Time Zones Time now

Use this page as a guide to set time zones for different places.

Use this page as a guide to set time zones for different places. Timezone is a place on Earth that uses a single time. The Greenwich Mean Time (GMT) is the mean sun time at the Royal Observatory in Greenwich, London, which is at a latitude of zerodegree.

While GMT and unTC substantially mirror the same time, GMT is a time domain, while unTC is a time domain that is used as a base for civilian time zones worldwide.1 Other time domains are calculated by using an GMT offsets and are usually expressed by "UTC" followed by an offsets, e.g. UTC-5, UTC+8, etc.

A lot of nations or areas, especially in Europe and North America, use standard time ( "summer time") to save electricity. A typical part of this is to shift the time by one extra hour in early spring by one extra hour and " turn back " the time in fall.

In certain areas, the handling of time with the changing of season can better synchronise working time with the periods of dawn and dusk. It is less important for higher areas (where dawn and dusk are clearly deducted from normal working time, regardless of time manipulation) and for sites close to the river eq (where there is little fluctuation in natural light throughout the year).

There is no change in either GMT or either GMT or either channel with respect to daylight saving time, although some GMT-using nations change between time zones during their daylight saving time, such as the United Kingdom, which uses British daylight saving time during the daylight saving time. Below is a chart showing the default time zones around the globe.

Timezone -- from Eric Weisstein's world of astronomy

There are a number of time zones in the whole wide range of the globe. Broadly said, there are 24 time zones separated by 15° in degrees of longitudes. However, in practice, due to geographical and policy reasons, the borders of time zones are more cumbersome. Additionally, some time zones are compensated by an uneven number of half an hour from the Greenwich and US time zones.

Inside the boundaries of each time zones, the hours and min of the current session are considered equal. Timezones remove the issue that the location of midday (defined according to the altitude of the sun) for cities with slightly different degrees of longitude takes place at a different time, so that the watches of each city differ from those of neighbouring cities by a few moments.

The definition of time zones means that clocks only have to be adapted in one hour increments when exceeding a time limit, as compared to a continuous east-west trip. Timezones are usually indicated by the number of times they differ from the average Greenwich Mean Time. Greenwich, England is known as the 0 of meridian and is the centre of the Greenwich time zones in relation to which other time zones are normally referred to.

The U.S. Eastern Standard Time (EST) for example is UT - 5 hrs, the U.S. Central Time (CST) is UT - 6 hrs, the U.S. Mountain Time (MST) is UT - 7 hrs, and the U.S. Pacific Time (PST) is UT - 8 hrs. Nearly all time zones differ from the GMT by a whole number of consecutive hour, but there is one number of which the most popular in North America is Newfoundland, which differs by an uneven number of half an hour.

Further are Iran, Afghanistan, India, Nepal, Myanmar and Australia. In the following chart, the system converts UT to summer and normal time in the USA. As a time zone-related construction, the 180° meridian's date line is the center of the time zoning 12 hour distance from Greenwich.