Presaged by a 1784 letter of Ben Franklin, what concept saw its first widespread use in 1916 as a wartime measure aimed at conserving coal?
Time zone adopt daylight saving time (also known as "Summer Time") during part of the year. This typically involves advancing clocks by an hour near the start of spring and adjusting back in autumn ("spring forward", "fall back"). Modern DST was first proposed in 1907 and was in widespread use in 1916 as a wartime measure aimed at conserving coal. Despite controversy, many countries have used it off and on since then; details vary by location and change occasionally. Most countries around the equator do not observe daylight saving time, since the seasonal difference in sunlight is minimal. Computer operating systems include
Wartime Measure Act of 1918 to Quit the United States," also discussed the issue of travel control during this time. The President amended a previous Executive Order, so that "hostile or enemy aliens" that wished to leave the United States no longer needed permission for departure, unless stated by the Secretary of State. A passport from their country of origin was sufficient, so long as it was dated within one year prior to the desired date of departure. Wartime Measure Act of 1918 Wartime Measure Act of 1918 was United States federal legislation deeming wartime travel as an unlawful act when touring without an United