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Time offset from GMT/UTC Name of time; Saturday, March 16, 1521 (Julian Calendar) – Monday, December 30, 1844 (Gregorian Calendar) 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
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.
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).
GMT: Greenwich Mean Time: UTC+00:00: GST: South Georgia and the South Sandwich Islands Time: UTC−02:00: GST: Gulf Standard Time: UTC+04:00: GYT: Guyana Time: UTC−04:00: HDT: Hawaii–Aleutian Daylight Time: UTC−09:00: HAEC: Heure Avancée d'Europe Centrale French-language name for CEST UTC+02:00: HST: Hawaii–Aleutian Standard Time: UTC ...
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.
Pale colours: Standard time observed all year Dark colours: Summer time observed During British Summer Time (BST), civil time in the United Kingdom is advanced one hour forward of Greenwich Mean Time (GMT), in effect changing the time zone from UTC+00:00 to UTC+01:00, so that mornings have one hour less daylight, and evenings one hour more.
To determine "longitude by chronometer," a navigator requires a chronometer set to the local time at the Prime Meridian. Local time at the Prime Meridian has historically been called Greenwich Mean Time (GMT), but now, due to international sensitivities, has been renamed as Coordinated Universal Time (UTC), and is known colloquially as "zulu time".
The numeric zone description or "plus and minus system" indicates the correction which must be applied to the time as expressed in order to convert to UTC. For example, the zone description for the Romeo time zone is +5. Therefore, adding 5 hours to 0600R produces the time in UTC, 1100Z. [1]