On Sunday, November 2, 2025, at 2 a.m., Daylight Saving Time (DST) will officially end in most parts of the United States. This time change, which turns the clock back one hour to 1 a.m., gives us a little more sleep but also marks the end of a cycle for a time system with a long history. This annual time adjustment, which has been repeated every year, raises questions about its origins and how it has affected our lives. Today, we will explore the origins, history, and implications of the end of Daylight Saving Time.
Daylight Saving Time, often called Summer Time, means using standard time one hour ahead of the original time during the summer. In other words, it aims to reduce the gap between actual daylight hours and the hours people are active. This is to make better use of the extended daylight hours in summer. It is believed that this can extend the evening hours of sunlight to promote leisure activities and save energy, such as lighting and fuel. However, there has been a long debate over the effectiveness and necessity of this system.
The concept of Daylight Saving Time was first proposed by Benjamin Franklin, an American scientist and politician in the late 18th century. He observed people sleeping late on summer mornings in Paris and suggested that if time were advanced by one hour, it would save on candle usage. However, the person who seriously advocated and popularized this system was William Willett, a British builder in the early 20th century. He thought he could make better use of daylight hours by seeing the bright sunshine when he went out to play golf early in the morning, and based on this, he actively advocated the introduction of Daylight Saving Time.
Daylight Saving Time began to spread worldwide when Germany first adopted it in 1916 during World War I to save coal. Since then, several countries, including the United Kingdom, have adopted this system to save energy and promote wartime economic activity. The United States also first adopted it in 1918 during World War I, and after several repeals and re-introductions, it established a unified application standard with the Uniform Time Act of 1966. In the Republic of Korea, Daylight Saving Time was implemented from 1948 to 1960 and again in 1988 for the Seoul Olympics.
Daylight Saving Time has consistently been presented as having advantages, such as energy saving, promotion of economic activity, and increased leisure time. There are also claims that it has a positive impact on the economy by allowing people to enjoy bright sunshine for longer in the evening, increasing outdoor activities and consumption.
However, there are also dissenting opinions. In addition to the inconvenience of adjusting the time twice a year, problems such as poor sleep quality, worsening health, and impaired cognitive ability are pointed out due to changes in the biological rhythm. There is also a counterargument that overall energy consumption may increase due to increased demand for air conditioning.
With the end of Daylight Saving Time on November 2, 2025, the time difference with Korea will increase by one hour, from 13 hours to 14 hours based on Eastern Time and from 16 hours to 17 hours based on Western Time. Turning the clock back one hour will make the evenings darker faster, and mornings will be a little brighter. This affects our daily patterns, coinciding with the natural seasonal change of shorter days and longer nights during autumn and winter. Most smartphones and computers automatically adjust the time, but analog clocks and some home appliances require manual time changes.
In the United States, some states, such as Arizona and Hawaii, do not implement DST, and about 70 countries around the world implement this system. However, the debate over the abolition of DST continues every year. The U.S. Senate tried to pass the 'Sunshine Protection Act' in 2022 to permanently apply DST, but it was automatically abolished because it was not processed in the House of Representatives, and the attempt to abolish it at the congressional level was also unsuccessful. The European Union (EU) also implements Summer Time, which starts on the last Sunday of March and ends on the last Sunday of October, but calls for its abolition are increasing. It is pointed out that the time change causes economic confusion and health problems, so the fate of DST will continue to be discussed in the future.
Daylight Saving Time is a system that has affected the lives of many people around the world for decades. On November 2, 2025, as the clock turns back again, we prepare for the long winter nights. Even amid the minor confusion caused by this time change, we will be able to reconsider the meaning of time and the impact of the system on our society. The future of DST is unknown, but the questions this historical time system poses will continue.
In most parts of the United States, Daylight Saving Time (DST) ends on Sunday, November 2, 2025, at 2 a.m. Clocks will be turned back one hour to 1 a.m.
Daylight Saving Time was created to efficiently utilize the longer daylight hours in summer to save energy (lighting, fuel, etc.) and promote outdoor activities and economic activity by extending the evening hours of sunlight.
Time adjustments due to DST can affect sleep patterns and disrupt the biological rhythm. This is pointed out as causing health problems such as poor sleep quality, increased fatigue, and impaired cognitive abilities.
No, the Republic of Korea currently does not implement Daylight Saving Time (Summer Time). It was implemented in the past, from 1948 to 1960 and again from 1987 to 1988.
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