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This map was made by combining version 2023d with OpenStreetMap data, using open source software. [ 1 ] This is a list of time zones from release 2025a of the tz database .
Greenwich Mean Time (GMT) is the local mean time at the Royal Observatory in Greenwich, London, counted 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 particular time unless a context is given.
5: UTC−04:00 – Pituffik Space Base in Greenland UTC−03:00 – Most of Greenland, including inhabited south coast and west coast UTC−01:00 – Ittoqqortoormiit and surrounding area in Greenland's Tunu county UTC+00:00 – Danmarkshavn weather station and surrounding area in Greenland's Tunu county, Faroe Islands
Time zones of the world. 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.
The line down the middle of this 1911 map is the prime meridian, shown passing through Greenwich. Saxavord and Balta at the top of the map are in the Shetland Islands, the most northerly parts of Scotland and the United Kingdom. Shetland lies 1° W of the prime meridian.
Rand McNally Standard Map of the United States, 1921, showing boundaries different from today See also: Standard time in the United States Before the adoption of four standard time zones for the continental United States, many towns and cities set their clocks to noon when the sun passed their local meridian , pre-corrected for the equation of ...
This is a list of the UTC time offsets, showing the difference in hours and minutes from Coordinated Universal Time (UTC), from the westernmost (−12:00) to the easternmost (+14:00).
Pale colours: Standard time observed all year Dark colours: Summer time observed Europe spans seven primary time zones (from UTC−01:00 to UTC+05:00), excluding summer time offsets (five of them can be seen on the map, with one further-western zone containing the Azores, and one further-eastern zone spanning the Ural regions of Russia and European part of Kazakhstan).