There has been extensive debate about whether to stop this change, or "lock the clock," but so far, no national change has been made.

Here's what to know about the Daylight Saving Time debate.

What Is Daylight Saving Time?

Daylight Saving Time begins on the second Sunday in March every year, and clocks are set forward by one hour, an action often referred to as "spring forward."

The hour is gained on the first Sunday in November when Daylight Saving Time ends, and the clocks are set back one hour to "fall back."

This is observed nationwide, with some exceptions. They are: Hawaii, American Samoa, Guam, Northern Mariana Islands, Puerto Rico, the Virgin Islands, and most of Arizona. However, if Daylight Saving Time is observed, it is required to begin and end on the federally mandated dates. 

The practice of changing the clock twice a year has been observed since 1918, and was enacted through the Standard Time Act, which also created standard time zones.

Later, in 1966, the Uniform Time Act amended the practice to allow a state to exempt itself, or a part of itself that lies in a different time zone, from the observance of Daylight Saving Time, meaning they would have to lock their clocks on standard time. 

The rules for Daylight Saving Time changed in 2007 for the first time in over 20 years, and the amount of time for the change was lengthened in the interest of a reduction of energy consumption.

Daylight Saving Time was lengthened by about one month, now taking up 238 days, or around 65 percent, of the year.