we adjust our clocks so that the sun will rise earlier or later.
Benjamin Franklin first suggested that shops could close earlier to save on the cost of lighting, an early proposal of what would become daylight savings time. But it wasn’t until World War I that it was formally implemented; countries at war started setting their clocks back to save on coal. We still fall back or spring forward depending on the season to boost energy savings by reducing the need of electricity for lighting.
In 1987, federal legislation established that daylight savings time in the United States would be observed on the first Sunday in April to the last Sunday in October. This was amended in 2007 to be the second Sunday in March and the first Sunday in November, extending the duration of daylight savings time.
The states and territories of the United States that DO NOT observe daylight savings are Hawaii, Puerto Rico, the Virgin Islands, American Samoa, Guam, and the Northern Marianas Islands.
References:
Daylight saving time. (2015). Columbia Electronic Encyclopedia, 6th Edition, 1.
Guarino, M. (2014, March 8). Daylight Saving Time is upon us: Which way to move the clocks?. Christian Science Monitor. p. N.PAG.
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