William Willett was a middle-class contractor living in the Chistlehurst district of southeast London. Without him, daylight saving time would not exist in England or in a quarter of the world's countries. Although the sun had risen, he had seen that the curtains were still closed in most houses and had asked the question: What would happen if the clocks were put forward at the beginning of summer? Willett was not the first to think this. In ancient civilizations, days were lengthened and shortened depending on the season. For example, Roman time was 44 minutes in winter and 75 minutes in summer. Waste of daylight In 1895, New Zealand entomogist (insectologist) George Hunter suggested a two-hour change, but his proposal was not taken seriously. Six years later, in 1901, King Edward VII, In 1907, Willett published a pamphlet on 'The Waste of Daylight' in which he set the clocks forward by 20 minutes four times in April, and again in September, in order to avoid this. He suggested a return to the old clock. Thus, lighting costs could also be reduced. Some politicians of the period, such as David Lloyd George and the young Winston Churchill, also supported this idea. While the Daylight Savings Act was being debated in parliament, Arthur Conan Doyle, the author of Sherlock Holmes, also declared that he supported the law, but that it would be much simpler to set the clocks forward just one hour at a time and would not confuse anyone. This proposal was defeated in the next few attempts. But Willett continued to campaign on the issue in England, Europe, and America until he died of the flu in 1915. A year after his death, Willett's proposal was accepted, slightly modified. The reason was the war. The effect of the war It had been two years since the First World War had begun, that England had begun to suffer from a shortage of coal. At that time, coal was the main source of energy in both industry and homes. David Stevenson, professor of history at the London School of Economics, said, “Not only did the demand for fuel in the navy, railroads, and residences increase, but it was also necessary to meet the coal demand of the Allies whose coal deposits were under German occupation.” Willett's idea might be the solution. After Germany passed a law on daylight saving time on April 30, 1916, a similar law came into force in England on May 17. Stephenson says that such cheating behavior was common at the time. “Britain has long drawn inspiration from Germany for many ideas. Most British politicians and intellectuals took this country as an example of efficiency.” This practice was followed by this practice. Applications aimed at saving daylight are constantly being discussed and changed in many parts of the world. In general, it is stated that daylight saving time contributes to sales, sports and tourism, but negatively affects agriculture and postal service. He says that it has a negative effect similar to the effect. As North Korea celebrated its 70th anniversary last year, it turned the clocks back 30 minutes to the time zone used before the invasion of Japan. About a quarter of the world's 7.4 billion population uses daylight saving time.