Loyola University Chicago students: Don’t forget to set your clock one hour ahead at 2 a.m. Sunday, March 13 for Daylight Saving Time!

Here are some Daylight Saving Time facts from a National Geographic article:

Most U.S. residents set their clocks one hour forward in spring and one hour back in fall. But people in Hawaii and most of Arizona—along with the U.S. territories of Puerto Rico, American Samoa, and the Virgin Islands—will do nothing. Those locales never deviate from standard time within their particular time zones.

The recently revised federal law, first passed in 1918, now stipulates areas that observe daylight saving time must switch back to standard time at 2 a.m. on the first Sunday in November.

Likewise, the rule requires that regions that observe daylight saving time begin at the same time on the second Sunday in March.

The U.S. Naval Observatory in Washington, D.C., sets what is known as standard time in the country through its maintenance of atomic clocks. But the observatory has nothing to do with regulating daylight saving time.

Oversight of daylight saving time first resided with the Interstate Commerce Commission. In 1966 the U.S. Congress transferred that responsibility to the newly created Department of Transportation.

Congress ordered the transportation agency to “foster and promote widespread and uniform adoption and observance of the same standard of time within and throughout each such standard time zone.”

In 1883 the U.S. railroad industry established official time zones with a set standard time within each zone. Congress eventually came on board, signing the railroad time zone system into law in 1918.

The only federal regulatory agency in existence at that time happened to be the Interstate Commerce Commission, so Congress granted the agency authority over time zones and any future modifications that might be necessary.

Part of the 1918 law also legislated for the observance of daylight saving time nationwide. That section of the act was repealed the following year, and daylight saving time thereafter became a matter left up to local jurisdictions.

Daylight saving time was observed nationally again during World War II but was not uniformly practiced after the war’s end.

Finally, in 1966, Congress passed the Uniform Time Act, which standardized the start and end dates for daylight saving time but allowed individual states to remain on standard time if their legislatures allowed it.

A 1972 amendment extended the option not to observe daylight saving time to areas on the border of two time zones but within the same U.S. state.

Before the move by Congress in 2005 to extend daylight saving time, the most recent modification occurred in 1986, when the start date was moved from the last Sunday in April to the first Sunday in April.

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