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  2. Time synchronization in North America - Wikipedia

    en.wikipedia.org/wiki/Time_synchronization_in...

    Time synchronization in North America can be achieved with many different methods, some of which require only a telephone, while others require expensive, sensitive, and rare electronic equipment. In the United States, the United States Naval Observatory provides the standard of time, called UTC (USNO), for the United States military and the ...

  3. Time in the United States - Wikipedia

    en.wikipedia.org/wiki/Time_in_the_United_States

    Time in the United States. In the United States, time is divided into nine standard time zones covering the states, territories and other US possessions, with most of the country observing daylight saving time (DST) for approximately the spring, summer, and fall months. The time zone boundaries and DST observance are regulated by the Department ...

  4. List of time zones by country - Wikipedia

    en.wikipedia.org/wiki/List_of_time_zones_by_country

    UTC−08:00 (Zone 4 or Northwest Zone) – State of Baja California. UTC−07:00 (Zone 3 or Pacific Zone) – States of Baja California Sur, Chihuahua, Nayarit, Sinaloa and Sonora. UTC−06:00 (Zone 2 or Central Zone) – Most of Mexico. UTC−05:00 (Zone 1 or Southeast Zone) – State of Quintana Roo. Time in Mexico. Chile.

  5. Time zone - Wikipedia

    en.wikipedia.org/wiki/Time_zone

    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.

  6. Central Time Zone - Wikipedia

    en.wikipedia.org/wiki/Central_Time_Zone

    The North American Central Time Zone (CT) is a time zone in parts of Canada, the United States, Mexico, Central America, and some Caribbean islands. [1]In parts of that zone (20 states in the US, three provinces or territories in Canada, and several border municipalities in Mexico), the Central Time Zone is affected by two time designations yearly: Central Standard Time (CST) is observed from ...

  7. Eastern Time Zone - Wikipedia

    en.wikipedia.org/wiki/Eastern_Time_Zone

    Eastern Time Zone. DST is observed in parts of this time zone. 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).

  8. Standard time - Wikipedia

    en.wikipedia.org/wiki/Standard_time

    Standard time is the synchronization of clocks within a geographical region to a single time standard, rather than a local mean time standard. Generally, standard time agrees with the local mean time at some meridian that passes through the region, often near the centre of the region. Historically, standard time was established during the 19th ...

  9. Atlantic Time Zone - Wikipedia

    en.wikipedia.org/wiki/Atlantic_Time_Zone

    The Atlantic Time Zone is a geographical region that keeps standard time—called Atlantic Standard Time (AST)—by subtracting four hours from Coordinated Universal Time (UTC), resulting in UTC−04:00. AST is observed in parts of North America including several Caribbean islands. During part of the year, some portions of the zone observe ...