Map of time zones in usa

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You are free to use our US time zone map for educational and commercial uses. Attribution is required. How to attribute? This US time zone map displays the six designated time zones of the United States. Specifically, the time zones in America are:.

Map of time zones in usa

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. Time zones are defined as one or two offsets from Coordinated Universal Time UTC , and if two offsets are used the days when the offset changes. Some time zones switch between offsets throughout the year due to daylight saving time DST. Areas of extreme latitude are more likely to use DST. DST is usually used for about half of the year, typically by adding one hour to local time during spring and summer. When DST is in effect, approximately during spring and summer, their UTC offset is increased by one hour except for Lord Howe Island , where it is increased by 30 minutes. The apparent position of the Sun in the sky, and thus solar time , varies by location due to the spherical shape of the Earth. This variation corresponds to four minutes of time for every degree of longitude , so for example when it is solar noon in London , it is about 10 minutes before solar noon in Bristol , which is about 2. The Royal Observatory, Greenwich , founded in , established Greenwich Mean Time GMT , the mean solar time at that location, as an aid to mariners to determine longitude at sea, providing a standard reference time while each location in England kept a different time. In the 19th century, as transportation and telecommunications improved, it became increasingly inconvenient for each location to observe its own solar time. Around August 23, , time signals were first transmitted by telegraph from the Royal Observatory. Some British clocks from this period have two minute hands, one for the local time and one for GMT.

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There are 9 time zones by law in the USA and its dependencies. However, adding the time zones of 2 uninhabited US territories, Howland Island and Baker Island , brings the total count to 11 time zones. The contiguous US has 4 standard time zones. In addition, Alaska , Hawaii , and 5 US dependencies all have their own time zones. Since Howland Island and Baker Island constitute the world's westernmost landmasses in relation to the International Date Line , making them the last places on Earth where any date exists, they are sometimes assigned a theoretical 12th time zone called Anywhere on Earth AoE. The time zones in the contiguous US are often referred to by their generic name, without making a difference between standard time and Daylight Saving Time designations. In practice, this means that the local time in these time zones changes when DST begins and ends. Note: Local time in these time zones changes when Daylight Saving Time begins and ends. The above time zones are used during other parts of the year.

Map of time zones in usa

Pacific time. Fri Mar Mountain time. Central time. Eastern time.

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Smithsonian Magazine. Archived from the original on April 4, Retrieved April 18, This variation corresponds to four minutes of time for every degree of longitude , so for example when it is solar noon in London , it is about 10 minutes before solar noon in Bristol , which is about 2. One reason to draw time zone boundaries far to the west of their ideal meridians is to allow the more efficient use of afternoon sunlight. 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. While most application software will use the underlying operating system for time zone information, the Java Platform , from version 1. Arizona Colorado Montana. Main article: Unix time. Allen, the editor of the Traveler's Official Railway Guide. DST never observed.

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Calendar systems nowadays usually tie their time stamps to UTC, and show them differently on computers that are in different time zones. I'm receiving webinar times time to attend the class. Google Calendar Help as of Oct. The use of local time for time-stamping records is not recommended for time zones that implement daylight saving time because once a year there is a one-hour period when local times are ambiguous. Archived from the original on September 27, Calendaring software must also deal with daylight saving time DST. You are free to use our US time zone map for educational and commercial uses. Saturday, November 21, ". This variation corresponds to four minutes of time for every degree of longitude , so for example when it is solar noon in London , it is about 10 minutes before solar noon in Bristol , which is about 2. California Nevada Washington. Norfolk Island. Florida Indiana Kentucky.