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In 1924, a third time zone based on 120°W (8 hours behind GMT) was established for the northern district of the territory of Baja California (corresponding to the current state of Baja California), and the states of Veracruz and Oaxaca were changed to time zone 90°W (6 hours behind GMT). [4]
This system, as opposed to the 12-hour clock, is the most commonly used time notation in the world today, [A] and is used by the international standard ISO 8601. [ 1 ] A number of countries, particularly English speaking, use the 12-hour clock, or a mixture of the 24- and 12-hour time systems.
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...
The two extreme time zones on Earth (both in the mid-Pacific) differ by 26 hours. Standard Time Zones, as of January 2, 2024 In the following list, only the rightmost indent of a group of locations is meant to indicate the area observing the offset; the places above and to the left are meant solely to indicate the area's parent administrative ...
Whether the 24-hour clock, 12-hour clock, or 6-hour clock is used. Whether the minutes (or fraction of an hour) after the previous hour or until the following hour is used in spoken language. The punctuation used to separate elements in all-numeric dates and times .
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 ).
Even in those countries where the 12-hour clock is predominant, there are frequently contexts (such as science, medicine, the military or transport) in which the 24-hour clock is preferred. In most countries, however, the 24-hour clock is the standard system used, especially in writing. Some nations in Europe and Latin America use a combination ...
Because primetime programs on the East Coast feed are simulcast in two time zones, stations in the Central Time Zone are affected differently from those in the Eastern Time Zone. 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 ...