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Aleutian Islands (west of 169°30' W): UTC−10:00 HST Hawaii–Aleutian Standard Time American Samoa: UTC−11:00 ST: No: Samoa Standard Time Arizona: UTC−07:00 MT: Part Mountain Standard Time. Except for the Navajo Nation, Arizona does not observe DST. Arkansas: UTC−06:00 CT: Yes: Central California: UTC−08:00 PT: Yes: Pacific Standard ...
Rand McNally Standard Map of the United States, 1921, showing boundaries different from today See also: Standard time in the United States Before the adoption of four standard time zones for the continental United States, many towns and cities set their clocks to noon when the sun passed their local meridian , pre-corrected for the equation of ...
Alternatively, noon may be written as 午前12時 (12 a.m.) and midnight at the end of the day as 午後12時 (12 p.m.), as opposed to 午前0時 (0 a.m.) for the start of the day, making the Japanese convention the opposite of the English usage of 12 a.m. and 12 p.m. [29]
The offsets range from UTC−12:00 to UTC+14:00, and are usually a whole number of hours, but a few zones are offset by an additional 30 or 45 minutes, such as in India and Nepal. Some areas in a time zone may use a different offset for part of the year, typically one hour ahead during spring and summer , a practice known as daylight saving ...
In these cases, exact and unambiguous communication of time is critical. If someone mistakes 5:00 AM for 5:00 PM in a hospital for example, when medication or other medical treatment is needed at a certain time, the outcome could be dire. Thus 24-hour time (5:00 PM written as 17:00) is used.
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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 ...