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Time zone abbreviations for both Standard Time and Daylight Saving Time are shown exactly as they appear in the database. See strftime and its "%Z" field. Some of zone records use 3 or 4 letter abbreviations that are tied to physical time zones, others use numeric UTC offsets.
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...
In theory, ships are supposed to adopt the standard time of a country if they are within its territorial waters within 12 nautical miles (14 mi; 22 km) of land, then revert to international time zones (15° wide pole-to-pole gores) as soon as they leave. In practice, ships use these time zones only for radio communication and similar purposes.
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.
Canada (Pacific Time Zone) [10] British Columbia. Except Northern Rockies Regional Municipality, Peace River Regional District, and the south-eastern communities of Cranbrook, Golden and Invermere [11] France [12] Clipperton Island; Mexico. Baja California [13] United Kingdom. Pitcairn Islands; United States (Pacific Time Zone) [14] California ...
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.
GMT−15:56 (in Manila) local mean time: GMT−16:12 (in Balabac, the westernmost island) GMT−15:34 (in Davao Oriental, the easternmost area) Tuesday, December 31, 1844: The day that never occurred as ordered by the Spanish Governor-General Narciso Claveria to add 24 hours to the local mean time. [13] Time Zone change [note 3] Wednesday ...
Since 2012, DST was observed from the last Friday of March to the last Friday of October; however, the days of time switches varied year-to-year between 1986–2011. On 4 October 2022, Syria abolished DST, while changing the country's time zone to what used to be summer time (UTC+03:00), effectively scrapping winter time. [11]