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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]
Map of U.S. time zones with new CST and EST areas displayed. Some U.S. time zones, such as the Samoa Time Zone, are not on this map. This is a list of the time offsets by U.S. states, federal district, and territories. For more about the time zones of the U.S. see time in the United States. Most states are entirely contained within one time zone.
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 ...
UTC−08:00 – Pacific Time zone: the Pacific coast states, the Idaho Panhandle and most of Nevada and Oregon UTC−07:00 – Mountain Time zone: most of Idaho, part of Oregon, and the Mountain states plus western parts of some adjacent states UTC−06:00 – Central Time zone: a large area spanning from the Gulf Coast to the Great Lakes
These are rule lines for the standard United States daylight saving time rules, rule lines for the daylight saving time rules in effect in the US Eastern Time Zone (called "NYC" as New York City is the city representing that zone) in some years, and zone lines for the America/New_York timezone, as of release version tzdata2011n of the 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.
The military time zone system ensures clear communication in a concise manner, and avoids confusion when coordinating across time zones. The CCEB , representing the armed forces of Australia, Canada, New Zealand, the United Kingdom, and the United States, publishes the military time zone system as the ACP 121 standard. [ 1 ]
Operators of the new railroad lines needed a new time plan that would offer a uniform train schedule for departures and arrivals. Four standard time zones for the continental United States were introduced at noon on November 18, 1883, in Chicago, IL , when the telegraph lines transmitted time signals to all major cities.