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What Is Daylight Saving Time?

Daylight Saving Time (“DST”) is the practice of moving the clocks forward one hour from Standard Time during the summer months and changing the time back again in the fall. 

The general idea is that this allows us all to use natural daylight better: moving the clocks forward one hour in the spring grants us more daylight during summer evenings, while moving clocks back one hour in the fall grants us more daylight during winter mornings. 

However, DST has many detractors—and rightfully so! (Read more about this below.)

Daylight Saving Time 2024: When Does the Time Change?

Daylight Saving Time begins on the second Sunday in March and ends on the first Sunday in November. 

To remember which way to set their clocks, folks often use the expression, “spring forward, fall back.”

• Daylight Saving Time begins on Sunday, March 9, 2025, at 2:00 A.M. On Saturday night, clocks are set forward 1 hour (i.e., losing one hour) to “spring forward.” Sunrise and sunset will be about 1 hour later on March 9, 2025, than the day before. There will be more light in the evening.
• Daylight Saving Time ends on Sunday, November 2, 2025, at 2:00 A.M. On Saturday night, clocks are set back 1 hour (i.e., gaining one hour) to “fall back.” Sunrise and sunset will be about 1 hour earlier on November 2, 2025, than the day before. There will be more light in the morning.

Note: Since the time changes at 2:00 A.M., we generally change our clocks before bed on Saturday.

Daylight Saving Time Dates

(Note that DST dates are for locations in the United States and Canada only; other countries may follow different dates!)

Note: In the U.S., exceptions to DST are Arizona (except for the Navajo Nation), Hawaii, Puerto Rico, the U.S. Virgin Islands, Northern Mariana Islands, Guam, and American Samoa.

Is it Daylight “Saving” or “Savings” Time?

The correct term is “Daylight Saving Time“ and not “Daylight Savings Time” (with an extra “s”), though many of us are guilty of saying it the wrong way. The technical explanation is that the word “saving” is singular because it acts as part of an adjective rather than a verb.

Using Daylight Time (DT) Versus Standard Time (ST)

After Daylight Saving Time begins and through the summer months, the period is called “Daylight Time,” abbreviated “DT.” When Daylight Saving Time ends, we return to “Standard Time” or “ST.” This abbreviation includes the time zone. For example, Eastern Daylight Time is EDT, and Eastern Standard Time is EST.  See more examples below:

Time Zone Abbreviations

After Daylight Saving Time Begins (March through November)

• Eastern Daylight Time or EDT
• Central Daylight Time or CDT
• Mountain Daylight Time or MDT
• Pacific Daylight Time or PDT

After Daylight Saving Ends (November through March)

• Eastern Standard Time or EST
• Central Standard Time or CST
• Mountain Standard Time or MST
• Pacific Standard Time or PST

The History of Daylight Saving Time

Why Did Daylight Saving Time Start? 

Should we blame Ben?

” written in 1784, is the earliest known proposal to “save” daylight. It was whimsical in tone, advocating laws to compel citizens to rise at the crack of dawn to save the expense of candlelight:

“Every morning, as soon as the Sun rises, let all the bells in every church be set ringing: and if that is not sufficient, let cannon be fired in every street to wake the sluggards effectually… . Oblige a man to rise at four in the morning, and it is probable that he will go willingly to bed at eight in the evening.”

DST’s True Founder? 

The first true proponent of Daylight Saving Time was an Englishman named William Willet. A London builder, he conceived the idea while riding his horse early one morning in 1907. He noticed that the shutters of houses were tightly closed even though the Sun had risen. In “,” the manifesto of his personal light-saving campaign, Willet wrote, “Everyone appreciates the long, light evenings. Everyone laments their shrinkage as the days grow shorter, and nearly everyone has given utterance to a regret that the nearly clear, bright light of an early morning during Spring and Summer months is so seldom seen or used… . That so many as 210 hours of daylight are, to all intents and purposes, wasted every year is a defect in our civilization. Let England recognize and remedy it.”

Willet spent a small fortune lobbying businessmen, members of Parliament, and the U.S. Congress to put clocks ahead 20 minutes on each of the four Sundays in April and reverse the process on consecutive Sundays in September. But his proposal was met mostly with ridicule. One community opposed it on moral grounds, calling the practice the sin of “lying” about true time.

World War I Led to the Adoption of DST

Attitudes changed after World War I began. The government and citizenry recognized the need to conserve coal used for heating homes. The Germans were the first to officially adopt the light-extending system in 1915 as a fuel-saving measure during World War I. This led to the introduction in : From May 21 to October 1, clocks in Britain were put an hour ahead.

The United States followed in 1918 when Congress passed the Standard Time Act, establishing the time zones. However, this was amidst significant public opposition. A U.S. government Congressional Committee was formed to investigate the benefits of Daylight Saving Time. Many Americans viewed the practice as an absurd attempt to make late sleepers get up early. Others thought following “clock time” was unnatural instead of “Sun time.” A columnist in the Saturday Evening Post offered this alternative: “Why not ‘save summer’ by having June begin at the end of February?”

The matter took on new meaning in April 1917, when President Woodrow Wilson declared war. Suddenly, energy conservation was paramount, and several efforts were launched to enlist public support for changing the clocks.

A group called the National Daylight Saving Convention distributed postcards showing Uncle Sam holding a garden hoe and rifle, turning back the hands of a giant pocket watch. Voters were asked to sign and mail to their congressman postcards that declared, “If I have more daylight, I can work longer for my country. We need every hour of light.” Manhattan’s borough president testified to Congress that the extra hour of light would be a boon to home gardening and, therefore, increase the Allies’ food supply. Posters chided, “Uncle Sam, your enemies have been up and are at work in the extra hour of daylight—when will YOU �ɲ����&�Բ�����;�ܱ�?”

With public opinion in its favor, Congress officially declared that all clocks would be moved ahead (Canada adopted a similar policy later the same year.) Americans were encouraged to turn off their lights and go to bed earlier than they usually did—at around 8:00 P.M.

Farmers Did NOT Favor DST

Many Americans wrongly point to farmers as the driving force behind Daylight Saving Time. In fact, farmers were its strongest opponents and, as a group, stubbornly resisted the change from the beginning.

When the war ended, the farmers and working-class people who had held their tongues began speaking out. They demanded an end to Daylight Saving Time, claiming it benefited only office workers and the leisure class. The controversy spotlighted the growing gap between rural and urban dwellers. As a writer for the Literary Digest put it, “The farmer objects to doing his early chores in the dark merely so that his city brother, who is sound asleep at the time, may enjoy a daylight motor ride at eight in the evening.”

The Daylight Saving Time experiment lasted only until 1920, when the law was repealed due to opposition from dairy farmers (cows ignore clocks). No fewer than 28 bills to repeal Daylight Saving Time had been introduced to Congress, and the law was removed from the books. Americans had tolerated Daylight Saving Time for about seven months.

DST Returns 

The subject did not come up again until after the attack on Pearl Harbor on December 7, 1941, and the United States was once again at war.

During World War II, Daylight Saving Time was imposed again (year-round) to save fuel. Clocks were set one hour ahead to save energy.

After the war (which concluded with Japan’s final surrender on September 2, 1945), Daylight Saving Time started being used on and off in different states, beginning and ending on days of their choosing.

Local Differences and Inconsistency

Inconsistent adherence to time zones among the states created considerable confusion with interstate bus and train service. To remedy the situation, Congress passed the Uniform Time Act in 1966, establishing consistent use of Daylight Saving Time within the United States: Clocks were to be set ahead one hour on the last Sunday in April and one hour back on the last Sunday in October.

That was the rule, but some state legislatures made exceptions via a loophole built into the law. Residents of Hawaii and most of Arizona did not change their clocks. Residents of Indiana, which straddles the Eastern and Central time zones, were sharply divided on Daylight Saving Time: Some counties employed it, some did not.

In 1986, the U.S. Congress approved a bill to increase the period of Daylight Saving Time, moving the start to the first Sunday in April. The goal was to conserve oil for generating electricity—an estimated 300,000 barrels annually. (In 2005, the entire state of Indiana became the 48th state to observe Daylight Saving Time.)

Daylight Saving Time Today

The current daylight saving period was established with the which went into effect in 2007.

Today, most Americans spring forward (turn clocks ahead and lose an hour) on the second Sunday in March (at 2:00 A.M.) and fall back (turn clocks back and gain an hour) on the first Sunday in November (at 2:00 A.M.). See how your sunrise and sunset times will change with our Sunrise/Set Calculator.

However, farmers’ organizations continue to lobby Congress against the practice, preferring early daylight to tend to their fields and a Standard Time sunset for ending their work at a reasonable hour. Some farmers point out that Daylight Saving Time is deceptively misnamed. “It is a gimmick that changes the relationship between ‘Sun’ time and ‘clock’ time but saves neither time nor daylight,” says Katherine Dutro, spokesperson for the

Most of Canada is on Daylight Saving Time; only portions of Saskatchewan and small pockets of British Columbia remain on Standard Time year-round. However, the practice has its detractors. In the words of a current-day Canadian poultry producer, “The chickens do not adapt to the changed clock until several weeks have gone by, so the first week of April and the last week of October are very frustrating for us.” Similarly, one Canadian researcher likened increased traffic accidents to the onset of Daylight Saving Time. Other experts insist that the extra hour of daylight reduces crime. 

As of January 2023, 19 states have passed bills to end the practice of switching clocks. However, the legislation can only go into effect if federal law changes. The Uniform Time Act would need to be amended to allow such a change. In early 2022, a bill to enact permanent Daylight Saving Time unanimously passed in the Senate, but the House did not take it up, and it will now have to be reintroduced to have any chance of moving forward.  See the latest on which states have passed bills to stop DST changes.

Share your thoughts about DST below—and see readers’ comments from the past. As you can see, our �������� readers are quite passionate about this topic!