You need to keep in mind that this time zone is an identifier for a time offset that is 0 hour ahead of the UTC time zone
This time pattern is maintained using highly accurate atomic clocks matched to the Earth's rotation.
In this section, you will learn key facts about this time zone and stay well informed.
Please be aware that Daylight Saving Time
(DST) is not used in this time zone.
During the summer, clocks go forward one hour to the UTC+1
offset and British Summer Time
The name of the clock that shows Greenwich Mean Time at the Royal Observatory in Greenwich, London, UK, is Shepherd Gate Clock.
About This Time Pattern
This time zone is a time offset that adds 0 hour to Coordinated Universal Time
In the map above we highlight the entire region covered by this time zone.
Its main cities and territories are:
Territories observing the time zone are primarily in Europe, Africa, North America and Antarctica.
This time zone is used in the following countries:
In Portugal, this time zone is used throughout the country, except for the Azores.
In Spain, the current GMT Time is present in the territory of Canary Islands.
In Denmark, this time zone is present in the territories of Faroe Islands and Greenland.
In the United Kingdom, the current GMT Time is present in the territories of Isle of Man, England
, Wales, Scotland, Northern Ireland.
In Spain, this time zone is present in the territory of Troll Research Station (Antarctica).
During the experiment of 1968 to 1971, when the British Isles did not revert to Greenwich Mean Time during the winter, the all-year British Summer Time was called British Standard Time (BST).
Synchronisation of the chronometer on GMT did not affect shipboard time, which was still solar time.
But this practice, combined with mariners from other nations drawing from Nevil Maskelyne's method of lunar distances based on observations at Greenwich, led to GMT being used worldwide as a standard time independent of location.