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Time (GMT) Information

Time (GMT) Information

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Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London, reckoned from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon;[1] as a consequence, it cannot be used to specify a precise time unless a context is given.

The time convention begins with Universal Coordinated Time (UTC) which is also commonly referred to as Greenwich Mean Time (GMT) being located at the Greenwich meridian. This line runs through the United Kingdom, France, Spain, Algeria, Mali and Ghana in Africa.

The world time zone map uses a repeating color scheme to designate the different standard time zones observed in each country. Most countries do not adjust their time zone observance and when they do it most likely involves small boundary changes or changes in the observance of daylight saving time. The world time zone map indicates the standard time zones actually observed. In theory time zones are based on the division of the world into twenty four time zones of 15 degrees longitude each. The time convention begins with Universal Coordinated Time (UTC) which is also commonly referred to as Greenwich Mean Time (GMT) being located at the Greenwich meridian. This line runs through the United Kingdom, France, Spain, Algeria, Mali and Ghana in Africa. The Greenwich meridian time zone is 7 1/2 degrees east and 7 1/2 degrees west of zero degrees longitude. Time zones to the east of the Greenwich meridian are later and time zones to the west of the Greenwich meridian are earlier. To see more detail view our larger format world time zone map.

What is Greenwich Mean Time (GMT)?

View exact Greenwich Mean Time

The history of GMT

Digital clock showing GMT

GMT (Daylight Saving Time never applies)

14:56:16June 6, 2020GMT +00:00


Did you know?

The name of the clock that shows Greenwich Mean Time at the Royal Observatory in Greenwich, London, UK, is Shepherd Gate Clock

GMT is used as Standard Time in the UK and several other countries and is also a time zone

Offsets or time differences are generally written as UTC/GMT plus or minus a number of hours.

The definition

Greenwich Mean Time or GMT is clock time at the Royal Observatory in Greenwich, London. It is the same all year round and is not affected by Summer Time (Daylight Saving Time) clock changes.

When the sun is at its highest point exactly above the Prime Meridian, it is 1200 noon at Greenwich.

Check out the GMT timestamp to see how accurate your computer time is.

GMT is also a time zone, used by the United Kingdom of Great Britain and Northern Ireland (UK) when Daylight Saving Time is not in use, from October to March.

GMT was originally set up to aid naval navigation when travel around the globe started to open up with the discovery of the “New World” (America) in the fifteenth century.

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