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From east to west, the four time zones of the contiguous United States are: Eastern Time Zone (Zone R), which comprises roughly the states on the Atlantic coast and the eastern two thirds of the Ohio Valley. Central Time Zone (Zone S), which comprises roughly the Gulf Coast, Mississippi Valley, and most of the Great Plains.
Advancing the clock to UTC−09:00 (DST) in Hawaii would make sunrise times close to 7:00 a.m. even in June, [65] because most of the inhabited islands are located close to the west end of the Hawaii–Aleutian Time Zone and Oahu, Kauai, and Niihau are located more than 7 degrees west of the Hawaii–Aleutian Time Zone's meridian and should ...
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.
Nationwide daylight saving time was repealed in 1919, though states and cities still had the option to enact it for themselves, leading to a patchwork of time zones across the country until the ...
Danmarkshavn does not use DST, because it is a weather station with an airstrip which is supplied from Iceland, which does not use DST. This might apply to some other weather stations in the area. Pituffik/Thule Air Base uses UTC−04:00 and United States conventions on DST because it is a US air base, meaning it is part of the Atlantic Time Zone.
The shift is the amount of time added at the DST start time and subtracted at the DST end time. For example, in Canada and the United States, when DST starts, the local time changes from 02:00 to 03:00, and when DST ends, the local time changes from 02:00 to 01:00. As the time change depends on the time zone, it does not occur simultaneously in ...
Prior to this law, time zones and DST observation in America were independent and erratic across states and cities. [ 1 ] [ 2 ] The law requires states to change clocks semiannually between standard time and DST on federally mandated dates, and it permits states to opt out of DST observation altogether and remain on permanent standard time, but ...
The Eastern Time Zone (ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, and the state of Quintana Roo in Mexico. Eastern Standard Time ( EST ) is five hours behind Coordinated Universal Time ( UTC−05:00 ).