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Greenwich Mean Time (GMT) is the local mean time at the Royal Observatory in Greenwich, London, counted from midnight. It is also used as a name for the time zone UTC+00:00 and the basis for civil time in the United Kingdom.
Learn how different countries use various conventions for date and time formats, both written and spoken. Compare the 24-hour and 12-hour clocks, the ISO 8601 standard, and the local variations in punctuation, spacing, and calendar systems.
The Doomsday Clock is a metaphor for the likelihood of a human-made global catastrophe, set by the Bulletin of the Atomic Scientists based on various threats. The clock was first set to seven minutes to midnight in 1947 and has been adjusted 25 times since then, with the most recent setting at 90 seconds in 2023.
British Summer Time (BST) is the name for the period when the UK uses UTC+1 as its time zone, one hour ahead of Greenwich Mean Time (GMT). BST starts on the last Sunday of March and ends on the last Sunday of October, aligned with most of Europe.
Learn about the practice of advancing clocks during part of the year to extend daylight hours in different regions and time zones. See the current and past observance of DST around the world, including start and end dates, shifts and exceptions.
The United Kingdom uses Greenwich Mean Time (UTC) and British Summer Time (UTC+1) as its standard and daylight saving time zones. The web page explains the history, legislation and proposals of time in the UK and its regions.
A world clock is a clock that shows the time for different cities or time zones around the world. Learn about the different forms and features of world clocks, such as analogue, digital, map, and projection displays, and see some examples.
This web page shows the number of time zones in each country and their UTC offsets. France has the most time zones with 12, followed by Russia with 11, and the United States with 10.