Daylight Saving Time

Celebrated on 03/08/2026

Quick Fact

The idea of Daylight Saving Time was first proposed by Benjamin Franklin in 1784 as a way to save candles, but it wasn't implemented until World War I. Today, over 70 countries observe it, affecting more than 1.6 billion people worldwide.

Origins and Establishment of Daylight Saving Time

Daylight Saving Time (DST) was first proposed by Benjamin Franklin in 1784 in a satirical essay, but it wasn't seriously considered until the early 20th century. In 1907, British builder William Willett campaigned for a two-step time shift to save daylight, publishing "The Waste of Daylight." However, it was Germany and Austria-Hungary that first implemented DST on April 30, 1916, during World War I, to conserve coal. The United States followed in 1918 with the Standard Time Act, which established DST but was repealed after the war due to unpopularity.

Evolution and Modern Commemoration

DST was revived during World War II and became permanent in the U.S. from 1942 to 1945. After the war, states and localities could choose whether to observe it, leading to confusion. The Uniform Time Act of 1966 standardized DST observance in the U.S., starting the last Sunday in April and ending the last Sunday in October. The Energy Policy Act of 2005 extended DST by four weeks, starting in 2007, to save energy. Today, DST is observed in most of North America, Europe, and parts of South America and Australia, though many regions debate its effectiveness and health impacts.

Facts & General Observations

• Approximately 1.6 billion people in about 70 countries observe DST each year.
• Studies show DST reduces energy consumption by only about 0.5% to 1% in some regions, while others see no savings or even increases.
• The Monday after the spring shift to DST is associated with a 24% increase in heart attacks and a 6% rise in workplace injuries due to sleep disruption.

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