Each year, in the wee hours of a Sunday morning in March, 60 minutes vanish from the clock. No need to send out a search party — it’s Daylight Saving Time!

Daylight Saving Time (or “Summer Time,” as it’s known in many parts of the world) was created to make better use of the long sunlight hours of the summer. By “springing” clocks forward an hour in March, we move an hour of daylight from the morning to the evening. On the first Sunday in November, we “fall back” and rewind our clocks to return to Standard Time.

But where did Daylight Saving Time come from? And how is it useful?

The idea was first conceived by Benjamin Franklin, but it did not become a standard practice in the United States until 1966. Daylight Saving Time was originally instituted in the United States during World War I and World War II in order to take advantage of longer daylight hours and save energy for the war production.

In the years after World War II, individual states and communities decided whether they wanted to continue observing Daylight Saving Time and when to do so. This meant some cities were an hour behind others even though they were only separated by a few miles on a map.

In order to minimize the confusion, Congress passed the Uniform Time Act in 1966, which standardized the length of Daylight Saving Time for the country.

Daylight Saving Time is most helpful to those who live further from the equator, where daylight hours are much longer in the summer than in the winter. In locations closer to the equator, daylight hours and nighttime hours are nearly the same in length throughout the year.

That’s why many equatorial cities and countries do not participate in Daylight Saving Time. In the United States, there are only a few places that do not observe Daylight Saving Time, including parts of Arizona, Hawaii, Puerto Rico, the U.S. Virgin Islands and American Samoa.

There are currently about 70 countries that participate in Daylight Saving Time, though not necessarily on the same schedule as the United States. Determining who recognizes Daylight Saving Time and when can sound like a very complicated math word problem.

In Europe, Daylight Saving Time runs from the last Sunday in March through the first Sunday in October. In the southern hemisphere, where the summer season begins in December, Daylight Saving Time is recognized from December through March.

Kyrgyzstan and Iceland observe Daylight Saving Time year-round; equatorial countries do not observe Daylight Saving Time at all. Check out this map to see which countries observe DST around the world.

Advocates in support of Daylight Saving Time suggest that in addition to reducing crime and automobile accidents, extended daylight hours also improve energy conservation by allowing people to use less energy to light their businesses and homes. Opposing studies argue the energy saved during Daylight Saving Time is offset by greater energy use during the darker autumn and winter months.

 

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  1. We learned that Benjamin Franklin introduced the idea and eventually the Congress made it official. We were just wondering what year Benjamin Franklin conceived the idea? We did not know that the people in World War I needed more time to prepare for the war.
    We learned a new word, equatorial, which means some place near the equator, and we used background knowledge and context clues to help us.
    We were surprised that some countries do not follow the daylight savings time, including some places in the United States such as HI and AZ. We learned about 70 countries do participate. We also learned we “fall back” the first Sunday of November which is why we were visiting this WONDER today.

    • WOW, Mrs. Caplin’s Class! You guys learned a LOT from exploring this Wonder of the Day®! We’re sure glad you visited today and let us know all the awesome new things you learned! We did a bit more WONDERing about your Benjamin Franklin question, and found several resources that say he came up with the idea for Daylight Savings Time way back in 1784! :-)

    • Thanks for sharing those two great facts about your grandpa, WonderGirl! Please wish him a very happy birthday from your friends in Wonderopolis! :-)

  2. Good article.
    however, we can not change the number of hours of daylight and darkness so any claims associated with daylight and darkness are not credible. It makes no sense to change the clock; if businesses want to change to summer hours then do so but DO NOT change the clock. I grew up on a farm and we got up with the sun and worked until sundown… nothing to do with the clock.

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Have you ever wondered…

  • Why do we have Daylight Saving Time?
  • Who started Daylight Saving Time?
  • Is Daylight Saving Time observed in the same way all over the world?

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Try It Out

While the debate over the value of Daylight Saving Time continues, firefighters around the country are putting it to good use in order to promote a very important message. When you reach for the clock to “spring forward” and “fall back,” remember to reach for your smoke detector, too!

Changing the clocks is a great reminder to change your smoke detector batteries as well. It is also a perfect opportunity to review your family’s fire escape plan with your child.

Another way to involve your little one is by completing a home fire safety inspection together. Visit Sparky the Fire Dog® online for an inspection checklist and learn more about family fire safety together.

 

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