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Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.
Every city in the United States used a different time standard so there were more than 300 local sun times to choose from. Time zones were therefore a compromise, relaxing the complex geographic dependence while still allowing local time to be approximate with mean solar time.
The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883 Colorized 1913 time zone map of the United States, showing boundaries very different from today Map of U.S. time zones during between April 2, 2006, and March 11, 2007.
Before then, railroads had operated under 53 different time schedules, leading to confusion, missed trains and at least one fatal accident outside Providence, Rhode Island.
The shift to the current Central European Time zone took place on 16 May 1940. The German occupiers ordered the clock to be moved an hour and forty minutes forward. This time was kept in summer and winter throughout 1941 and 1942. It was only in November 1942 that a different Winter time was introduced, and the time was adjusted one hour backwards.
The same time is used globally, which removes the requirement of calculations between different zones. Possible health benefits as people who live on the eastern side of a time zone are out of sync with the circadian rhythms. [1] [9]
Time zones of a country include that of dependent territories (except Antarctic claims). France, including its overseas territories, has the most time zones with 12 (13 including its claim in Antarctica and all other counties ). Many countries have daylight saving time, one added hour during the local summer, but this list does not
An hour of syndicated programming time (between 7:00 and 8:00 p.m. in the Eastern and Pacific time zones) is lost in the Central and Mountain time zones since network primetime in those areas starts at 7:00 p.m., forcing stations in Mountain or Central time (or in parts of both zones) to choose between airing their 6:00 p.m. newscast and ...