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  2. Effects of time zones on North American broadcasting

    en.wikipedia.org/wiki/Effects_of_time_zones_on...

    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 ...

  3. Time in Mexico - Wikipedia

    en.wikipedia.org/wiki/Time_in_Mexico

    Standard time was first adopted in Mexico in 1922, under a decree by President Álvaro Obregón establishing two time zones. One time zone based on 105°W (7 hours behind GMT) covered most of the country, from Baja California to Veracruz and Oaxaca. A second time zone based on 90°W (6 hours behind GMT) covered the southeastern part of the ...

  4. List of tz database time zones - Wikipedia

    en.wikipedia.org/wiki/List_of_tz_database_time_zones

    The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]

  5. Time in the United States - Wikipedia

    en.wikipedia.org/wiki/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 time on the date of observation, to form local mean solar time. Noon occurred at different times but time differences between distant ...

  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 a few 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. 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.

  8. List of time zones by country - Wikipedia

    en.wikipedia.org/wiki/List_of_time_zones_by_country

    Time in Brazil: Mexico: 4: 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 ...

  9. Daylight saving time in Mexico - Wikipedia

    en.wikipedia.org/wiki/Daylight_saving_time_in_Mexico

    The Government of Mexico adopted daylight saving time nationwide in 1996 to decrease energy consumption and to facilitate commerce and tourism with the neighboring United States. [4] [5] In December 2009, Congress permitted municipalities less than 20 kilometers from the U.S. border to synchronize their time with their U.S. counterparts. This ...