Most western nations advance the clock ahead one-hour during the summer months.
We call this period Daylight Saving Time. Benjamin Franklin originally suggested the idea. He wanted to take advantage of the additional daylight time in the summer when many people were sleeping. The United States did not adopt Daylight Saving Time until World War I, and today Arizona, Hawaii and most of Indiana do not observe Daylight Saving Time. Daylight Saving Time lasts from the first Sunday in April to the last Sunday in October in the most of the United States, Mexico and Canada.