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 World Time and Clocks - Clocks are found all over the world and all tell you the same thing wherever you live. We've gathered information about world time and clocks. Things like daylight savings time, world time zones, atomic clocks & more.
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Earth is split up into a number of World time zones. Most time zones are exactly one hour apart, and by convention compute their local time as an offset from Greenwich Mean Time.
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World Time Zones
In the latter part of the 19th century, a variety of meridians were used for longitudinal reference by various countries.
For a number of reasons, the Greenwich meridian was the most popular of these. At least one factor in this popularity
was the reputation for reliability and correctness of the Greenwich Observatory's publications of navigational data.
It became clear that shipping would benefit substantially from the establishment of a single "prime" meridian, and the
subject was finally resolved in 1884 at a conference held in Washington, where the meridian passing through Greenwich was
adopted as the initial or prime meridian for longitude and timekeeping. Given a 24 hour day and 360 degrees of longitude
around the earth, it is obvious that the world's 24 time zones have to be 15 degrees wide, on average. The individual
zone boundaries are not straight, however, because they have been adjusted for the convenience and desires of local
populations. NIST
So, the Earth is split up into a number of time zones. Most time zones are exactly one hour apart, and by convention
compute their local time as an offset from Greenwich Mean Time (GMT).
Greenwich, England has been the home of Greenwich Mean Time (GMT) since 1884. GMT is measured from the Greenwich
Meridian Line at the Royal Observatory in Greenwich. It is the place from where all time zones are measured. World Time Zones
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The most relevant links we could find, placed here free
 The World Time Server
- Current time around the world, information, time converter, meeting planner and more. www.worldtimeserver.com
NIST
- World Time Scales, an article about time zones. physics.nist.gov
Wikipedia
- More about world time zones and a list of time zones. en.wikipedia.org
Greenwich2000®
- More about the time zones of the World. wwp.greenwichmeantime.com
World Time Zones
- The current time anywhere in the world. www.worldtimezones.com
There are 25 integer time zones from -12 through 0 (GMT) to +12. Each one is 15° of Longitude as measured East and
West from the Prime Meridian of the World at Greenwich, England. Some countries have adopted non-standard world time
zones, usually 30 minutes offset (Iran, Afghanistan, India, Cocos Islands, Lord Howe Island, Norfolk Island, Rawaki Islands, Darwin
and Adelaide in Australia, and Canadian island of Newfoundland).
There are variations of the definitions of time zone which generally fall into two meanings: a time zone can represent a
region where the local time is some fixed offset from a global reference (usually UTC), or a time zone can represent a
region throughout which the local time is always consistent even though the offset may fluctuate seasonally. Wikipedia
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World Time Zones
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World time zone map
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Site written by Edoardo Salazar