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  2. Time in the United States - Wikipedia

    en.wikipedia.org/wiki/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 of Transportation, but no ...

  3. History of time in the United States - Wikipedia

    en.wikipedia.org/wiki/History_of_time_in_the...

    The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883 Colorized 1913 time zone map of the United States, showing boundaries very different from today Map of U.S. time zones during between April 2, 2006, and March 11, 2007.

  4. Central Time Zone - Wikipedia

    en.wikipedia.org/wiki/Central_Time_Zone

    The North American Central Time Zone ( CT) [1] is a time zone in parts of Canada, the United States, Mexico, Central America and some Caribbean islands . Central Time Zone is affected by two time designations yearly: Central Standard Time (CST) is observed from the first Sunday in November to the second Sunday in March.

  5. Time in Indiana - Wikipedia

    en.wikipedia.org/wiki/Time_in_Indiana

    Yellow. UTC−05:00. UTC−04:00. Eastern Time. Indiana observes Eastern Time, except for 12 of its 92 counties, which observe Central Time. [2] Six of these counties are in northwestern Indiana, near Chicago (which observes Central Time), and six are in southwestern Indiana, near Evansville, where the metro area includes portions of ...

  6. Eastern Time Zone - Wikipedia

    en.wikipedia.org/wiki/Eastern_Time_Zone

    06:33, 20 May 2024 EST [ refresh] 07:33, 20 May 2024 EDT [ refresh] Observance of DST. 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 . Places that use:

  7. Chicago - Wikipedia

    en.wikipedia.org/wiki/Chicago

    0428803. Website. chicago .gov. Chicago [a] is the most populous city in the U.S. state of Illinois and in the Midwestern United States. With a population of 2,746,388 in the 2020 census, [9] it is the third-most populous city in the United States after New York City and Los Angeles.

  8. tz database - Wikipedia

    en.wikipedia.org/wiki/Tz_database

    This map was made by combining version 2023d of the with data, using open source software. [1] The tz database is a collaborative compilation of information about the world's time zones and rules for observing daylight saving time, primarily intended for use with computer programs and operating systems. [2] Paul Eggert has been its editor and ...

  9. 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.