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From east to west, the four time zones of the contiguous United States are: Eastern Time Zone (Zone R), which comprises roughly the states on the Atlantic coast and the eastern two thirds of the Ohio Valley. Central Time Zone (Zone S), which comprises roughly the Gulf Coast, Mississippi Valley, and most of the Great Plains.
Most of state: UTC−06:00 CST Central Standard Time UTC−07:00 MT El Paso and Hudspeth counties: UTC−07:00 MST Mountain Standard Time U.S. Minor Outlying Islands: UTC+12:00 UTC−12:00 UTC−11:00 ST UTC−10:00 HT UTC−05:00 ET: No: Wake Island: UTC+12:00 (Wake Island Time Zone) Baker Island and Howland Island: UTC−12:00
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: Eastern Standard Time (EST), when observing standard time (autumn/winter), are five hours behind Coordinated Universal Time (UTC−05:00).
Ten states are contained entirely in the Central Time Zone: Alabama; Arkansas; Illinois; Iowa; Louisiana; Minnesota; Mississippi; Missouri; Oklahoma; Wisconsin; Five states are split between the Central Time Zone and the Mountain Time Zone: Kansas: all except for Sherman, Wallace, Greeley, and Hamilton counties
Each time zone is defined by a standard offset from Coordinated Universal Time (UTC). 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.
History of time in the United States. 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.
The tz database lists 11 time zones for Indiana, where each zone is defined as a geographic area that observed the same offsets from UTC since January 1, 1970 (the UNIX epoch ). The diagrams in this article are colored to show these 11 zones and a key is provided below.
List of UTC offsets – current UTC offsets. List of time zone abbreviations – abbreviations. List of tz database time zones – zones used by many computer systems as defined by IANA. List of military time zones. Country-specific: List of time zones by U.S. state.
Map of Michigan time zones. Counties in dark red follow Central Time while counties in yellow follow Eastern Time. Michigan observes Eastern Time, except for four counties and two cities, which observe Central Time.
This is a list representing time zones by country. Countries are ranked by total number of time zones on their territory. Time zones of a country include that of dependent territories (except Antarctic claims ). France, including its overseas territories, has the most time zones with 12 (13 including its claim in Antarctica ).
