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Learn about the history, regulation and current time zones of the U.S. and its territories. See a map of the nine standard time zones and their offsets from UTC, as well as the regions that observe daylight saving time.
The Eastern Time Zone is a time zone covering parts of the US, Canada, Mexico, and some Caribbean islands. It uses Eastern Standard Time (EST) or Eastern Daylight Time (EDT) depending on daylight saving time.
Learn about the time zone that covers parts of North America, Central America and some Caribbean islands. Find out how it changes between Central Standard Time (CST) and Central Daylight Time (CDT) depending on the season and location.
Find out the time difference between states and territories in the U.S. based on their time zones and daylight saving time observance. See a map and a list of the time offsets for each region, from UTC−10 to UTC+10.
The Atlantic Time Zone is a geographical region that keeps standard time by subtracting four hours from UTC, resulting in UTC−04:00. Some parts of the zone observe daylight saving time, referred to as Atlantic Daylight Time (ADT), by moving their clocks forward one hour to UTC−03:00.
A time zone is an area that observes a uniform standard time for legal, commercial and social purposes. Learn how time zones are defined by offsets from UTC, which locations use daylight saving time, and see a map of the world's time zones.
The Pacific Time Zone (PT) is a time zone in western North America, with UTC−08:00 or UTC−07:00 depending on daylight saving time. It covers parts of Canada, the United States, and Mexico, and has different names and dates for daylight time changes.
Learn how standard time in time zones was established in the U.S. in 1883 by railroad executives, and how it evolved over time with federal laws and daylight saving time. The web page does not answer the query directly, but provides historical context and references.
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