12 Surpising Facts About

Daylight Saving Time

2. Not all U.S. states and  territories observe DST.

Hawaii and most of Arizona do not observe DST. Neither do most U.S. territories, including Puerto Rico, Guam, American Samoa, the Northern Mariana Islands, and the U.S. Virgin Islands.

3. Some say daylight savings time killed the drive-in movie theater.

A consortium of drive-in movie theater owners bitterly opposed the adoption of DST in 1966. Today, only about 320 remain, and many enthusiasts say that DST is at least partly to blame.

6. Heart attacks are more common on Monday after daylight savings.

A 2014 study by the University of Michigan Frankel Cardiovascular Center shows a 24 percent jump in the number of heart attacks on the Monday after DST compared with other Mondays throughout the year.

8. Most Americans aren't really on board with daylight savings.

Regardless of where they live, about 6 in 10 Americans would like to do away with clock changes. Most prefer the later year-round hours of DST, and about 13 percent want permanent earlier hours.

9. With more daylight in the evenings, shoppers spend more.

Malls, independent retailers, and companies in the sports, leisure, and tourism industries were early proponents of DST and continue to support it today.

10. Farmers are opposed to DST.

Dairy farmers in particular have been vociferously opposed, because cows are sensitive to milking times. Further, many farmers prefer more outdoor work time in the morning rather than the early evening, especially in hot climates.

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