Daylight Saving Time was first officially used during World War I. On April 30, 1916, Germany and Austria-Hungary were the first countries to adopt daylight savings to save energy for the war effort. By shifting the clocks forward, they could reduce the need for artificial lighting and conserve fuel. Soon after, many other countries involved in the war, including the United States and the United Kingdom, also took on daylight savings.After World War I ended, many countries stopped using daylight savings. However, the idea resurfaced during World War II. Once again, countries needed to save energy, and daylight savings was seen as a helpful solution. In the United States, daylight savings was reintroduced in 1942 and lasted until the end of the war in 1945. After World War II, there was no standard practice for daylight savings in the United States. Different states and cities had their own rules, which caused confusion. To solve this problem, the U.S. Congress passed the Uniform Time Act of 1966. This law established a consistent daylight savings schedule across the country, starting on the last Sunday in April and ending on the last Sunday in