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This is a list representing time zones by country. Countries are ranked by total number of time zones on their territory. Time zones of a country include that of dependent territories (except Antarctic claims).
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.
Greenwich Mean Time (GMT; UTC+00:00) was adopted as the standard time of capital Lagos in the Southern Nigeria Protectorate—a protectorate of the British Empire—on 1 July 1905, however Lagos reverted to local mean time on 1 July 1908. [1] [2] The Southern and Northern Nigeria Protectorates were amalgamated to form the Colony and ...
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.
a The islands of Cape Verde and Canary Islands are to the west of the African mainland. b Mauritius and the Seychelles are to the east and north-east of Madagascar respectively.
Instituted in 1869, the Allegheny Observatory's service is believed to have been the first regular and systematic system of time distribution to railroads and cities as well as the origin of the modern standard time system. [1] By 1870 the Allegheny Time service extended over 2,500 miles with 300 telegraph offices receiving time signals. [2]
The term "GMT" is also used as one of the names for the time zone UTC+00:00 and, [2] in UK law, is the basis for civil time in the United Kingdom. [ 3 ] [ a ] Because of Earth's uneven angular velocity in its elliptical orbit and its axial tilt , noon (12:00:00) GMT is rarely the exact moment the Sun crosses the Greenwich Meridian [ b ] and ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 10 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 ...