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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).
Standard Time (SDT) and Daylight Saving Time (DST) offsets from UTC in hours and minutes. For zones in which Daylight Saving is not observed, the DST offset shown in this table is a simple duplication of the SDT offset.
In this case, instead of giving a time zone, an offset (e.g. -30, 45, etc.) can also be given; This exact offset will then be used as the output (this functionality is merely included for template compatibility).
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.
It was based on longitude 172°30′ east of Greenwich, that is 11 hours 30 minutes ahead of GMT. This standard was known as New Zealand Mean Time. [10] 1913 time zone map of the United States, showing boundaries very different from today. Timekeeping on North American railroads in the 19th century was complex. Each railroad used its own ...
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 ...
Period in use 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
This is an accepted version of this page This is the latest accepted revision, reviewed on 19 February 2025. Primary time standard "UTC" redirects here. For the time zone between UTC−1 and UTC+1, see UTC+00:00. For other uses, see UTC (disambiguation). It has been suggested that UTC offset be merged into this article. (Discuss) Proposed since December 2024. Current time zones Coordinated ...