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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. However, some states are in two time zones, due to geographical, socio-political or economic reasons.
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 ...
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 ).
42-60000. GNIS feature ID. 1215531  Website. www.phila.gov. Philadelphia ( / fɪlɑːdɛlfiːɑː / ( listen) FILL-ah-dəl-FEE-ah ), often called Philly, is the largest city in the Commonwealth of Pennsylvania  and the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City.
The history of standard time in the United States began November 18, 1883, when United States and Canadian railroads instituted standard time in time zones.Before then, time of day was a local matter, and most cities and towns used some form of local solar time, maintained by some well-known clock (for example, on a church steeple or in a jeweler's window).
Region 1: Northeast. Division 1: New England ( Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont) Division 2: Middle Atlantic ( New Jersey, New York, and Pennsylvania) Region 2: Midwest (Before June 1984, the Midwest Region was designated as the North Central Region .) 
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.